Audio Research V70

Commentary

This is a stereo power amplifier that utilizes the attractiveness of the large output tube KT90 in a hybrid configuration.

The input stage consists of FET, and the driver stage uses a total of four 6CG7 bi-triode tubes.
The output stage uses a 3-pole tube connection of KT90. A balance circuit is formed by performing parallel push-pull operation of two KT90s with four KT90s per channel, and independently amplifying the plus side waveform and the minus side waveform of the signal.

The power supply section is equipped with a heavy-duty transformer and a large-capacity capacitor. The bridge connection of diodes is used instead of vacuum tubes.

The input terminal is equipped with XLR terminal.

Model Rating

Type	Stereo power amplifier
Output	60W + 60W (4 Ω ~ 16 Ω)
Input sensitivity	1.1V/400k Ω (Balanced)
Frequency characteristic	12 Hz to 40 kHz -3dB
Power consumption	700W (at rated output) 370W (idle)
External dimensions	Width 480x Height 180x Depth 400 mm
Weight	29kg