Dumont RA-109 questions if anyone has one

[cbenham]

Originally Posted by kramden66

Also the 1.75 @ 60~ 850 volts capacitor , that is 1.75 uf ? since it is a big transmitter oil filled type its probably still good ? i will check it , if not good whats a good way to replace it ?

mike

This resonating capacitor is part of the power transformer circuit. The power transformer is made by Sola and is a constant voltage ferroresonant transformer. The capacitor is selected at the Sola factory to work with *THIS* transformer.
If you have normal B+ it is working.
Attempting to replace the cap won't make it work any better. If it's bad you'll know it because there will be no B+ at all. Here is some information on how these transformers work...
http://www.powerqualityworld.com/201...oresonant.html

Cliff