01-19-2022, 07:27 PM
Good news. I received a 7B7 replacement from my area local Amtique Radio Club. (http://vrps.org/) Radio is up and running. One thing to resolve. Not sure which direction. All local stations come in well but a slight hum. I was wondering if the RR electrolytics are the cause. The original radio had a PM speaker retrofittrd installed but they installed a choke coil in lieu of subtituting with resistors and larger Caps. The original schematic calls for 20UF x2 with the original speaker, but the radio had 2 30Ufs I Replaced closesest 32UFs x2. Are these electrolytics too large?