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FL-2100B parasitic choke question

Crambone

Well-Known Member
Jan 22, 2019
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so my question is about testing a parasitic choke. I was just taking a peak in my FL-2100B and everything looks good as it should the amp is working fine. But one thing I never tested was a parasitic choke so I thought this would be a good opportunity to learn a bit.
Thank you for sharing your knowledge if possible.
 

That would require an engineering lab and knowledge of all of the design specifications.
Digital memory scopes and at least 3 engineers to work all of the test.

If your unit is working fine you probably do not have a problem.
 
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Am I correct in my reading that they limit frequencies at high voltages? Is oscillation caused by the over voltage or excessive frequency? I’m thinking it has to do with the tubes bias and frequency?
Again just trying to learn a bit, thanks for the reply’s
 
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On a lot of the tube amp stuff, I try to use a Hi Q input circuit. Something like a 5 and sometimes higher (11M) stuff. Won’t do anything for IMD, but it really helps on the harmonics.
 
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