{"product_id":"quad-303-power-amplifier","title":"Quad 303 Power Amplifier","description":"\u003ch1\u003eQuad 303 Power Amplifier\u003c\/h1\u003e\n\u003ch3\u003eA compact class-AB power amplifier with 50 Wpc stereo output, bridged mono operation, balanced and single-ended inputs, custom 200 VA toroidal transformer, and Quad’s triples output stage\u003c\/h3\u003e\n\u003cp\u003eThe Quad 303 is a modern return to one of the most recognizable power amplifiers in British hi-fi. Designed to partner with the Quad 33 preamplifier, the new 303 keeps the visual identity and practical spirit of the original while updating the circuitry, build quality, connectivity, and speaker-driving capability for contemporary systems.\u003c\/p\u003e\n\u003cp\u003eRated at 50 Wpc into 8 ohms and 70 Wpc into 4 ohms, the 303 is designed for domestic hi-fi systems using moderately efficient loudspeakers, including Quad’s own electrostatic designs. It can also be switched into bridged mono mode, delivering 140 W into 8 ohms or 170 W into 4 ohms when used as a monoblock amplifier.\u003c\/p\u003e\n\u003ch4\u003eClassic Quad Power\u003c\/h4\u003e\n\u003cp\u003eThe original Quad 303 became known for honest power, reliability, and musical ease rather than brute-force specification-chasing. The new 303 follows the same thinking, with a class-AB amplifier section and custom 200 VA toroidal transformer in a compact, cool-running chassis.\u003c\/p\u003e\n\u003cp\u003eIts anodized chassis and CNC-routed heatsinks give the amplifier the unmistakable Quad look while providing a solid structure that resists interference from external vibration.\u003c\/p\u003e\n\u003ch4\u003eTriples Output Stage\u003c\/h4\u003e\n\u003cp\u003eThe Quad 303 uses Quad’s symmetrical triples output stage, developed to provide a fully symmetrical output section, reduce distortion, and keep the resting current independent of output transistor temperature.\u003c\/p\u003e\n\u003cp\u003eThe new version updates the original concept with a fully complementary output stage, improving linearity, bias stability, and stability under high-voltage and high-current conditions. Premium power transistors support excellent gain linearity and dynamic range.\u003c\/p\u003e\n\u003ch4\u003eStereo or Bridged Mono\u003c\/h4\u003e\n\u003cp\u003eIn stereo mode, the 303 delivers 50 Wpc into 8 ohms and 70 Wpc into 4 ohms. For systems requiring more power, the amplifier can be switched into bridged mono mode, where output rises to 140 W into 8 ohms or 170 W into 4 ohms.\u003c\/p\u003e\n\u003cp\u003eThis flexibility allows the 303 to operate as a compact stereo power amplifier or as one half of a higher-output monoblock pair.\u003c\/p\u003e\n\u003ch4\u003eModern Connectivity\u003c\/h4\u003e\n\u003cp\u003eThe Quad 303 includes both single-ended RCA and balanced XLR inputs, making it easy to partner with the Quad 33 preamplifier or other modern preamps. It also includes a 12 V trigger input, 12 V trigger link output, and high-quality speaker binding posts.\u003c\/p\u003e\n\u003ch4\u003eAbout Quad\u003c\/h4\u003e\n\u003cp\u003eFounded in London in 1936 by Peter Walker, Quad has built its reputation on disciplined engineering, practical design, and the enduring goal Walker described as “the closest approach to the original sound.” Originally focused on amplifiers and public-address equipment, the company moved to Huntingdon, Cambridgeshire, in 1941, where Quad’s British engineering, service, and development remain centered today.\u003c\/p\u003e\n\u003cp\u003eQuad’s history includes some of the most important products in British hi-fi, from the Quad II amplifier and the 33\/303 preamp and power amplifier combination to the 405 current-dumping amplifier. In 1957, Quad introduced the world’s first production full-range electrostatic loudspeaker, establishing a loudspeaker lineage that continues through generations of ESL designs.