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40-155 Unusual buzzing
Chuck Schwark
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#4

03-14-2006, 03:39 PM
Look for loose/rusted rivet ground points, heater wires not dressed/routed near grids, etc.

Could also be some heater-to-cathode leakage in a tube too.

Be sure the NEG side of the first electrolytic off the rectifier goes to the HV center tap and not ground.
Chuck Schwark,
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Messages In This Thread
40-155 Unusual buzzing - by Guest - 03-14-2006, 11:22 AM
[No subject] - by Chuck Schwark - 03-14-2006, 12:52 PM
[No subject] - by Guest - 03-14-2006, 03:19 PM
[No subject] - by Chuck Schwark - 03-14-2006, 03:39 PM
[No subject] - by gary rabbitt - 03-23-2006, 01:19 PM



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