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Owner’sManual - Audio Research
https://audioresearch.com/wp-content/uploads/2021/06/HD220_Manual.pdf
model hd220 power hybrid drive power amplifier hd220 high definition® warning to prevent fire and shock hazard, do not expose this device to rain or moisture. unit must be operated in a horizontal position.-do not operate with covers removed-unit contains voltages which may be hazardous hd220 stereo amplifier volts serial plymouth, minnesota made in u.s.a.
Audio Research HD220 hybrid stereo amp. Re-capped and ...
https://www.audiogon.com/listings/lisa8336-audio-research-hd220-hybrid-stereo-amp-re-capped-and-serviced-many-positive-reviews-solid-state
Audio Research HD220 hybrid stereo amp. Re-capped and serviced. Many positive reviews! $9,000 MSRP [Expired] no longer for sale Average Research Pricing The HD220 is the best of both World's if you want a tube-like sound but with the power solid state.
HD220 Hybrid Drive Stereo Power Amplifier
https://www.digitec-derouet.com/photos/derouet_audio_research_hd220.pdf
HD220 Hybrid Drive Stereo Power Amplifier Whether tube or solid-state, power amplifier designs from Audio Research have always emphasized the key criteria of musicality, lifelike dynamics and realistic soundstaging. Whichever technology was used was intended to serve these priorities in the music reproduction chain.
Audio Research HD-220 Hybrid Fet Amplifier HD220 - amlifiprea
https://amlifiprea.com/hd-220
Review (mpn: HD-220 for sale) HD-220 AUDIO RESEARCH HD220 Hybrid Tube Fet Amplifier. This is an exceptional amplifier and blends the perfect balance of tube voltage gain stage with solid state current output. Driver tubes are Electra harmonics. I was using this to drive a pair of bl studio monitors and it always has ample power.
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
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