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RE: Frequency, etc

Posted by fredtr (A) on March 23, 2021 at 10:24:58

In Reply to: Frequency, etc posted by Lew on March 23, 2021 at 09:07:34:

Thank-you for posting the schematic, I like unusual problems. My suggestion is poke it with a stick, I better explain that. When I try to figure out a problem where I don't seem to have enough information, but do have some guesses, I try some change that will tell me if I am on the right track or not, or just provide more info about the nature of the problem.

Looking at the schematic, it is possible that the oscillation is caused by the cathode circuit V201 and V203, specifically the varistor, 470pF cap, resistors and diode. The changes you could make, to see if it impacts the problem is to try a lower noise diode (which may be triggering the oscillation), or change the RC time constant, by changing the value of the 470pF cap or varistor which has a capacitance of 500pF. If you try a change, and the oscillation is still there, check to see if the frequency of the oscillation has changed.

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