1 pair of Audio Research VTM-200 mono-block amplifiers in good physical condition. One amplifier was back to the factory in 2019 and had a regulator replaced and has been in the box ever since. One amp is devoid of tubes and the other has 3 tubes that are confirmed as "bad" - I would plan on a total tube replacement after purchase. There is one spacer on the back of each amp that is slightly bent (see photos). These amps are being sold "as-is" and the buyer should have some ability/desire to "tinker" after the sale as well as the tube replacement. These amps sold new for $16,000.00/pair and when back at full performance would make a great addition to any high-end system. I have factory box/packing for only one chassis so the second one would have to be boxed and packed in non-factory materials and the amps will have to be strapped to a skid and shipped via common carrier for safe delivery.
The VTM200 is an exciting new amplifier design for a number of reasons. First, it packs a strong 200 watts RMS output into a chassis size identical to the VT100MKII stereo. That means it can easily be tucked into a ventilated cabinet or behind a loudspeaker. Internal fan cooling is controlled by a two-speed switch on the rear panel. Output tube biasing is very user friendly, incorporating a simple rotary switch and large three-digit LED display on the back of the chassis. The system works by adjusting bias on just two of six 6550C output tubes, and checking bias level on the remaining four tubes. Input is XLR - only for best performance; output taps are provided for 4, 8 or 16-ohm speaker loads. We've even incorporated a 12V power -on.off trigger for custom-installation purposes.
Using classic vacuum-tube circuit design, the input stage of the VTM200 uses direct-coupled JFETs for ultra low noise. The input stage is followed by a single 6N1P vacuum-tube amplifying stage, which in turn is coupled to a pair of triode-connected 6L6GC tubes used as direct-coupled, cathode-follower drivers to provide exceptional linearity combined with good stability and service life. The output stage of six 6550 tubes is fed by a power supply with 438 joules of energy storage. Screen voltage for the partially cathode coupled output stage is supplied via two 6AS7 regulator tubes (in current production) driven by a 6N1P. The end result is an input/drive/output combination with incredible linearity and dynamic headroom, having great stability under dynamic conditions and varying speaker loads. The VTM200 should prove to be one of the most successful and popular Audio Research power amplifiers ever.
Sonically, the VTM200 has resolving power and musical dynamics which easily put it in the Reference class. Bass response is fast and powerful - here's where the big, linear power supply shows its mettle! Staging is extremely well-focused, layered and naturally proportioned. In fact, the VTM200 likely sets a new standard in its class with its ability to spatially replicate a good recording. With power, richness of body and an uncanny ability to resolve small textural and harmonic detail, the VTM200 is the kind of amplifier that demands to be driven by a current-generation Audio Research preamplifier.
MSRP (US NEW RETAIL) $13,990/pair. Increased to $14,990 on Feb 5 2001. Increased to $15,990 on Jan 01 2004.
POWER OUTPUT 200 watts per channel continuous from 20Hz to 20kHz. 1kHz total harmonic distortion typically 0.5% at 200 watts, below 0.02% at 1 watt. Approximate actual power available at "clipping"; 210 watts (1kHz). (Note that actual RMS power output is dependent upon both line voltage and ‘condition’ i. e.: if power line has high distortion, maximum power will be affected adversely, although from a listening standpoint this is not very critical.) POWER BANDWIDTH (-3dB points) 10Hz to 200kHz FREQUENCY RESPONSE (-3dB points at 1 watt) 0.5Hz to 240 kHz INPUT SENSITIVITY 1.7V RMS Balanced for rated output. (27 dB gain into 8 ohms) INPUT IMPEDANCE 200K ohms Balanced OUTPUT TAPS 4, 8, 16 ohms OUTPUT REGULATION Approximately 0.6dB 16 ohm load to open circuit OVERALL NEGATIVE FEEDBACK 12dB DAMPING FACTOR Approximately 14 DISTORTION 1kHz total harmonic distortion typically 0.5% at 200 watts, below .02% at 1 watt SLEW RATE 40V/µs RISE TIME 1.2 µs HUM & NOISE Less than 0.2mV RMS - 109dB below rated output (IHF-A weighted, input shorted, 16 ohm output) POWER SUPPLY ENERGY STORAGE Approximately 438 joules POWER REQUIREMENTS 105-125VAC 60Hz (210-250VAC 50Hz) 670 watts at rated output, 850 watts maximum, 400 watts at "idle" TUBE COMPLEMENT (3 matched pairs) 6550C power output, (1 matched pair) 6L6GC driver, (2) 6N1P gain stage and regular driver, (1 matched pair) 6AS7G regulator DIMENSIONS 19" (48.3 cm) W x 8 ¾" (22.2 cm) H x 19½" (49.5 cm) D. Handles extend 1½" (3.8 cm) forward WEIGHT 74 lbs. (33.6 kg) Net; 89 lbs. (40.4 kg) Shipping