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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.
HD220 Hybrid Drive Stereo Power Amplifier
https://www.digitec-derouet.com/photos/derouet_audio_research_hd220.pdf
Audio Research engineers to combine the strengths of two different technologies in a completely new power amplifier: the new Hybrid Drive HD220 stereo power amplifier. We call it “Hybrid Drive” because that’s how it works. As in the Reference 110, a JFET input (for low noise) feeds a 6922 dual triode
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 Hybrid Fet Amplifier HD220 - amlifiprea
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
High Fidelity: Audio Research HD 220 hybrid amplifier
https://he-japu.blogspot.com/2007/03/audio-research-hd-220-hybrid-amplifier.html
Audio Research HD 220 hybrid amplifier. ARC continues to roll out aggressively new products. The company has so far renewed its entire Reference family (widely lauded by reviewers) and introduced a number of new line stages. In CES 2007 ARC announced a ground-breaking product for them, a hybrid HD220 amplifier. As in the REF110, a JFET input - for low …
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