03-12-2011, 09:56 PM
>Am I right to assume that if there is a hum and it is the filter caps that the radio would have no volume control, the tone >would be steady, and the reading at the output of the speaker would be proportional to the turn-ratio for primary-secondary >windings?
Yes.
>It was mentioned in another post that the 50L6 tube (Beam Power Amp) which feeds to the speaker transformer could cause a >problem with loud humming if the internals were shorted. A resistance check on a broken 50L6 should then show a short for >two pins... excluding the heater element, of course, right?
Maybe... Sometimes the short will only show up when the tube is on, hot, and filament lit.
Terry
Yes.
>It was mentioned in another post that the 50L6 tube (Beam Power Amp) which feeds to the speaker transformer could cause a >problem with loud humming if the internals were shorted. A resistance check on a broken 50L6 should then show a short for >two pins... excluding the heater element, of course, right?
Maybe... Sometimes the short will only show up when the tube is on, hot, and filament lit.
Terry
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!
Terry
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
