• 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.

Zenith 7B31 Help

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Any body rebuilt one of these as a stand alone amp? How did you bias the amplifier tubes (12AU7)? Most of the bias feed back circut is in the preamp that I don't have.

As a foot note these things must have been as piece of crap in thier day. On mine the insulation on the 355V feed has been burned through in two places by power resistors placed against them. The best I can tell it was this way from the factory.
 
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