Audio Research VT200 Amplifiers 3 Pristine Units. Amplifiers run a pair of Apogee Diva Full Range Speakers in a Tri-Amplified Configuration. 1 Black Face Unit , 1 Gold Face, Unit 1 Titanium Face Unit. All are in EXCELLENT condition. Will include custom elevated Granite Amp Stand to enable maximum air flow below the units. No marks, ch chips, operated in Smoke Free Home! Specifications: The VT200 vacuum tube stereo power amplifier is the mostpowerful of the three VT-series models. Rated at 200 watts per channel into awide range of speaker loads, the VT200 encompasses a dual monocircuit layout reaching back to the massive single power transformer. Eightmatched pair of 6650C output tubes and 674 joules of distributed energy storagegive the VT200 unwavering control over the most difficult speaker loads,without sacrificing dynamic freedom or musical nuance.Separate left and right input and output circuit boards,with distributed power supplies, keep signal path lengths at a minimum forquicker transient attack and explosive musical dynamics. As with other VTmodels, constant-current sources in the input stage help maintain stable drivecharacteristics and differential balance of the output stage under the rapidlychanging demands of actual music reproduction. Ultralinear output transformerswith partial cathode coupling to the output terminals give the VT200 higherefficiency and lower output impedance than conventional vacuum-tube amplifiers.This results in better control of the loudspeaker throughout its frequency andimpedance spectrum.Both single-ended (100K ohms) and balanced (200K ohms)inputs are included to allow use with any high-quality stereo preamplifier.Custom-machined, gold-over-brass five-way output terminals allow a secure,high-contact connection to a variety of speaker impedances: 1, 2, 4, 8 or 16ohms.Internally, the VT200 presents a very open architecturewithin a spacious, rugged chassis. A single cooling fan operable at threedifferent speeds provides unobstrusive cooling of interior components,including the vacuum tubes mounted along the chassis sidewalls.Biasing of the output tubes is easily accomplished via twotrim pots for each channel, accessible through holes located along eachsidewall of the chassis.