01-10-2011, 03:21 AM
Congrats!!
I was thinking that the plate voltage on the IF amp tube was a bit high which could indicate an open cathode circuit. With the cathode open or too high or a resistance the 6K7 won't draw much plate current as it should and won't amplify. It will just sit there and look pretty and fool you.
As for your 6F6 Steve in correct I does run pretty hot. For laughs take your voltmeter and connect the - lead to pin 8 and the + lead to pin 5 of the 6F6. What you should see is about -10 or -15vdc (grid bias) If not you've got a problem in the bias side of the power supply or a bad coupling condenser.
The SW problem maybe a dirty bandswitch. Try a bit of DeOxit to clean it up. Apply sparingly. Caution!! After cleaning be sure the switch is totally dry before applying power to the set. If not your bandswitch wafer could burst in to flames. Don't ask me how I know. It's very unpleasant replacing a bandswitch!
Thank for the update
Terry
I was thinking that the plate voltage on the IF amp tube was a bit high which could indicate an open cathode circuit. With the cathode open or too high or a resistance the 6K7 won't draw much plate current as it should and won't amplify. It will just sit there and look pretty and fool you.
As for your 6F6 Steve in correct I does run pretty hot. For laughs take your voltmeter and connect the - lead to pin 8 and the + lead to pin 5 of the 6F6. What you should see is about -10 or -15vdc (grid bias) If not you've got a problem in the bias side of the power supply or a bad coupling condenser.
The SW problem maybe a dirty bandswitch. Try a bit of DeOxit to clean it up. Apply sparingly. Caution!! After cleaning be sure the switch is totally dry before applying power to the set. If not your bandswitch wafer could burst in to flames. Don't ask me how I know. It's very unpleasant replacing a bandswitch!
Thank for the update
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
