The capacitors is something i never thought about until i was reading your
message. I've restored a old AM broadcast band radio once and I had to
replace all the capacitors, but I never thought about it on the SB-102.

Jeremy-

I've been through that with old radios as well. Back in the late 50s or early
60s, there was a major improvement in capacitor construction. They introduced
a layer of plastic film (mylar?) with the paper, and drasticaly reduced leakage
as the capacitor aged. That is why I wouldn't just replace capacitors without
some other symptom.

Another thing to check, is whether the microphone amplifier tube is the correct
one. If a 12AU7 had been installed in place of a 12AX7, the gain would be
somewhat lower, but the tube might check 100%.

73, Fred, K4DII