The PHILCO Phorum

I am restoring a Philco 37-624 6VDC battery set.
The vibrator supply has 3 metal encased .5uf capacitors that I need to re stuff. What voltage can I use with these caps? 1000 and 1600 volt units are too big to fit in the metal cans which are only about 1/2 inch diameter.
The Philco schematic numbers are numbers 72, 75 & 76. The part numbers for all is 30-4296 - Condenser(.5uf metal case). Any help would be appreciated.

FYI, if you are restoring one of these, don't forget to replace the buffer cap located across the the input of the transformer (part number 30-4381 .01uf. I used a sprague 1600 volt unit for this. Replacement requires you to take apart almost all the wires and caps in the vibrator supply to get access. This means removing all the screws to remove the transformer and lay open the vibrator socket. Lots of fun. Enjoy.

Gerald

What I'm seeing is the two on the bottom are a hash filter to keep the vibrator noise out of the filament circuit. The one above it is the same but in the hv circuit. The common voltage rating would be 200v. The hv output is 135v so 200v should be fine for this application. If you have any doubts you can take a look at the cap closest to the vibrator w/a scope and look for large voltage spikes.

Hi,

Thanks for the response. That helps. I will use my go to caps of 630 volts and they will easily fit inside the small cans. Now for the fun part of de-soldering the bottoms and removing the guts and the tar. Thanks for the help. FYI, I built a solid state vibrator circuit that was posted on a thread a while back. It works great, no hash and a nice square wave. the DC output is about 140 volts and the two rectifier diodes eliminates the other contacts. I put it in a jiffy box that screws down replacing old vibrator can cover, so it is can be removed to replace with the original vibrator if I wanted.
Now I just need to find some non-polorized electrolytic caps to restuff the filter cans.

Thanks again for the help,
Gerald