12-10-2019, 03:12 PM
>I don't know what's going on
Really should rebuild the 7 electrolytic caps before you turn the set on.
>is there a way to test those older tubes without a tube tester?
You can test the heater but that's abt it. That doesn't tell you much abt the performance of the tube just whether it's dead or not.
Something to have a look at is check the resistance across the spkr plug. Use any two pins but measure all of them. If you see a measurement above 5K or so investigate the primary winding of the output transformer. Not a bad idea to do likewise driver transformer (the one over by the single 42 tube). Primary has two connections and the 2ndy has three. Measure the two windings separately.
Really should rebuild the 7 electrolytic caps before you turn the set on.
>is there a way to test those older tubes without a tube tester?
You can test the heater but that's abt it. That doesn't tell you much abt the performance of the tube just whether it's dead or not.
Something to have a look at is check the resistance across the spkr plug. Use any two pins but measure all of them. If you see a measurement above 5K or so investigate the primary winding of the output transformer. Not a bad idea to do likewise driver transformer (the one over by the single 42 tube). Primary has two connections and the 2ndy has three. Measure the two windings separately.
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
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
