DuMont RA-108 Mansfield inductuner

[bigaudioal]

Originally Posted by Gregb

Did you get that correct, the plate voltage is -140v? There is no way that tube will work with a negative voltage on the plate. Have to try and figure out why it is negative.

Gregb

Sorry, should not have used a "-" before listing voltages. That is 140 vdc. Not negative.

[vts1134]

Did you check R23 (the grid leak resistor)?

[bigaudioal]

Originally Posted by vts1134

Did you check R23 (the grid leak resistor)?

I did check R23. It was almost dead on 12K, as it should be. All the resistors inside the tuner were good.