Control Functions: Power On/Off, Tube Bias Check/Adjust, Fan Speed
Input: BAL only.
Outputs: 4, 8, 16 ohms.
Power Output: 200 watts per channel continuous
from 20Hz to 20kHz. 1kHz total harmonic distortion typically 0.5% at
200 watts, below .02% at 1 watt. Approximate actual power available at
"clipping" 210 watts (1kHz). (Note that actual 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
(Damping factor approximately 14).
Overall Negative Feedback: 12dB. Slew Rate: 40 volts/microsecond.
Rise
Time: 1.2 microseconds.
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".
Tubes Required: 3 - Matched pair 6550C (Power output V1-6); 1-Matched
pair 6L6GC (Driver V8-9); 2-6N1P (Gain stage V7 and Regular Driver
V12); 1-Matched pair 6AS7G (Regulator V10-11).
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: 74 lbs. (33.6 kg) Net; 89 lbs. (40.4 kg)
Valve amplifier (200w stereo)Bal-I, SE-I
The Valve VTM200 vacuum tube stereo power amplifier is the most powerful of the three Valve-series models. Rated at 200 watts per channel into a wide range of speaker loads, the Valve VTM200 encompasses a "dual mono" circuit layout reaching back to the massive single power transformer. Eight matched pair of 6650C output tubes and 674 joules of distributed energy storage give the Valve VTM200 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 for quicker transient attack and explosive musical dynamics.
As with other Valve models, constant-current sources in the input stage help maintain stable drive characteristics and differential balance of the output stage under the rapidly changing demands of actual music reproduction. Ultralinear output transformers with partial cathode coupling to the output terminals give the Valve VTM200 higher efficiency and lower output impedance than conventional vacuum-tube amplifiers. This results in better control of the loudspeaker throughout its frequency and impedance 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 16 ohms.
Internally, the Valve VTM200 presents a very open architecture within a spacious, rugged chassis. A single cooling fan operable at three different speeds provides unobstrusive cooling of interior components, including the vacuum tubes mounted along the chassis sidewalls.
