{"title":"Preamp Tubes","description":"\u003ctable class=\"collection-table\" style=\"width: 100%; border:none!important;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/tube-basics-and-frequently-asked-questions\" target=\"_blank\"\u003eTube Basics and FAQ\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/grading-matching\" target=\"_blank\"\u003eGrading and Matching\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/vacuum-tube-warranty-information\" target=\"_blank\"\u003eTube Warranty \u0026amp; Return Policy\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/cryogenically-treated-vacuum-tubes\" target=\"_blank\"\u003eCryogenic Treating\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/test-equipment\" target=\"_blank\"\u003eTube Testing Equipment\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/why-we-dont-sell-certain-brands\" target=\"_blank\"\u003eWhy We Don't Sell Certain Brands\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cstyle type=\"text\/css\"\u003e\u003c!--td {border: none;}br {mso-data-placement:same-cell;}--\u003e\u003c\/style\u003e","products":[{"product_id":"electro-harmonix-6sn7","title":"Electro-Harmonix 6SN7","description":"\u003ch1\u003e\n\u003cstrong\u003eElectro-Harmonix 6SN7\u003c\/strong\u003e \u003c\/h1\u003e\n\u003cp\u003eCurrent production tube made by New Sensor in Russia. Great tube. These tubes have been testing really low in noise and microphony, so if you have a preamp that is very sensitive, this may be the way to go.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlatinum grade -\u003c\/strong\u003e The best of the best. Lowest noise and microphony with the tightest triode balance we have available. This is typically 10% or tighter, but may be higher depending on available stock.\u003cstrong\u003e \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGold grade -\u003c\/strong\u003e Low noise and microphonics with a triode balance typically between 15% and 20%, but may be higher depending on available stock.\u003cstrong\u003e \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDriver grade -\u003c\/strong\u003e Lowest noise but not the lowest in microphony. Triode balance will be similar to Gold grade.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cem\u003eThis grade is only suitable for use in the driver stage of an amplifier, or the output\/buffer stage of a DAC or CD Player.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/grading-and-matching-small-signal-tubes\" target=\"_blank\" rel=\"noopener noreferrer\"\u003e\u003cstrong\u003eClick here for a more in depth discussion on how we grade tubes.\u003cbr\u003e\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eLogo quality may vary from picture above. Price includes matching in any quantity you need at \u003cstrong\u003eno extra charge.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Electro-Harmonix","offers":[{"title":"Kevin's Stash \/ No Cryo","offer_id":29530429915196,"sku":"EH 6SN7 KS","price":53.95,"currency_code":"USD","in_stock":false},{"title":"Kevin's Stash \/ Yes Cryo","offer_id":29530429980732,"sku":"EH 6SN7 KS C","price":61.95,"currency_code":"USD","in_stock":false},{"title":"Platinum Grade \/ No Cryo","offer_id":21829018181,"sku":"EH 6SN7 P","price":43.95,"currency_code":"USD","in_stock":false},{"title":"Platinum Grade \/ Yes Cryo","offer_id":21829018117,"sku":"EH 6SN7 P C","price":51.95,"currency_code":"USD","in_stock":false},{"title":"Gold Grade \/ No Cryo","offer_id":41664338559160,"sku":"EH 6SN7 G","price":33.95,"currency_code":"USD","in_stock":false},{"title":"Gold Grade \/ Yes Cryo","offer_id":41664338591928,"sku":"EH 6SN7 G C","price":41.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/c3f9134cde793f0993469e2a867a3f69.jpg?v=1741632765"},{"product_id":"russian-6h30pi","title":"Sovtek 6H30Pi","description":"\u003ch1\u003eSovtek 6H30Pi\u003c\/h1\u003e\n\u003cp\u003eThere are two types of 6H30 tubes currently being produced. The Sovtek brand which have the chrome pins (listed here), and the Electro Harmonix Gold pin. They are the same tube from the same factory. Don’t get your panties in a bunch over which is better, as the gold plating is laid over the chrome plating. They are both terrific. What is most important is how they test.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eYou guys already know that Upscale Audio is the only place that the Audio Research factory people give a thumbs up to\u003c\/strong\u003e. That’s because we actually have our power tubes matched properly and have the highest Gm, and that \u003cstrong\u003eevery small signal tube like the 6H30 is not just measured, but listened to in a special phono stage test circuit by using headphones.\u003c\/strong\u003e That, my friends, is the only way to get the blackest blacks in your system.\u003c\/p\u003e\n\u003cp\u003eWe deal with some fairly picky customers that want to make sure that their expensive ARC preamps, phono stages, and amps are as close to perfection as possible. For that customer we have 6H30’s in a grade called “ARC Select”.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis grade has four distinguishing characteristics:\u003c\/strong\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eThe transconductance measurements will be as high as possible, resulting in a tube with the longest life.\u003c\/li\u003e\n\u003cli\u003eInternal balance between the two triodes of the tube will be as tight as possible, within 15% (triode balance on a 6H30 can easily vary by 50%)\u003c\/li\u003e\n\u003cli\u003eThe microphony will be the absolute lowest possible, tested in a moving coil phonostage test circuit with 60dB of gain.\u003c\/li\u003e\n\u003cli\u003eThe noise will be the absolute lowest possible while being pushed in the same moving coil phonstage test circuit.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003ePlatinum grade will be a fine tube for most people.\u003c\/strong\u003e\u003c\/em\u003e If you want to assure everything in your system is PERFECT, then use ARC Select. Remember that the tubes are the actual amplifying device you are listening to. They are everything. More than those cables you bought, or that power conditioner. That’s why Upscale Audio is the place that ARC owner’s go. Nobody does what we do.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePlease note: There are a finite number of ARC Select grade available.\u003c\/b\u003e If the website does not let you place your order, call us at 909-931-9686 and we can put you on a waiting list.