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Both of my Zeniths, a M and an N chassis have eaten their vertical output transformers. The M ate a second Zenith vertical output. I replaced all with Thordarson and so far they are fine. They started off with a slightly jumpy vertical then went to what looked like severe interference and overheating resistors in the vertcal output stage. The convergence winding was leaking to the primary winding.
Tin whiskers have mainly showed up in my old Admiral black and whites.
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