01-07-2022, 09:35 PM
Since you have a variac put the chassis sw in hi and set the filament voltage at the 80 for 5v using the variac. This could get your voltage to fall into place or pretty close. The 26's should be 1.5vac and the 27 2.5ac. The 71A's are 5vac but they are NOT connected to the same winding as the 80 tube. As mention the 80 as 200vdc or so on it's filament and the 71A's won't work under that situation.
RCA sez max plate voltage for the 71A is 180v. If you can get the hv to 170-175v I'd call it good. That would leave the 26's at 80 some volts and that ok too.
RCA sez max plate voltage for the 71A is 180v. If you can get the hv to 170-175v I'd call it good. That would leave the 26's at 80 some volts and that ok too.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got it!
Terry
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