06-24-2017, 01:09 PM
Hi Pear and Welcome,
Sounds like #1 ( 1/2 of the volume control) or #34 is open. Simple test is measure the resistance from the cathode to chassis gnd, should see with volume control full up abt 250 ohm. Set unplugged of course.
http://www.philcoradio.com/images/phorum/schem/51.jpg
GL
ps Didn't read your full post to answer your question Yes it's a very good possibility. Under normal conditions a shorted tube wouldn't deliver HV to the cathode w/o either showing a low plate voltage or smoking the cathode resistor. In your case the cathode circuit is open.
Sounds like #1 ( 1/2 of the volume control) or #34 is open. Simple test is measure the resistance from the cathode to chassis gnd, should see with volume control full up abt 250 ohm. Set unplugged of course.
http://www.philcoradio.com/images/phorum/schem/51.jpg
GL
ps Didn't read your full post to answer your question Yes it's a very good possibility. Under normal conditions a shorted tube wouldn't deliver HV to the cathode w/o either showing a low plate voltage or smoking the cathode resistor. In your case the cathode circuit is open.
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 "[-]")
