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Zenith 7B31 Help
Zenith 7B31 Help
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Old 15th January 2010, 05:12 AM   #1
Troncones is offline Troncones  United States
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Default Zenith 7B31 Help

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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Old 15th January 2010, 02:06 PM   #2
Troncones is offline Troncones  United States
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Actually the question should be; what did you the replace the Mid Mue 12AU7 with and how did you bias it?
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