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Just to get it out of the way , the aerovox cap and the blue one next to it , as well as the two red ones , are replacements and not native to the set . I figured you already know that but in case you didn't it's worth mentioning .
As to the power supply caps , anytime I see an 80 rectifier (or it's many revisions , the 5Y3 , 5U4 , etc) I always go with 450 volt caps as a matter of routine . My reasoning is that the 80 has directly heated cathodes and pretty much instantly begins passing voltage to the filter caps , while in many radios the indirectly heated cathodes of the rest of the tubes take a few seconds to heat up to where the tubes begin conducting , and begin loading the power supply down to it's normal running voltage . During that warm up time the B+ can shoot up quite high till the rest of the circuits begin drawing power , and that initial turn on spike is why I'd use 450V caps even though while running it looks like around 225 V is the highest B+ voltage listed on the schematic . In running tests you may not see all that big of a voltage difference with your radio since the output 47 tube is also a directly heated cathode , and will come on as instantly as the rectifier , the biggest warmup B+ drop will be noted with indirectly heated audio output types like the 6V6 , 6L6 , etc .
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01-01-2021, 01:24 PM
Hybrid Mode