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlatinum grade -\u003c\/strong\u003e The best of the best. Lowest noise and microphony with the tightest triode balance we have available. This is typically 10% or tighter, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGold grade -\u003c\/strong\u003e Low noise and microphonics with a triode balance typically between 15% and 20%, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis tube is not a replacement for 6922 or any other tube type.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003ca href=\"\/grading-and-matching-small-signal-tubes\" rel=\"noopener noreferrer\" target=\"_blank\"\u003e\u003cstrong\u003eClick here for a more in depth discussion on how we grade tubes.\u003c\/strong\u003e\u003c\/a\u003e \u003c\/strong\u003eLabel quality may vary from picture above. Prices includes matching in any quantity you need at \u003cstrong\u003eno extra charge.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Sovtek","offers":[{"title":"Gold Grade \/ No Cryo","offer_id":21829851397,"sku":"SOV 6H30 G","price":53.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ Yes Cryo","offer_id":21829851333,"sku":"SOV 6H30 G C","price":61.95,"currency_code":"USD","in_stock":true},{"title":"Platinum Grade \/ No Cryo","offer_id":21829851525,"sku":"SOV 6H30 P","price":63.95,"currency_code":"USD","in_stock":true},{"title":"Platinum Grade \/ Yes Cryo","offer_id":21829851461,"sku":"SOV 6H30 P C","price":71.95,"currency_code":"USD","in_stock":true},{"title":"ARC Select \/ No Cryo","offer_id":21829851653,"sku":"SOV 6H30 ARS","price":83.95,"currency_code":"USD","in_stock":true},{"title":"ARC Select \/ Yes Cryo","offer_id":21829851589,"sku":"SOV 6H30 ARS C","price":101.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/bef5a94dc8715908fa356e14732092c1.jpg?v=1741632707"},{"product_id":"gold-lion-ecc83-b759","title":"Gold Lion ECC83 \/ B759 \/ 12AX7","description":"\u003ch1\u003eGold Lion ECC83 \/ 12AX7\u003c\/h1\u003e\nLet's face it... NOS 12AX7's are getting scarce. When that happens, the price goes up. The good news? The quality of current production 12AX7's is getting better and better. The latest Russian re-issue is a perfect example. These Gold Lion 12AX7 re-issues sound incredible: A full, glorious midrange with great texture and liquid detail, extended yet controlled highs, tight bass.\n\u003cp\u003eVery quiet and low in microphonics. Due to the larger plate structure, if you're the kind of guy who likes to thwack their tubes with their fingernails... these will likely reward you with a loud \"PING!\" through the speakers. The solution? Don't thwack them with your fingernails!\u003c\/p\u003e\n\u003cdiv align=\"center\"\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/sCu_zGckuvY\" frameborder=\"0\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cp\u003eThese tubes tested extremely low in noise and microphonics across the board, so we do not have any Driver\/Buffer Grade.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlatinum grade -\u003c\/strong\u003e The best of the best. Lowest noise and microphony with the tightest triode balance we have available. This is typically 10% or tighter, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGold grade -\u003c\/strong\u003e Low noise and microphonics with a triode balance typically between 15% and 20%, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/upscaleaudio.com\/pages\/grading-matching\" target=\"_blank\"\u003e\u003cstrong\u003eClick here for a more in depth discussion on how we grade tubes.\u003cbr\u003e\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003ePrice includes matching in any quantity you need at \u003cstrong\u003eno extra charge.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Gold Lion","offers":[{"title":"Platinum Grade \/ No Cryo","offer_id":21830120005,"sku":"GOLDLION12AX7 P","price":79.95,"currency_code":"USD","in_stock":true},{"title":"Platinum Grade \/ Yes Cryo","offer_id":21830119941,"sku":"GOLDLION12AX7 P C","price":87.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ No Cryo","offer_id":41659594899640,"sku":"GOLDLION12AX7 G","price":69.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ Yes Cryo","offer_id":41659594932408,"sku":"GOLDLION12AX7 G C","price":77.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ No Cryo","offer_id":29530422509628,"sku":"GOLDLION12AX7 KS","price":89.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ Yes Cryo","offer_id":29530422542396,"sku":"GOLDLION12AX7 KS C","price":97.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/f5d4de2dd4e47e30f56f67395842edd2.jpg?v=1741632688"},{"product_id":"gold-lion-ecc82-b749","title":"Gold Lion ECC82 \/ B749 \/ 12AU7","description":"\u003ch1\u003eGold Lion ECC82 \/ 12AU7\u003c\/h1\u003e\nIncredible current production re-issue of the legendary Genalex. Very low noise and microphonics. These tubes have beautiful and dynamic midrange texture, airy highs, controlled, tight bass. Excellent resolution.\n\u003cp\u003eThese tubes tested extremely low in noise and microphonics across the board, so we do not have any Driver Grade.\u003c\/p\u003e\n\u003cdiv align=\"center\"\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/HS2tX1gqzqU\" frameborder=\"0\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003ePlatinum grade -\u003c\/strong\u003e The best of the best. Lowest noise and microphony with the tightest triode balance we have available. This is typically 10% or tighter, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGold grade -\u003c\/strong\u003e Low noise and microphonics with a triode balance typically between 15% and 20%, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/grading-and-matching-small-signal-tubes\" target=\"_blank\"\u003e\u003cstrong\u003eClick here for a more in depth discussion on how we grade tubes.\u003cbr\u003e\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003ePrice includes matching in any quantity you need at \u003cstrong\u003eno extra charge.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Gold Lion","offers":[{"title":"Platinum Grade \/ No Cryo","offer_id":21830123077,"sku":"GOLDLION12AU7 P","price":79.95,"currency_code":"USD","in_stock":true},{"title":"Platinum Grade \/ Yes Cryo","offer_id":21830123013,"sku":"GOLDLION12AU7 P C","price":87.95,"currency_code":"USD","in_stock":false},{"title":"Gold Grade \/ No Cryo","offer_id":41659639791800,"sku":"GOLDLION12AU7 G","price":69.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ Yes Cryo","offer_id":41659639824568,"sku":"GOLDLION12AU7 G C","price":77.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ No Cryo","offer_id":29530422444092,"sku":"GOLDLION12AU7 KS","price":89.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ Yes Cryo","offer_id":29530422476860,"sku":"GOLDLION12AU7 KS C","price":97.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/2144cef5f6e5a118eb4f46a665b870f2.jpg?v=1583876942"},{"product_id":"tung-sol-6sn7gtb","title":"Tung-Sol 6SN7GTB","description":"\u003ch1\u003e\u003cstrong\u003eTung-Sol 6SN7GTB \u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003eRe-issue, made by New Sensor in Russia. New Sensor purchased the the Tung-Sol name and trademark, and have begun making new production tubes, using the Tung-Sol brand. These tubes sound great, they stay quiet and have been solid and reliable. Great detail and depth.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlatinum grade -\u003c\/strong\u003e The best of the best. Lowest noise and microphony with the tightest triode balance we have available. This is typically 10% or tighter, but may be higher depending on available stock.\u003cstrong\u003e \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGold grade -\u003c\/strong\u003e Low noise and microphonics with a triode balance typically between 15% and 20%, but may be higher depending on available stock.\u003cstrong\u003e \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDriver\/Buffer grade -\u003c\/strong\u003e Lowest noise but not the lowest in microphony. Triode balance will be similar to Gold grade.\u003cbr\u003e\u003cem\u003eThis grade is only suitable for use in the driver stage of an amplifier, or the output\/buffer stage of a DAC or CD Player.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/grading-and-matching-small-signal-tubes\" target=\"_blank\" rel=\"noopener noreferrer\"\u003e\u003cstrong\u003eClick here for a more in depth discussion on how we grade tubes.\u003cbr\u003e\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003ePrice includes matching in any quantity you need at \u003cstrong\u003eno extra charge.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Tung-Sol","offers":[{"title":"Gold Grade \/ No Cryo","offer_id":21830453573,"sku":"TUNG-SOL 6SN7 G","price":59.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ Yes Cryo","offer_id":21830453445,"sku":"TUNG-SOL 6SN7 G CRYO","price":67.95,"currency_code":"USD","in_stock":true},{"title":"Platinum Grade \/ No Cryo","offer_id":21830453701,"sku":"TUNG-SOL 6SN7 P","price":69.95,"currency_code":"USD","in_stock":true},{"title":"Platinum Grade \/ Yes Cryo","offer_id":21830453637,"sku":"TUNG-SOL 6SN7 P CRYO","price":77.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ No Cryo","offer_id":29530422378556,"sku":"TUNG-SOL 6SN7 KS","price":84.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ Yes Cryo","offer_id":29530422411324,"sku":"TUNG-SOL 6SN7 KS C","price":92.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/33f7029ba22142b39556659fbfb7461e.jpg?v=1741632625"},{"product_id":"electro-harmonix-6922-gold-pin","title":"Electro-Harmonix 6922 Gold Pin","description":"\u003ch1\u003e\u003cstrong\u003eElectro-Harmonix 6922 Gold Pin\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003e\u003cstrong\u003eThis is the gold pin version of the 6H23 Type 2\u003c\/strong\u003e. Like the Type 2s, they are slightly relaxed... just a smidge warmer than the Type 3. If you have a Sonic Frontiers or ARC they will help you have a more palpable midrange. Will also alleviate some of that harshness found in some of those 90's vintage Sovteks with the silverish plates.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlatinum grade -\u003c\/strong\u003e The best of the best. Lowest noise and microphony with the tightest triode balance we have available. This is typically 10% or tighter, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGold grade -\u003c\/strong\u003e Low noise and microphonics with a triode balance typically between 15% and 20%, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDriver\/Buffer grade -\u003c\/strong\u003e Lowest noise but not the lowest in microphony. Triode balance will be similar to Gold grade. \u003cem\u003eThis grade is only suitable for use in the driver stage of an amplifier, or the output\/buffer stage of a DAC or CD Player.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIf you have a preamp or phonostage, you need at least Gold grade.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/grading-and-matching-small-signal-tubes\" target=\"_blank\" rel=\"noopener noreferrer\"\u003e\u003cstrong\u003eClick here for a more in depth discussion on how we grade tubes.\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003ePrice includes matching in any quantity you need at \u003cstrong\u003eno extra charge.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Electro-Harmonix","offers":[{"title":"Platinum Grade \/ No Cryo","offer_id":21830510341,"sku":"EH6922GP P","price":41.95,"currency_code":"USD","in_stock":false},{"title":"Platinum Grade \/ Yes Cryo","offer_id":21830510149,"sku":"EH6922GP P C","price":49.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ No Cryo","offer_id":41664368279736,"sku":"EH6922GP G","price":31.95,"currency_code":"USD","in_stock":false},{"title":"Gold Grade \/ Yes Cryo","offer_id":41664368312504,"sku":"EH6922GP G C","price":39.95,"currency_code":"USD","in_stock":false},{"title":"Kevin's Stash \/ No Cryo","offer_id":29530422181948,"sku":"EH6922GP KS","price":51.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ Yes Cryo","offer_id":29530422214716,"sku":"EH6922GP KS C","price":59.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/747697ae9dc2db6ca2aa95f02a0704ef.jpg?v=1741632618"},{"product_id":"russian-6h30pi-gold-pin","title":"Electro-Harmonix 6H30Pi Gold Pin","description":"\u003ch1\u003eElectro-Harmonix 6H30Pi Gold Pin\u003c\/h1\u003e\n\u003cp\u003eThere are two types of 6H30 tubes currently being produced. The Sovtek brand which have the chrome pins, and the Electro Harmonix Gold pin (listed here). They are the same tube from the same factory. Don’t get your panties in a bunch over which is better, as the gold plating is laid over the chrome plating. They are both terrific. What is most important is how they test. You guys already know that Upscale Audio is the only place that the Audio Research factory people give a thumbs up to. That’s because we actually have our power tubes matched properly and have the highest Gm, and that every small signal tube like the 6H30 is not just measured, but listened to in a special phono stage test circuit by using headphones. That, my friends, is the only way to get the blackest blacks in your system.\u003c\/p\u003e\n\u003cp\u003eWe deal with some fairly picky customers that want to make sure that their expensive ARC preamps, phono stages, and amps are as close to perfection as possible. For that customer we have 6H30’s in a grade called “ARC Select”.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis grade has four distinguishing characteristics:\u003c\/strong\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eThe transconductance measurements will be as high as possible, resulting in a tube with the longest life.\u003c\/li\u003e\n\u003cli\u003eInternal balance between the two triodes of the tube will be as tight as possible, within 15% (triode balance on a 6H30 can easily vary by 50%)\u003c\/li\u003e\n\u003cli\u003eThe microphony will be the absolute lowest possible, tested in a moving coil phonostage test circuit with 60dB of gain.\u003c\/li\u003e\n\u003cli\u003eThe noise will be the absolute lowest possible while being pushed in the same moving coil phonstage test circuit.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003ePlatinum grade will be a fine tube for most people.\u003c\/strong\u003e\u003c\/em\u003e If you want to assure everything in your system is PERFECT, then use ARC Select. Remember that the tubes are the actual amplifying device you are listening to. They are everything. More than those cables you bought, or that power conditioner. That’s why Upscale Audio is the place that ARC owner’s go. Nobody does what we do.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePlease note: There are a finite number of ARC Select grade available.\u003c\/b\u003e If the website does not let you place your order, call us at 909-931-9686 and we can put you on a waiting list.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlatinum grade -\u003c\/strong\u003e The best of the best. Lowest noise and microphony with the tightest triode balance we have available. This is typically 10% or tighter, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGold grade -\u003c\/strong\u003e Low noise and microphonics with a triode balance typically between 15% and 20%, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis tube is not a replacement for 6922 or any other tube type.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003ca href=\"\/grading-and-matching-small-signal-tubes\" rel=\"noopener noreferrer\" target=\"_blank\"\u003e\u003cstrong\u003eClick here for a more in depth discussion on how we grade tubes.\u003c\/strong\u003e\u003c\/a\u003e \u003c\/strong\u003eLabel quality may vary from picture above. Prices includes matching in any quantity you need at \u003cstrong\u003eno extra charge.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Electro-Harmonix","offers":[{"title":"Platinum Grade \/ No Cryo","offer_id":21830513413,"sku":"EH 6H30 P","price":77.95,"currency_code":"USD","in_stock":true},{"title":"Platinum Grade \/ Yes Cryo","offer_id":21830513349,"sku":"EH 6H30 P C","price":85.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ No Cryo","offer_id":21830513285,"sku":"EH 6H30 G","price":67.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ Yes Cryo","offer_id":21830513221,"sku":"EH6H30 G C","price":75.95,"currency_code":"USD","in_stock":true},{"title":"ARC Select \/ No Cryo","offer_id":21830513541,"sku":"EH 6H30 ARS","price":89.95,"currency_code":"USD","in_stock":true},{"title":"ARC Select \/ Yes Cryo","offer_id":21830513477,"sku":"EH 6H30 ARS C","price":97.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/8379e84e42db047d5f97de5caac6d5a7.jpg?v=1741632616"},{"product_id":"tung-sol-12au7w-6189","title":"Tung-Sol 12AU7W \/ 6189","description":"\u003ch1\u003e\u003cstrong\u003eTung-Sol 12AU7W\/6189  \u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003eFrom Russia with love. These current production tubes are quiet, they sound great, and are dependable... giving them Uncle Kevvy's seal of approval. A great choice for any 12AU7\/ECC82 circuit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlatinum grade -\u003c\/strong\u003e The best of the best. Lowest noise and microphony with the tightest triode balance we have available. This is typically 10% or tighter, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGold grade -\u003c\/strong\u003e Low noise and microphonics with a triode balance typically between 15% and 20%, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDriver\/Buffer grade -\u003c\/strong\u003e \u003cem\u003eNot available for this tube.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIf you have a preamp or phonostage, you need at least Gold grade.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/grading-and-matching-small-signal-tubes\" rel=\"noopener noreferrer\" target=\"_blank\"\u003e\u003cstrong\u003eClick here for a more in depth discussion on how we grade tubes.\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003ePrice includes matching in any quantity you need at \u003cstrong\u003eno extra charge.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Tung-Sol","offers":[{"title":"Platinum Grade \/ No Cryo","offer_id":21830519685,"sku":"TUNG-SOL 12AU7 P","price":39.95,"currency_code":"USD","in_stock":true},{"title":"Platinum Grade \/ Yes Cryo","offer_id":25415521936,"sku":"TUNG-SOL 12AU7 P CRYO","price":47.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ No Cryo","offer_id":41659654144184,"sku":"TUNG-SOL 12AU7 G","price":29.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ Yes Cryo","offer_id":41659654176952,"sku":"TUNG-SOL 12AU7 G CRYO","price":37.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ No Cryo","offer_id":29530421461052,"sku":"TUNG-SOL 12AU7 KS","price":49.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ Yes Cryo","offer_id":29530421526588,"sku":"TUNG-SOL 12AU7 KS C","price":57.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/8daecd69dde4f382928bd91ddccf1905.jpg?v=1741632615"},{"product_id":"tung-sol-12ax7-ecc803-s-gold-pin","title":"Tung-Sol 12AX7 \/ ECC803-S Gold Pin","description":"\u003ch1\u003e\n\u003cstrong\u003eTung-Sol 12AX7 \/ ECC83\u003c\/strong\u003e \u003c\/h1\u003e\n\u003cp\u003ePrice of NOS 12AX7s got you down? This new production Tung-Sol 12AX7 made in Russia is the answer! Very low noise and microphonics, but if you've got a really high-gain phonostage the new \u003cstrong\u003eMullard re-issue\u003c\/strong\u003e might be a better choice. Gorgeous mids, beautiful dynamics, and a nice 3D soundstage. If you're looking for a smidge more relaxed top end, give the \u003cstrong\u003eMullard re-issue\u003c\/strong\u003e a try. \u003cstrong\u003ePrice is for a single tube.