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 Post subject: F-30 problem
PostPosted: Fri Oct 09, 2015 2:42 pm 
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Mark I

Joined: Fri Jun 16, 2006 8:17 pm
Posts: 28
Hello, I have an F-30 that has a problem. According to the tech that looked at it he gave me a note that reads the following:

It says there's a short in the 6.3 dc filament circuit, and that with the dc disabled and filament voltage jumped to v1/v2 the amp will play but it's noisy. Also the ac power is currently disconnected to protect it from being hurt by accident.

I can't afford for him to repair it so I could use some assistance as what I should be looking for. I have worked on and repaired many amps over the years but the repairs were generally replacing burnt up parts like resistors, caps, bridge rectifiers or doing bias type work.

Thanks...


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 Post subject: Re: F-30 problem
PostPosted: Fri Oct 09, 2015 6:55 pm 
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Single Recto
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Joined: Sat Jan 12, 2008 12:32 pm
Posts: 1279
Sounds like there might be a shorted diode. Does the channel switching work?


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