Hoping for a life line, and a long shot at that!
I've got a very pretty MR65 (s/n 107R0) on the bench from a fellow AKer. The mixer output transformer (T2, Automatic Radio part T-107-134A) appeared to be suffering from the silver migration problem. Have done the surgery to lose the internal capacitors, and that went pretty well. I'm planning to install external silver mica parts.
I don't suppose anyone has already sussed out what values might work well for external caps?
I did try some bench testing in isolation, but I'm not sure whether to trust that for any better than an order-of-magnitude estimate. Seems like the order of 10-100pF is the right ballpark for both primary and secondary. I'm not even sure whether to expect primary and secondary to be the same.
Thanks!
chazix
I've got a very pretty MR65 (s/n 107R0) on the bench from a fellow AKer. The mixer output transformer (T2, Automatic Radio part T-107-134A) appeared to be suffering from the silver migration problem. Have done the surgery to lose the internal capacitors, and that went pretty well. I'm planning to install external silver mica parts.
I don't suppose anyone has already sussed out what values might work well for external caps?
I did try some bench testing in isolation, but I'm not sure whether to trust that for any better than an order-of-magnitude estimate. Seems like the order of 10-100pF is the right ballpark for both primary and secondary. I'm not even sure whether to expect primary and secondary to be the same.
Thanks!
chazix