01-02-2021, 07:30 PM
The way to tell if the micas are arcing/leaking is look at the grid DC voltage, preferable with a scope. If the grid shows positive voltage spikes, there you go. The K-Tran series cans are especially prone to this. They were heavily used in the AA5 series. I had one go once in a cheap AA5 and I didnt want to waste a new can as the slug was broken too. I made a 455 Kc ferrite xformer that worked well.
Peter
Peter