Audio Database
VT200
Commentary

This tube type stereo power amplifier was developed as the highest model of the VT series.

The unique output transformer also supports ultra-linear connection and cathode feedback to ensure extremely low drive impedance and highly efficient and stable operation.

A highly reliable large beam tube 6550C is carefully selected for the power stage. The 6550C has a 4-parallel push-pull configuration with 8 left and right channels for a total of 16 channels. Therefore, the output impedance is sufficiently low, and by reducing the number of turns of the transformer, an excellent wide range and constant loss are simultaneously realized.
The signal system has a balanced configuration for all stages. It is equipped in the input stage with a constant current source, the shortest signal path, and the LR independent dual monaural configuration to enhance the total perfection.

A 3-speed -speed silent fan in the center of the chassis to properly cool the vacuum tubes and assist in stable operation when needed.

There is no change in load condition or input sensitivity when either one balanced or one unbalanced input is used.
The impedance of this input circuit is set so that it can be used with either a tube type or a semiconductor type amplifier, so that there is no mismatch when a semiconductor type channel divider is connected.

Model Rating
Type Stereo power amplifier
Rated output 200W + 200W (continuous, 20 Hz to 20 kHz)
Output bandwidth 12 Hz to 120 kHz -3dB
Total harmonic distortion factor 1% (1 kHz, 200W)
0.01% or Less (1W)
Frequency characteristic 0.5 Hz ~ 200 kHz -3dB (1W)
Input sensitivity 2.5 Vrms (balanced / unbalanced)
Input impedance Balance : 200k Ω
Unbalanced : 100k Ω
Output terminal 1 Ω, 2 Ω, 4 Ω, 8 Ω, 16 Ω
Damping factor About 11
Signal-to-noise ratio 109 dB (at IHF, input short, rated sy passing power)
Slew rate 25V/ms
Rise time 1.5ms
Vacuum tube used 6550C : matched pair 8 pieces
6922 : 10 pieces
Pwer 100 VAC, 50Hz/60Hz
Power consumption 680W (No Signal)
1,200W maximum
External dimensions Width 483x Height 276x Depth 638 mm (Including Handle)
Weight 46.5 kg (Body)
58.3 kg (when packed)