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635 Tombstone
Ron Ramirez
Silent Key
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Posts: 13,776
Threads: 580
Joined: Sep 2005
City: Ferdinand State, Province, Country: Indiana
#5

04-20-2015, 07:11 AM
The center tap of the power transformer's high voltage secondary is the most negative point in the radio. Let us refer to this point as B-. Because of the bias resistor (70), the chassis is actually slightly positive with respect to the high voltage secondary center tap.

All three sections of (67) have their negative leads going to B-. The 10 uF section of (67) only needs to be 50 WVDC, and its positive lead does connect to ground. The two 8 uF sections of (67) can be replaced with 10 uF caps, and they should be rated at 450 WVDC.

As for cap (52), yes, the negative lead goes to ground.
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Ron Ramirez
Ferdinand IN
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Messages In This Thread
635 Tombstone - by Warren - 04-12-2015, 06:49 PM
RE: 635 Tombstone - by klondike98 - 04-12-2015, 07:06 PM
RE: 635 Tombstone - by Warren - 04-12-2015, 10:02 PM
RE: 635 Tombstone - by Warren - 04-20-2015, 02:19 AM
RE: 635 Tombstone - by Ron Ramirez - 04-20-2015, 07:11 AM
RE: 635 Tombstone - by Warren - 04-20-2015, 04:09 PM
RE: 635 Tombstone - by Warren - 04-22-2015, 11:41 PM
RE: 635 Tombstone - by Warren - 04-23-2015, 11:12 PM
RE: 635 Tombstone - by Steve Davis - 04-23-2015, 11:22 PM
RE: 635 Tombstone - by Warren - 04-25-2015, 12:52 AM



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  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration