{"product_id":"audio-research-reference-330m-monoblock-poweramplifier-each","title":"Audio Research Reference 330M Monoblock Poweramplifier (each)","description":"\u003ch1\u003eAudio Research Reference 330M Monoblock Power Amplifier\u003c\/h1\u003e\n\u003ch3\u003e330 W of Fully Balanced, All-Tube Reference Power With Automatic Bias and KT170 Output Tubes\u003c\/h3\u003e\n\u003cp\u003eThe Reference 330M is Audio Research's flagship monoblock power amplifier and the culmination of more than 50 years of vacuum-tube amplifier design. Rated at 330 W, it combines substantial output capability with an all-tube signal path, beginning with an ECC83 input stage and culminating in six KT170 output tubes per monoblock.\u003c\/p\u003e\n\u003cp\u003eAudio Research describes the Reference 330M as the finest amplifier it has created. Its architecture combines a fully balanced circuit with tube regulation in the power supply, while both balanced XLR and single-ended inputs make it practical to integrate into a wide range of reference systems. Separate 4-ohm and 8-ohm output taps accommodate different loudspeaker loads.\u003c\/p\u003e\n\u003ch4\u003eHigh Power Without the Usual Tube-Amp Fuss\u003c\/h4\u003e\n\u003cp\u003eAutomatic bias continuously maintains the output tubes' operating conditions, eliminating routine manual bias adjustment. Audio Research specifies output-tube life at 3,000 hours, while an onboard tube-hour meter and tube-monitoring system help owners keep track of operation and maintenance.\u003c\/p\u003e\n\u003cp\u003eThe Reference 330M also provides adjustable fan speed, meter illumination that can be dimmed or switched off, and a meter-action control that can stop the meter needle when desired. A defeatable auto-off function shuts down the amplifier after two hours without a detected signal.\u003c\/p\u003e\n\u003ch4\u003eBuilt for Integrated Reference Systems\u003c\/h4\u003e\n\u003cp\u003eFor system control, the Reference 330M provides 12 V trigger operation and RS-232 control. The trigger input allows the amplifier to power up along with a Reference preamplifier or compatible master-control system, while standby mode provides a convenient power-saving state.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e330 W monoblock power output\u003c\/li\u003e\n\u003cli\u003eFully balanced amplifier design with an all-tube signal path\u003c\/li\u003e\n\u003cli\u003eSix KT170 output tubes per monoblock\u003c\/li\u003e\n\u003cli\u003eECC83 and 6H30 input tubes\u003c\/li\u003e\n\u003cli\u003e6550 and 6H30 tubes in the power supply\u003c\/li\u003e\n\u003cli\u003eAutomatic tube biasing\u003c\/li\u003e\n\u003cli\u003e3,000-hour specified output-tube life\u003c\/li\u003e\n\u003cli\u003eBalanced XLR and single-ended inputs\u003c\/li\u003e\n\u003cli\u003e4-ohm and 8-ohm speaker output taps\u003c\/li\u003e\n\u003cli\u003e12 V trigger control\u003c\/li\u003e\n\u003cli\u003eRS-232 control\u003c\/li\u003e\n\u003cli\u003eDefeatable two-hour auto-off function\u003c\/li\u003e\n\u003cli\u003eAdjustable fan speed\u003c\/li\u003e\n\u003cli\u003eTube-hour meter and tube monitoring\u003c\/li\u003e\n\u003cli\u003eAdjustable meter illumination\u003c\/li\u003e\n\u003cli\u003eSwitchable meter-needle action\u003c\/li\u003e\n\u003cli\u003eStandby mode\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003ePower Output:\u003c\/b\u003e 330 W\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTube Biasing:\u003c\/b\u003e Automatic bias\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput Taps:\u003c\/b\u003e 4 ohms, 8 ohms\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Output Tubes:\u003c\/b\u003e (6) KT170\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Tubes:\u003c\/b\u003e (1) ECC83, (1) 6H30\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Supply Tubes:\u003c\/b\u003e (1) 6550, (1) 6H30\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInputs:\u003c\/b\u003e XLR, single-ended\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eControls:\u003c\/b\u003e 12 V triggers, RS-232 remote control\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Saving:\u003c\/b\u003e Standby mode\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eWeight:\u003c\/b\u003e 101 lb. (45.8 kg)\u003c\/p\u003e","brand":"Audio Research","offers":[{"title":"Black","offer_id":53876968751288,"sku":"ARC-REF330M-BLK","price":45000.0,"currency_code":"USD","in_stock":true},{"title":"Natural (Silver)","offer_id":53876968784056,"sku":"ARC-REF330M-NAT","price":45000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/files\/330M-launch-image-front.jpg?v=1787611203","url":"https:\/\/upscaleaudio.com\/products\/audio-research-reference-330m-monoblock-poweramplifier-each","provider":"Upscale Audio","version":"1.0","type":"link"}