Quote:
Originally Posted by kramden66
In this set the electrolytics are 475 volts , i have a feeling that a 450 volt would be ok its just the start up voltage may go at or above 450 volts and then drop thats why they have 475 volt caps in there , i could always order 500 volt caps but just for testing and getting the set up and running i was going to double the caps using two 450 volt caps making it 900 volts handling , so that would be way over whats needed but the caps would be ok .
the dumont ra-103 , ra-103D and ra-110 all use a couple capacitors in series with 100k resistors on them , designers put that in to avoid a higher voltage capacitor.
mike
|
Or what I've done in certain cases with fast-warming B+ rectifier tubes or solid state B+ supplies, is to modify the B+ supply to include a delay relay, so as the filaments are all up before the B+ comes on. That shortens the duration (or eliminates) the unloaded high B+ surge on startup.
Charles