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Review: Audio Research Corporation HD 220 Amplifier
https://forum.audiogon.com/discussions/review-audio-research-corporation-hd-220-amplifier
Review: Audio Research Corporation HD 220 Amplifier. My musical tastes include primarily classical, jazz, folk/blues and some exceptional rock. Specific recordings can be discussed via phone @ 610-721-1304. Soundstaging, dynamics, transparency and coherence are paramount, while the correct tonality and warmth are of equal concern.
Audio Research HD-220 Hybrid Fet Amplifier HD220
https://amlifiprea.com/hd-220
Audio Research Hybrid Drive Stereo Amplifier HD220 JFET Dual Triode Input Stage Used. USA Seller. And, needless to say, there are no output tubes to replace, ever. Both balanced and single-ended inputs are provided, as well as a detachable 20-amp IEC-connector power cord. In performance, as always, your own ears will be the final judge. Fixed Price
Owner’sManual - Audio Research
https://audioresearch.com/wp-content/uploads/2021/06/HD220_Manual.pdf
HD220 for On/Off control of the amplifier, or the 12V start-up trigger for remote installations. The AC power source for the HD220 amplifier should be capable of supplying 10 amperes for 100 or 120 volt units, or 5 amperes for 220 or 240 volt units. For …
Audio Research HD-220 Stereo Power Amplifier ... - HiFi Engine
https://www.hifiengine.com/manual_library/audio-research/hd-220.shtml
Gain: 20.8 dB. Input sensitivity: 4V. Signal to noise ratio: 112dB. Speaker load impedance: 4Ω (minimum) Valve complement: 2 x 6H30, 2 x 6922. Dimensions: 483 x …
ARCDB
https://www.arcdb.ws/model/HD220
HD220 poster Specifications Power output 220 watts per channel into 8 ohms from 20Hz to 20kHz. 380 watts per channel into 4 ohms. Power bandwidth (-3dB points) 2Hz to 80 kHz Frequency response (-3dB points at 1 watt) 0.5Hz to 200 kHz Input sensitivity 4.0V RMS BAL for rated output. (20.8 dB Bal gain into 8 ohms.) Input impedance
Audio Research HD 220 | diyAudio
https://www.diyaudio.com/community/threads/audio-research-hd-220.355576/
Freind of mine sent me his HD220 for repair - Blown rectifier was the issue - it had blown the inrush current limiters. Got the Bridge replaced and the amplifier powers up - it however never release the soft start, Ie close the large really to short out the resistor inrush current limiter series connection (which I replaced with a large 12A one)
Audio Research HD220 - kssons.com
https://kssons.com/audio-research-hd220/
HOTLINE 089-764-9999, 081-008-0008. BRAND: Audio Research SERIES: HD220
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