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eA quick note on this tube:\u003c\/strong\u003e\u003c\/em\u003e The filaments on these Tung-Sols are almost completely encased in the plate structure. So if you don't see them glowing as bright as some of your other 12AX7s... don't sweat it. It's normal for this tube.\u003c\/p\u003e\n\u003cp\u003eThese tubes tested extremely low in noise and microphonics across the board, so we do not have any Driver Grade.\u003c\/p\u003e\n\u003cdiv align=\"center\"\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/O6WEMt4LJj8\" frameborder=\"0\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003ePlatinum grade -\u003c\/strong\u003e The best of the best. Lowest noise and microphony with the tightest triode balance we have available. This is typically 10% or tighter, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGold grade -\u003c\/strong\u003e Low noise and microphonics with a triode balance typically between 15% and 20%, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDriver\/Buffer grade -\u003c\/strong\u003e \u003cem\u003eNot available for this tube.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIf you have a preamp or phonostage, you need at least Gold grade.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/grading-and-matching-small-signal-tubes\" target=\"_blank\" rel=\"noopener noreferrer\"\u003e\u003cstrong\u003eClick here for a more in depth discussion on how we grade tubes.\u003cbr\u003e\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003ePrice includes matching in any quantity you need at \u003cstrong\u003eno extra charge.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Tung-Sol","offers":[{"title":"Platinum Grade \/ No Cryo","offer_id":21830527173,"sku":"TUNG-SOL 12AX7 GP P","price":55.95,"currency_code":"USD","in_stock":true},{"title":"Platinum Grade \/ Yes Cryo","offer_id":21830527109,"sku":"TUNG-SOL 12AX7 GP P C","price":63.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ No Cryo","offer_id":41664357793976,"sku":"TUNG-SOL 12AX7 GP G","price":45.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ Yes Cryo","offer_id":41664357826744,"sku":"TUNG-SOL 12AX7 GP G C","price":53.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ No Cryo","offer_id":29530421362748,"sku":"TUNG-SOL 12AX7 GP KS","price":65.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ Yes Cryo","offer_id":29530421395516,"sku":"TUNG-SOL 12AX7 GP KS C","price":73.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/c83835f4c12fea4e1905c52e264c04cb.jpg?v=1741632613"},{"product_id":"tung-sol-12at7","title":"Tung-Sol 12AT7","description":"\u003ch1\u003e\u003cstrong\u003eTung-Sol 12AT7 \u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003eMade in Russia. A great tube at a great price. Given that small tubes like this last typically between 5,000 and 10,000 hours, it may make sense to spend just a little more and get the vintage Mullard CV4024 made in Great Britain. That tube is selling at a low price right now and will be $150 each at some point.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlatinum grade -\u003c\/strong\u003e The best of the best. Lowest noise and microphony with the tightest triode balance we have available. This is typically 10% or tighter, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGold grade -\u003c\/strong\u003e Low noise and microphonics with a triode balance typically between 15% and 20%, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDriver\/Buffer grade -\u003c\/strong\u003e Lowest noise but not the lowest in microphony. Triode balance will be similar to Gold grade.\u003cbr\u003e\u003cem\u003eThis grade is only suitable for use in the driver stage of an amplifier, or the output\/buffer stage of a DAC or CD Player.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIf you have a preamp or phonostage, you need at least Gold grade.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/grading-and-matching-small-signal-tubes\" target=\"_blank\" rel=\"noopener noreferrer\"\u003e\u003cstrong\u003eClick here for a more in depth discussion on how we grade tubes.\u003cbr\u003e\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"Tung-Sol","offers":[{"title":"Platinum Grade \/ No Cryo","offer_id":21831033285,"sku":"TUNG-SOL 12AT7 P","price":39.95,"currency_code":"USD","in_stock":true},{"title":"Platinum Grade \/ Yes Cryo","offer_id":21831033221,"sku":"TUNG-SOL 12AT7 P C","price":47.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ No Cryo","offer_id":41664401440952,"sku":null,"price":29.95,"currency_code":"USD","in_stock":false},{"title":"Gold Grade \/ Yes Cryo","offer_id":41664401473720,"sku":null,"price":37.95,"currency_code":"USD","in_stock":false},{"title":"Kevin's Stash \/ No Cryo","offer_id":29530420052028,"sku":"TUNG-SOL 12AT7 KS","price":49.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ Yes Cryo","offer_id":29530420084796,"sku":"TUNG-SOL 12AT7 KS C","price":59.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/d18a0700d19149f2152c967f1bd34c9d.jpg?v=1741632499"},{"product_id":"gold-lion-12at7-b739","title":"Gold Lion ECC81 \/ B739 \/ 12AT7","description":"\u003ch1\u003eGold Lion 12AT7 \/ B739\u003c\/h1\u003e\n\u003cp\u003eA fine tube made today in Russia. Gold pins. When we grade them for low noise and microphony they are really good. Very linear with a super top end and bass. But they cannot be compared to the real \u003ca href=\"\/12at7-ecc81-6201-cv4024\/mullard-cv4024-12at7\/\"\u003eMullard CV4024\u003c\/a\u003e made in Great Britain.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlatinum grade -\u003c\/strong\u003e The best of the best. Lowest noise and microphony with the tightest triode balance we have available. This is typically 10% or tighter, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGold grade -\u003c\/strong\u003e Low noise and microphonics with a triode balance typically between 15% and 20%, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDriver\/Buffer grade -\u003c\/strong\u003e Lowest noise but not the lowest in microphony. Triode balance will be similar to Gold grade.