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37-690 rectifier flash / arc
35Z5
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Posts: 184
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Joined: Feb 2018
City: Chesapeake VA
#8

01-12-2019, 06:25 PM
The 5X4 is basically a 5U4 with different basing. It has approx double current rating of 5Y4(which has same ratings as 5Y3). The 5Y4 is not a good sub but I'd think it's at least power up radio. If the arc occurs with other tubes removed, there is a short in P/S(my bet).

You can measure resistance across 1st filter cap, if it isn't several hundred ohms, there is a short in P/S.
Tom
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Messages In This Thread
37-690 rectifier flash / arc - by mr.jukebox - 01-10-2019, 07:23 PM
RE: 37-690 rectifier flash / arc - by Ron Ramirez - 01-10-2019, 07:47 PM
RE: 37-690 rectifier flash / arc - by Phlogiston - 01-10-2019, 07:54 PM
RE: 37-690 rectifier flash / arc - by mr.jukebox - 01-10-2019, 08:05 PM
RE: 37-690 rectifier flash / arc - by Ron Ramirez - 01-10-2019, 08:06 PM
RE: 37-690 rectifier flash / arc - by morzh - 01-10-2019, 09:16 PM
RE: 37-690 rectifier flash / arc - by tbone - 01-12-2019, 07:32 AM
RE: 37-690 rectifier flash / arc - by 35Z5 - 01-12-2019, 06:25 PM



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