09-01-2020, 05:34 PM
About that 50B5? I do not have a sch for the code 125 but the info I have shows 50L6 or 50A5. The 50B5 is a seven pin tube was only used a few years before being replaced by the 50C5. Something about mixing the 35W4 and the 50B5 in AA5 sets being a fire hazard. https://frank.pocnet.net/sheets5.html