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42-380 tone controls
Chuck Schwark
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Posts: 1,703
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Joined: Sep 2005
City: Evanston, IL
#2

10-07-2005, 03:39 PM
Looking at the schematic, the TREBLE control should always have some effect, unless pot #53 is bad/open. The cap in series with this control should be replaced. It will be leaky or shorted.

The TREBLE pot could have been damaged in the past if leaking caps #51 and 52 allowed B+ current to pass through the pot as well, burning it.

The BASS tone circuit (loudness compensation as well) will have less effect if the volume pot has been changed out and is not a tapped type.
Chuck Schwark,
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42-380 tone controls - by Guest - 10-07-2005, 03:14 PM
[No subject] - by Chuck Schwark - 10-07-2005, 03:39 PM



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