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Audio Research D-250 II Servo power amplifier ...
https://www.stereophile.com/tubepoweramps/413/index.html
The D-250 is the flagship of Audio Research's power amplifier range and, at 250 watts per channel, is the most powerful all-tube stereo amplifier currently available in the US. Under the circumstances, then, it is not surprising that it should also be one of the heaviest and largest. The appearance alone of the D-250 inspires respect. The amplifier is huge, with most …
Audio Research REF 250 Monoblocks – Reviews | TONEAudio ...
https://www.tonepublications.com/review/audio-research-ref-250-monoblocks/
Power output meters are just cool. Back in the late 80s when the legendary Audio Research D-79 amplifier stood as my system’s cornerstone, watching the meters bounce into the red “caution” area—as the SPL got somewhat out of hand—made me feel like a mad scientist in a Mothra movie, waiting for sparks to fly.
Audio Research D-250 II Servo power amplifier Page 2 ...
https://www.stereophile.com/content/audio-research-d-250-ii-servo-power-amplifier-page-2
Audio Research D-250 II Servo power amplifier Page 2. All large-value capacitors in the signal path have polypropylene dielectric, and are bypassed with small-value polystyrene caps. There are only five such banks in the signal path: two per side plus an additional one for the phase inverter. Phase inversion is accomplished in an unusual manner.
Audio Research Reference 250 SE Amplifier - The …
https://www.theabsolutesound.com/articles/audio-research-reference-250-se-amplifier
Near the end of my review process I had the luxury of pairing the 250 SEs with Audio Research’s Ref 10 Phono and Ref 10 linestages. It immediately became obvious that all three pieces of equipment were designed with the same sensibilities, leading to a synergy that added substantial enjoyment to the listening experience.
Audio Research Reference 250 monoblock amplifiers - Hi-Fi+
https://hifiplus.com/articles/audio-research-reference-250-monoblock-amplifiers/
Audio Research has never been a great proponent of low or no negative feedback in its power amp designs (because you sacrifice output impedance and damping factor, as well as generally giving better measurement on the bench), and the Reference 250 is no exception, with a healthy 8.8% global feedback across the circuit.
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