{"product_id":"reference-330m-monoblock-power-amplifier","title":"Reference 330M Monoblock Power Amplifier","description":"\u003cp\u003eAudio Research’s Reference 330M monoblock represents the pinnacle of the company’s five decades of amplifier design, delivering 330 watts of tube power with an authority that commands the most demanding loudspeakers. Its fully balanced, all-tube signal path—from the ECC83 input stage through KT170 output tubes—achieves a rare combination of high-power ease and the delicate resolution more commonly associated with low-wattage designs. The result is a presentation of tonal density, spatial specificity, and dynamic life that retrieves every thread of a recorded performance.\u003c\/p\u003e\n\u003cp\u003eEngineered for daily reliability, the 330M includes auto-bias circuitry that maintains consistent performance without user intervention, while a tube hour meter, fan speed control, and defeatable auto-off provide practical oversight. Both balanced XLR and single-ended inputs ensure broad compatibility with upstream electronics, and 12V triggers plus RS-232 control simplify integration into advanced systems. Weighing 101 lbs, the amplifier’s substantial power supply and tube regulation contribute to its vice-like grip on loudspeakers, extending control down through the lowest octaves with a composure that serves the music first.\u003c\/p\u003e\n\u003ctable class=\"pu-table\" style=\"width:100%;border-collapse:separate;border-spacing:0;border:0;box-shadow:none;outline:none;background:none;table-layout:fixed;margin:0\"\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd style=\"border:0;padding:0\"\u003e\n\u003ch3 style=\"margin:1.25em 0 0.5em\"\u003e\n\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 24 24\" width=\"18\" height=\"18\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.75\" stroke-linecap=\"round\" stroke-linejoin=\"round\" style=\"display:inline-block;width:1.1em;height:1.1em;vertical-align:-0.18em;margin-right:0.45em\" aria-hidden=\"true\"\u003e\u003cpath d=\"M16 18a2 2 0 0 1 2 2a2 2 0 0 1 2 -2a2 2 0 0 1 -2 -2a2 2 0 0 1 -2 2zm0 -12a2 2 0 0 1 2 2a2 2 0 0 1 2 -2a2 2 0 0 1 -2 -2a2 2 0 0 1 -2 2zm-7 12a6 6 0 0 1 6 -6a6 6 0 0 1 -6 -6a6 6 0 0 1 -6 6a6 6 0 0 1 6 6z\"\u003e\u003c\/path\u003e\u003c\/svg\u003eHighlights\u003c\/h3\u003e\n\u003cul style=\"list-style:none;padding-left:0;margin:0 0 1em\"\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e✓ The 330M is designed to provide performance consistency.\u003c\/li\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e✓ Auto bias assures rock-steady consistency.\u003c\/li\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e✓ Output tube life is 3,000 hours.\u003c\/li\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e✓ A fully-balanced design, the addition of single-ended inputs allows compatibility with virtually any source.\u003c\/li\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e✓ 12 volt triggers allow the 330M to be turned on remotely.\u003c\/li\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e✓ RS232 control.\u003c\/li\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e✓ Auto-off control turns the 330M off if no signal is sensed in two hours (defeatable).\u003c\/li\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e✓ Fan speed control.\u003c\/li\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e✓ Tube hour meter.\u003c\/li\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e✓ 4-8 ohm speaker outputs.\u003c\/li\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e✓ Tube monitor.\u003c\/li\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e✓ Meter light control allows dimming or off.\u003c\/li\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e✓ Meter action switch allows the meter needle to be turned off.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ctable class=\"pu-table\" style=\"width:100%;border-collapse:separate;border-spacing:0;border:0;box-shadow:none;outline:none;background:none;table-layout:fixed;margin:0\"\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd style=\"border:0;padding:0\"\u003e\n\u003ch3 style=\"margin:1.25em 0 0.5em\"\u003e\n\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 24 24\" width=\"18\" height=\"18\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.75\" stroke-linecap=\"round\" stroke-linejoin=\"round\" style=\"display:inline-block;width:1.1em;height:1.1em;vertical-align:-0.18em;margin-right:0.45em\" aria-hidden=\"true\"\u003e\u003cpath d=\"M4 17v2a2 2 0 0 0 2 2h12a2 2 0 0 0 2 -2v-2\"\u003e\u003c\/path\u003e\u003cpath d=\"M7 11l5 5l5 -5\"\u003e\u003c\/path\u003e\u003cpath d=\"M12 4l0 12\"\u003e\u003c\/path\u003e\u003c\/svg\u003eDownloads\u003c\/h3\u003e\n\u003cul\u003e\u003cli style=\"margin:0 0 0.35em\"\u003e\u003ca href=\"https:\/\/audioresearch.com\/new_website\/wp-content\/uploads\/2026\/06\/Ref-330M-Owners-Manual.pdf\" target=\"_blank\" rel=\"noopener nofollow\"\u003eOWNERS MANUAL\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003c\/td\u003e\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Audio Research","offers":[{"title":"Default Title","offer_id":43181729218658,"sku":null,"price":50000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2475\/2780\/files\/reference-330m-monoblock-power-amplifier-5.jpg?v=1786014120","url":"https:\/\/pearlaudio.com\/products\/reference-330m-monoblock-power-amplifier","provider":"Pearl Audio","version":"1.0","type":"link"}