![]() Suffice to say that despite the review sample being 220V in a room typically graced with 245V from the mains, the amp never shut down, nor blow one of its fuses. Even with speakers which could take it, like the Wilson WATT Puppy 6, I couldn't get the LEDs to flicker because the output level was more than I could bear. I'm taking all of that on faith because I couldn't get this amp to misbehave, despite it being the first to leave the possession of Unison Research. And if it comes on simply because you're working it too hard (when THD exceeds 1 percent), you simply reduce the volume and the light extinguishes. Full-on red indicates that the mains input is too high or low, a fuse needs replacing, or the input signal is in overload. A red flashing indicates overheating, and active protection shuts down the amp, which automatically restarts the SR1 when the temperature lowers sufficiently. Another LED which glows green to indicate reception of the remote's signal, while LEDs to the extreme left and right indicate over-driving. A light on the front panel above the source/monitor toggle glows orange for the valve pre-heating 'warm-up' period, then green for 'fully operational'. You can also find more information on different products by visiting our Amplifier section.įirst, you operate the rocker at the back. You can compare the Unison Research SR1 against other tube amplifiers by reading our reviews for the Beam Echo tube amplifier and the EAR Paravicini M100A/312 amplifier. And all is revealed just by switching on. The result is a deliciously modern amplifier masquerading as a be-tubed anachronism. The most obvious manifestations are the modular internal construction, sophisticated protection circuitry, an unusual type of remote volume control, assorted warning lights and more. Leopoldo Rossetto of the Applied Electronics Department of the University of Padua, hence a circuit which seems like such a departure from their norm. The output stage? A complementary pair of power MOSFETs, symmetrical and operating in what is called Dynamic Class A mode.Īlong with the aforementioned evolutionary changes to Unison Research, the company has collaborated with Prof. The SR1 features a pure triode input stage followed by second triode driver stage with active bias control the two matched ECC82 double triodes which constitute the valve element are positioned proudly at the front of the amplifier in the classic Unison Research manner. For audiophiles everywhere else, 'hybrid' means a mixture of solid-state and valves, typically with transistors serving as the output stages - precisely what constitutes the SR1's layout. Personnel in Italy told me it was best not to use the Italian word for hybrid - 'ibrido' - as it has a connotation at street level relating to sexual ambiguity. ![]()
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