\u003c\/p\u003e\n\u003cp\u003eToday, Quad continues to balance heritage and renewal, developing electronics and loudspeakers that respect the company’s classic design values while addressing modern listening habits. Across its amplifiers, digital components, and loudspeakers, Quad remains defined by clarity, restraint, and engineering purpose.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eModern version of the classic Quad 303 power amplifier\u003c\/li\u003e\n\u003cli\u003eDesigned to partner with the Quad 33 preamplifier\u003c\/li\u003e\n\u003cli\u003eClass-AB power amplifier section\u003c\/li\u003e\n\u003cli\u003eQuad symmetrical triples output stage\u003c\/li\u003e\n\u003cli\u003e50 Wpc into 8 ohms and 70 Wpc into 4 ohms in stereo mode\u003c\/li\u003e\n\u003cli\u003e140 W into 8 ohms and 170 W into 4 ohms in bridged mono mode\u003c\/li\u003e\n\u003cli\u003eStereo\/bridge mode selection\u003c\/li\u003e\n\u003cli\u003eCustom 200 VA toroidal transformer\u003c\/li\u003e\n\u003cli\u003eFully complementary output stage\u003c\/li\u003e\n\u003cli\u003ePremium power transistors\u003c\/li\u003e\n\u003cli\u003eSingle-ended RCA input\u003c\/li\u003e\n\u003cli\u003eBalanced XLR input\u003c\/li\u003e\n\u003cli\u003eHigh-quality speaker binding posts\u003c\/li\u003e\n\u003cli\u003e12 V trigger input\u003c\/li\u003e\n\u003cli\u003e12 V trigger link output\u003c\/li\u003e\n\u003cli\u003eAnodized chassis with CNC-routed heatsinks\u003c\/li\u003e\n\u003cli\u003eClassic Quad Grey finish\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIncluded Accessories\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePower cord\u003c\/li\u003e\n\u003cli\u003eRemote control\u003c\/li\u003e\n\u003cli\u003eUser manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003ePower Output (Stereo 8 ohms, Stereo 4 ohms, Bridged 8 ohms, Bridged 4 ohms):\u003c\/b\u003e 50 Wpc, 70 Wpc, 140 W, 170 W\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Amplifier Section:\u003c\/b\u003e Class-AB\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eCore Technology:\u003c\/b\u003e Quad 303 triples output stage, custom 200 VA toroidal transformer, stereo\/bridge mode selection\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInputs:\u003c\/b\u003e 1 line, 1 XLR\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutputs:\u003c\/b\u003e 1 stereo speaker, 1 12 V trigger, 1 12 V trigger link\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Amplifier Gain:\u003c\/b\u003e 29 dB\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Amplifier Input Impedance (Line, XLR):\u003c\/b\u003e 15 kohms, 22 kohms\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Amplifier Input Sensitivity (Line, XLR):\u003c\/b\u003e 700 mVrms, 1.5 Vrms\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower Amplifier Signal-To-Noise Ratio:\u003c\/b\u003e \u0026gt;108 dB, A-weighted\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eMaximum Output Current:\u003c\/b\u003e 10 A\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eStandby Power Consumption:\u003c\/b\u003e \u0026lt;0.5 W\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDimensions (HLW):\u003c\/b\u003e 6.93\" × 12.80\" × 4.72\" (176 × 325 × 120 mm)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eWeight:\u003c\/b\u003e 18.52 lb. (8.4 kg)\u003c\/p\u003e\n","brand":"Quad","offers":[{"title":"Default Title","offer_id":53595047297208,"sku":"Q-303","price":1599.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/files\/303SilverStandard_1.jpg?v=1781906216","url":"https:\/\/upscaleaudio.com\/products\/quad-303-power-amplifier","provider":"Upscale Audio","version":"1.0","type":"link"}