The VT100MKIII is an all-tube, balanced stereo power amplifier that draws upon the advanced technology of the flagship Reference Series models. Rated at 100 watts continuous output per channel, the VT100MKII is a Class AB, differential circuit design using two matched pair of 6550 output tubes in each channel, along with four 6922 twin triodes per channel for input and driver stages. A fully regulated, 540-joule power supply is distributed between two separate, isolated output circuit boards for short signal paths and true "dual mono" operation back to the massive main power transformer. Constant-current sources in the input stage help maintain stable drive characteristics and differential balance under the dynamic conditions of music reproduction.
Ultralinear output transformers and partial cathode coupling to the output terminals give the VT100MKII higher efficiency and lower output impedance than conventional designs for better drive into a wide variety of loudspeaker loads. Inputs include both single ended and balanced. Output terminals are custom-machined, heavy duty, gold-over-brass posts. A spacious chassis and single cooling fan help maintain conservative operating temperatures.Specifications
Power output 100 watts per channel continuous from 20Hz to 20kHz. Approximate actual power available at "clipping" 110 watts (1kHz)
Power bandwidth (-3dB points) 15Hz to 80kHz
Frequency response (-3dB points at 1 watt) 1Hz to 100 kHz
Input sensitivity 1.9V RMS (Bal or SE) for rated output. (23.5 dB gain into 8 ohms.)
Input impedance 200K ohms Balanced, 100K ohms Single-ended.
Output taps 8 ohms, 4 ohms
Output regulation Approximately 0.8dB 8 ohm load to open circuit
Overall negative feedback 10 dB
Damping factor 11
Distortion 1kHz total harmonic distortion typically 1% at 100 watts, below .05% at 1 watt
Slew rate 15 Volts/µs
Rise time 3 µs
Hum & noise Less than 0.5mV RMS 95dB below rated output (IHF weighted, input shorted)
Power supply energy storage VT100: 270 joules.
VT100 MKII/III: 540 joules
Power requirements 105-125VAC 60Hz (210-250VAC 50Hz) 585 watts at rated output, 750 watts maximum, 380 watts at "idle"
Tube complement VT100: (4 matched pairs) 6550 power output, (8) 6922
VT100 MKII: (4 matched pairs) 6550C power output, (4) 6922 driver, (4) 6922 input.
VT100 MKIII: (4 matched pairs) 6550C power output, (4) 6H30
Dimensions 19" (48.3 cm) W x 8.75" (22.2 cm) H x 19.5" (49.5 cm) D. Handles extend 1.5" (3.8 cm) forward
Weight 65 lbs. (29.5 kg) Net; 83 lbs. (37.7 kg) Shipping. We also have a matching ARC LS 25 and an ARC Ph3 tube phono secetion. Buy all 3 and SAVE!!!!! PayPal and shipping extra. Call Steve at 603-888-5104
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