04-07-2018, 09:28 AM
Ok next step would be measure the resistance from pin 1 to chassis and then pin 4 to the chassis at the 80 socket. Both should show high resistance like 7000 ohms or higher.
If that is ok then measure the resistance across pins 1 and 4 (the two fat ones) on the 80 tube's base (again not installed). Should see a very low resistance just a few ohms. If it's open (no resistance) the tube will need to be replaced as the filament is broken. With a dead tube you can carefully bust the glass off of it and unsolder the wires from the pins. This can be used for a spkr plug or a tube adapter at a later date.
GL
If that is ok then measure the resistance across pins 1 and 4 (the two fat ones) on the 80 tube's base (again not installed). Should see a very low resistance just a few ohms. If it's open (no resistance) the tube will need to be replaced as the filament is broken. With a dead tube you can carefully bust the glass off of it and unsolder the wires from the pins. This can be used for a spkr plug or a tube adapter at a later date.
GL
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