\u003cbr\u003e\u003cem\u003eThis grade is only suitable for use in the driver stage of an amplifier, or the output\/buffer stage of a DAC or CD Player.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIf you have a preamp or phonostage, you need at least Gold grade.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/grading-and-matching-small-signal-tubes\" target=\"_blank\"\u003e\u003cstrong\u003eClick here for a more in depth discussion on how we grade tubes.\u003cbr\u003e\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"Gold Lion","offers":[{"title":"Platinum Grade \/ No Cryo","offer_id":21831037829,"sku":"GOLD LION 12AT7 P","price":79.95,"currency_code":"USD","in_stock":true},{"title":"Platinum Grade \/ Yes Cryo","offer_id":21831037701,"sku":"GOLD LION 12AT7 P C","price":87.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ No Cryo","offer_id":41664351830200,"sku":"GOLD LION 12AT7 G","price":69.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ Yes Cryo","offer_id":41664351862968,"sku":"GOLD LION 12AT7 G C","price":77.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ No Cryo","offer_id":29530419986492,"sku":"GOLD LION 12AT7 KS","price":89.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ Yes Cryo","offer_id":29530420019260,"sku":"GOLD LION 12AT7 KS C","price":97.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/6df053eed244f11f85bc39603a3c5814.jpg?v=1741632498"},{"product_id":"tung-sol-5751-gold-pin-reissue-made-in-russia","title":"Tung-Sol New Production 5751 Gold Pin","description":"\u003ch1\u003e\u003cstrong\u003eTung-Sol 5751 Gold Pin \u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003eExcellent tube made in Russia, and a godsend for people needing 5751 at a great price. These used to be branded Electro Harmonix but are now branded Tung-Sol. Platinum grade $24.95 gold grade $19.95\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003eA note on the 5751:\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eSometimes\u003c\/em\u003e a 5751 can be used in lieu of a 12AX7. Some folks (guitar guys typically) that have gear that come equipped with 12AX7's will sub a 5751. They do this specifically because it colors the sound and changes the way their amp performs, as they look for ways to \"distort.\" This is a matter of taste as the 5751 is a lower gain tube than the 12AX7. If someone tells you to use a 5751 because they like it, make sure it's the same piece of gear. A lower gain tube can, depending on the circuit, operate perfectly. However, in some extreme cases, the lower gain can cause high distortion and in some cases not even work properly.\u003c\/p\u003e\n\u003cp\u003e5751 tubes do not have a \"sound\" that is particular to that tube, any more than 12AX7's have a \"sound\". It depends on who made the 5751 and when, the operating condition of the tube, and the circuit it's going into. Any other assumptions or statements about the merits of that tube are silly.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlatinum grade -\u003c\/strong\u003e The best of the best. Lowest noise and microphony with the tightest triode balance we have available. This is typically 10% or tighter, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGold grade -\u003c\/strong\u003e Low noise and microphonics with a triode balance typically between 15% and 20%, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDriver\/Buffer grade -\u003c\/strong\u003e Lowest noise but not the lowest in microphony. Triode balance will be similar to Gold grade.\u003cbr\u003e\u003cem\u003eThis grade is only suitable for use in the driver stage of an amplifier, or the output\/buffer stage of a DAC or CD Player.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIf you have a preamp or phonostage, you need at least Gold grade.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"%%GLOBAL_ShopPath%%\/pages\/Testing-Small-Signal-Tubes.html\" target=\"_blank\" rel=\"noopener noreferrer\"\u003e\u003cstrong\u003eClick here for a more in depth discussion on how we grade tubes.\u003cbr\u003e\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003ePrice includes matching in any quantity you need at \u003cstrong\u003eno extra charge.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Upscale Certified Tubes","offers":[{"title":"Gold Grade \/ No Cryo","offer_id":21831149893,"sku":"TS5751-G","price":49.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ Yes Cryo","offer_id":25415563088,"sku":"TS5751-GC","price":57.95,"currency_code":"USD","in_stock":true},{"title":"Platinum Grade \/ No Cryo","offer_id":21831149957,"sku":"TS5751-P","price":59.95,"currency_code":"USD","in_stock":true},{"title":"Platinum Grade \/ Yes Cryo","offer_id":25415564560,"sku":"TS5751-PC","price":67.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ No Cryo","offer_id":29530419691580,"sku":"TS5751-KS","price":69.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ Yes Cryo","offer_id":29530419724348,"sku":"TS5751-KSC","price":77.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/066150e72af315701ade10a70d59181f.jpg?v=1583879418"},{"product_id":"mullard-new-production-cv4004-12ax7","title":"Mullard New Production CV4004 \/ 12AX7","description":"\u003cp\u003e\u003cstrong\u003eMullard CV4004 \/ 12AX7\u003c\/strong\u003e - Price of NOS 12AX7s got you down? This new re-issue of the famous Mullard CV4004 made in Russia is the answer to your woes! This is a short plate version of New Sensor's excellent Mullard 12AX7.  Very low noise and microphony make this tube an excellent candidate for many touchy preamps and phonostage applications. By all reports, these are even quieter than the long plates, so if you have a difficult circuit, this tube may be your solution.\u003c\/p\u003e\u003cp\u003eLike it's long plate brother, the CV4004 has a smooth midrange. Some folks have reported them to be a smidge relaxed on top. If you want something with a little more lively presentation, try the new production \u003cstrong\u003eTung-Sol 12AX7.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cem\u003e\u003cstrong\u003eA quick note on this tube:\u003c\/strong\u003e\u003c\/em\u003e The filaments on these tubes are almost completely encased in the plate structure. So if you don't see them glowing as bright as some of your other 12AX7s... don't sweat it. It's normal for this tube.\u003c\/p\u003e\u003cp\u003eThis tube tested extremely low in noise and microphonics across the board, so we do not have any Driver Grade.