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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 …
ARCDB
https://www.arcdb.ws/model/HD220
Recent advances in solid-state output devices and other components have opened up design possibilities as never before, allowing 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.
Audio Research HD-220 Stereo Power Amplifier Manual | HiFi ...
https://www.hifiengine.com/manual_library/audio-research/hd-220.shtml
Specifications. Power output: 220 watts per channel into 8Ω (stereo) Frequency response: 0.5Hz to 200kHz. Gain: 20.8 dB. Input sensitivity: 4V. Signal to noise ratio: 112dB. Speaker load impedance: 4Ω (minimum)
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
The HD220 is the best of both World's if you want a tube-like sound but with the power solid state. Being a hybrid design, it uses two 6922 and two 6H30 tubes in the input stage with a solid state output stage that produces 220W in 8 ohm and 380W in 4 ohm.
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)
Hybrids Are Hot | Stereophile.com
https://www.stereophile.com/ces2007/011207hybrid/index.html
Wes Phillips & Jon Iverson | Jan 12, 2007. "Recent advances in solid-state output devices and other components have opened up design possibilities never previously available," Audio Research's Terry Dorn explained. "And thatled to our developing the Hybrid Drive HD220 stereo power amplifier ($8995)." A JFET input feeds a 6922 dual-triode gain stage, which, in …
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