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From: Cursitor Doom <cd999666@notformail.com>
Newsgroups: sci.electronics.design,sci.electronics.repair
Subject: Re: Oscillator Distortion
Date: Mon, 14 Oct 2024 08:51:02 -0000 (UTC)
Organization: A noiseless patient Spider
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On Sun, 13 Oct 2024 17:39:53 -0700, Dave Platt wrote:

> In article <veguu6$ofj1$3@dont-email.me>,
> Cursitor Doom  <cd999666@notformail.com> wrote:
> 
>>I've found an issue with the principal oscillator. It's generating
>>distorted sine waves. It's a wien bridge type using BJTs as the gain
>>element and fine tungsten filaments as thermistors, so should produce
>>near perfect sine waves before they're chopped and shaped by subsequent
>>circuitry, but since the fall, it's not.
> 
> Is there a chance that the impact broke one of those fine tungsten
> filaments?  Do they read low-Z when cold, as they should?

It's one thing I need to look at, if only for the sake of completeness, 
next time I have access to it. Since these are so hard to replace, I'd 
really rather deal with my original suspicion that something got shorted 
out in the fall.