07-23-2011, 08:04 PM
To add to Mr X's comments, Check the resistance from pin 6 of the 6SA7 to ground Should show a very low resistance. As you turn the bandswitch from band to band it should show a low resistance like an ohm or 2. If it high bandswitch is at fault.
Measure the resistance from pin 5 to ground. Should see 33K bandswitch shouldn't matter. If it doesn't read 33k replace the 33k grid leak resistor.
If you like I can take some pic's of my 18T if it will help you.
Terry
Measure the resistance from pin 5 to ground. Should see 33K bandswitch shouldn't matter. If it doesn't read 33k replace the 33k grid leak resistor.
If you like I can take some pic's of my 18T if it will help you.
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 "[-]")