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003ePlatinum grade -\u003c\/strong\u003e The best of the best. Lowest noise and microphony with the tightest triode balance we have available. This is typically 10% or tighter, but may be higher depending on available stock.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eGold grade -\u003c\/strong\u003e Low noise and microphonics with a triode balance typically between 15% and 20%, but may be higher depending on available stock.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDriver\/Buffer grade -\u003c\/strong\u003e Lowest noise but not the lowest in microphony. Triode balance will be similar to Gold grade.\u003cbr\u003e\u003cem\u003eThis grade is only suitable for use in the driver stage of an amplifier, or the output\/buffer stage of a DAC or CD Player.\u003c\/em\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIf you have a preamp or phonostage, you need at least Gold grade.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/grading-and-matching-small-signal-tubes\" target=\"_blank\"\u003e\u003cstrong\u003eClick here for a more in depth discussion on how we grade tubes.\u003cbr\u003e\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"Mullard","offers":[{"title":"Platinum Grade \/ No Cryo","offer_id":21831306629,"sku":"MULLARDNS CV4004 P","price":46.95,"currency_code":"USD","in_stock":true},{"title":"Platinum Grade \/ Yes Cryo","offer_id":21831306565,"sku":"MULLARDNS CV4004 P C","price":54.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ No Cryo","offer_id":41659670397112,"sku":"MULLARDNS CV4004 G","price":36.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ Yes Cryo","offer_id":41659670429880,"sku":"MULLARDNS CV4004 G C","price":44.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ No Cryo","offer_id":29530419429436,"sku":"MULLARDNS CV4004 KS","price":56.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ Yes Cryo","offer_id":29530419462204,"sku":"MULLARDNS CV4004 KS C","price":64.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/17f1164adb746827e880226caf45354c.jpg?v=1741632490"},{"product_id":"electro-harmonix-12ay7-6072a","title":"Electro-Harmonix 12AY7 \/ 6072A","description":"\u003ch1\u003e\u003cstrong\u003eElectro-Harmonix 12AY7\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003eLooking for a good, reliable, current production 12AY7? Here it is! Made in Russia. Very quiet, transparent, detailed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlatinum grade -\u003c\/strong\u003e The best of the best. Lowest noise and microphony with the tightest triode balance we have available. This is typically 10% or tighter, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGold grade -\u003c\/strong\u003e Low noise and microphonics with a triode balance typically between 15% and 20%, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDriver grade -\u003c\/strong\u003e Lowest noise but not the lowest in microphony. Triode balance will be similar to Gold grade.\u003cbr\u003e\u003cem\u003eThis grade is only suitable for use in the driver stage of an amplifier, or the output\/buffer stage of a DAC or CD Player.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIf you have a preamp or phonostage, you need at least Gold grade.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/grading-and-matching-small-signal-tubes\" target=\"_blank\" rel=\"noopener noreferrer\"\u003e\u003cstrong\u003eClick here for a more in depth discussion on how we grade tubes.\u003cbr\u003e\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"Electro-Harmonix","offers":[{"title":"Platinum Grade \/ No","offer_id":21831813893,"sku":"EH12AY7 P","price":36.95,"currency_code":"USD","in_stock":true},{"title":"Platinum Grade \/ Yes","offer_id":32495810150460,"sku":"EH12AY7 P C","price":44.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ No","offer_id":21831813765,"sku":"EH12AY7 G","price":26.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ Yes","offer_id":32495810117692,"sku":"EH12AY7 G C","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ No","offer_id":29530418479164,"sku":"EH12AY7 KS","price":46.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ Yes","offer_id":32495810183228,"sku":"EH12AY7 KS C","price":54.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/4e1357232d2bfb6cd46a41fd807cfee2.jpg?v=1741632448"},{"product_id":"mullard-new-production-12au7-ecc82","title":"Mullard New Production 12AU7 \/ ECC82","description":"\u003cp\u003e\u003cstrong\u003eMullard 12AU7 \/ ECC82\u003c\/strong\u003e - Current production Russian re-issue. These tubes are quiet, they sound great, and are dependable... giving them Uncle Kevvy's seal of approval. A great choice for any 12AU7\/ECC82 circuit.\u003c\/p\u003e\n\u003cp\u003eThis tube tested extremely low in noise and microphonics across the board, so we do not have any Driver Grade.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlatinum grade -\u003c\/strong\u003e The best of the best. Lowest noise and microphony with the tightest triode balance we have available. This is typically 10% or tighter, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGold grade -\u003c\/strong\u003e Low noise and microphonics with a triode balance typically between 15% and 20%, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDriver\/Buffer grade -\u003c\/strong\u003e Lowest noise but not the lowest in microphony. Triode balance will be similar to Gold grade.\u003cbr\u003e\u003cem\u003eThis grade is only suitable for use in the driver stage of an amplifier, or the output\/buffer stage of a DAC or CD Player.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIf you have a preamp or phonostage, you need at least Gold grade.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/grading-and-matching-small-signal-tubes\" target=\"_blank\"\u003e\u003cstrong\u003eClick here for a more in depth discussion on how we grade tubes.\u003cbr\u003e\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"Mullard","offers":[{"title":"Platinum Grade \/ No Cryo","offer_id":21831879813,"sku":"MULLARD 12AU7 P","price":35.95,"currency_code":"USD","in_stock":false},{"title":"Platinum Grade \/ Yes Cryo","offer_id":21831879749,"sku":"MULLARD 12AU7 P C","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ No Cryo","offer_id":41659662008504,"sku":"MULLARD 12AU7 G","price":25.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ Yes Cryo","offer_id":41659662041272,"sku":"MULLARD 12AU7 G C","price":33.