• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Bogen tube amp with variable Damping Factor

Hello everybody. Please is there perhaps a chance someone here can direct me to knowledge about this item which I believe is an audio amplifier with adjustable damping factor and adjustable input and output.

The amp chasis is 15" x 4" x 2" and the paint color is faded, tending to gold, copper, and brown.

(The painted label) - David Bogen Co. Inc. New York 14, N.Y.

- Model D070 -Series C-56 (series #4883 stamped in the metal). Uses tubes-5U4GB, 6BF5, EL34/GCA7, 12AX7/ECC83, 6CG7.

Rotary controls are labeled: Power Mon., Damping Factor, and Input level.

Speaker impedance slide switch for either 8 or 16 ohms.
Connector is labled: GND, COM, B, A

There is also a jumper with three positions which is not labled.

There are two large transformers labeled T3147-2 the other labeled T2123.


  • bbogen-model-d070,-series-c.jpg
    54.7 KB · Views: 153