Zenith 7B31 Help

Troncones · 15th January 2010, 04:12 AM

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.

Troncones · 15th January 2010, 01:06 PM

Actually the question should be; what did you the replace the Mid Mue 12AU7 with and how did you bias it?

15th January 2010, 04:12 AM	#1
Troncones diyAudio Member Join Date: Dec 2009 Location: Orange County, California.	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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15th January 2010, 01:06 PM	#2
Troncones diyAudio Member Join Date: Dec 2009 Location: Orange County, California.	Actually the question should be; what did you the replace the Mid Mue 12AU7 with and how did you bias it?