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ No Cryo","offer_id":29530418282556,"sku":"MULLARD 12AU7 KS","price":45.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ Yes Cryo","offer_id":29530418315324,"sku":"MULLARD 12AU7 KS C","price":53.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/8933ab466ff30b9a4963c48ef8dfce29.jpg?v=1741632446"},{"product_id":"mullard-new-production-12at7-ecc81","title":"Mullard New Production 12AT7 \/ ECC81","description":"\u003cp\u003e\u003cstrong\u003eMullard 12AT7 \/ ECC81\u003c\/strong\u003e - Current production Russian re-issue. These tubes are quiet, they sound great, and are dependable... giving them Uncle Kevvy's seal of approval. A great choice for any 12AT7\/ECC81 circuit.\u003c\/p\u003e\n\u003cp\u003eThis tube tested extremely low in noise and microphonics across the board, so we do not have any Driver Grade.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlatinum grade -\u003c\/strong\u003e The best of the best. Lowest noise and microphony with the tightest triode balance we have available. This is typically 10% or tighter, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGold grade -\u003c\/strong\u003e Low noise and microphonics with a triode balance typically between 15% and 20%, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDriver\/Buffer grade -\u003c\/strong\u003e Lowest noise but not the lowest in microphony. Triode balance will be similar to Gold grade.\u003cbr\u003e\u003cem\u003eThis grade is only suitable for use in the driver stage of an amplifier, or the output\/buffer stage of a DAC or CD Player.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIf you have a preamp or phonostage, you need at least Gold grade.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/grading-and-matching-small-signal-tubes\" target=\"_blank\"\u003e\u003cstrong\u003eClick here for a more in depth discussion on how we grade tubes.\u003cbr\u003e\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"Mullard","offers":[{"title":"Platinum Grade \/ No Cryo","offer_id":21831884869,"sku":"MULLARD 12AT7 P","price":31.95,"currency_code":"USD","in_stock":false},{"title":"Platinum Grade \/ Yes Cryo","offer_id":21831884805,"sku":"MULLARD 12AT7 P C","price":39.95,"currency_code":"USD","in_stock":false},{"title":"Gold Grade \/ No Cryo","offer_id":41664395247800,"sku":"MULLARD 12AT7 G","price":29.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ Yes Cryo","offer_id":41664395280568,"sku":"MULLARD 12AT7 G C","price":27.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ No Cryo","offer_id":29530418217020,"sku":"MULLARD 12AT7 KS","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ Yes Cryo","offer_id":29530418249788,"sku":"MULLARD 12AT7 KS C","price":51.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/7f8f66bb63efa20772f3c15b58bfa4fd.jpg?v=1741632444"},{"product_id":"primaluna-12au7-g2","title":"PrimaLuna -12AU7-","description":"\u003ch1\u003ePrimaLuna 12AU7\u003c\/h1\u003e\n\u003ch3\u003eNew PSVane model\u003c\/h3\u003e\n- This is the stock 12AU7 as found in the award-winning \u003cstrong\u003ePrimaLuna\u003c\/strong\u003e products. This tube is quiet, reliable, and sounds great.\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePricing above is for a single tube,\u003c\/strong\u003e and includes matching in any quantity you need at no extra charge. Tubes are tested to Platinum Grade standards.\u003c\/p\u003e","brand":"PrimaLuna","offers":[{"title":"Default Title","offer_id":39358603985080,"sku":"PL-12AU7-G2","price":59.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/files\/DSC_9863.jpg?v=1742406203"},{"product_id":"primaluna-12ax7-1","title":"PrimaLuna -12AX7-","description":"\u003ch1\u003ePrimaLuna 12AX7\u003c\/h1\u003e\n\u003cp\u003eThis is the stock 12AX7 as found in the award-winning \u003cstrong\u003ePrimaLuna\u003c\/strong\u003e products. This tube is quiet, reliable, and sounds great.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePricing above is for a single tube,\u003c\/strong\u003e and includes matching in any quantity you need at no extra charge. Tubes are tested to Platinum Grade standards.\u003c\/p\u003e","brand":"PrimaLuna","offers":[{"title":"Default Title","offer_id":41204642807992,"sku":"PL-12AX7-G2","price":59.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/files\/DSC_9855.jpg?v=1742406179"},{"product_id":"gold-lion-ecc83-12ax7-cv4004","title":"Gold Lion ECC83 \/ 12AX7 \/ CV4004","description":"\u003ch1\u003eGold Lion ECC83 \/ 12AX7 \/ CV4004\u003c\/h1\u003e\n\u003cp\u003eThese tubes tested extremely low in noise and microphonics across the board, so we do not have any Driver\/Buffer Grade.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlatinum grade -\u003c\/strong\u003e The best of the best. Lowest noise and microphony with the tightest triode balance we have available. This is typically 10% or tighter, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGold grade -\u003c\/strong\u003e Low noise and microphonics with a triode balance typically between 15% and 20%, but may be higher depending on available stock.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/grading-and-matching-small-signal-tubes\" target=\"_blank\"\u003e\u003cstrong\u003eClick here for a more in depth discussion on how we grade tubes.\u003cbr\u003e\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003ePrice includes matching in any quantity you need at \u003cstrong\u003eno extra charge.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Gold Lion","offers":[{"title":"Gold Grade \/ No Cryo","offer_id":40189180051640,"sku":"GOLDLIONCV4004 G","price":59.95,"currency_code":"USD","in_stock":true},{"title":"Gold Grade \/ Yes Cryo","offer_id":40189180084408,"sku":"GOLDLIONCV4004 GC","price":67.95,"currency_code":"USD","in_stock":true},{"title":"Platinum Grade \/ No Cryo","offer_id":40189180117176,"sku":"GOLDLIONCV4004 P","price":69.95,"currency_code":"USD","in_stock":true},{"title":"Platinum Grade \/ Yes Cryo","offer_id":40189180149944,"sku":"GOLDLIONCV4004 PC","price":77.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ No Cryo","offer_id":40189180182712,"sku":"GOLDLIONCV4004 KS","price":89.95,"currency_code":"USD","in_stock":true},{"title":"Kevin's Stash \/ Yes Cryo","offer_id":40189180215480,"sku":"GOLDLIONCV4004 KSC","price":97.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/gltube.webp?v=1741630837"}],"url":"https:\/\/upscaleaudio.com\/collections\/preamp-tubes.oembed?page=3","provider":"Upscale Audio","version":"1.0","type":"link"}