11-02-2017, 08:34 AM
That ocurred to me as well, as I have come across the same thing. I have tried two or three, and some are better than others. But the EF39s immediately to hand last night have pretty poor coatings although I have some good ones out in the shed, and I will try them today. Replacing the cathode by-pass did not make the slightest bit of difference. Volume is good and tone fine, but decreases if I increase the HT. There is so much left to check and replace - the wiring is in a dreadful state, but I am at last getting somewhere.
Bob
Bob
