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Philco 42-123
RodB
Phorum Expert
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Posts: 990
Threads: 40
Joined: Feb 2015
City: Roseville, MN
#19

10-13-2021, 04:20 PM
You can touch the control grid pin of each of the audio amplifiers with a screwdriver or alligator lead. This will inject a 60 cycle signal to the grid and the speaker should respond with the hum.
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Messages In This Thread
Philco 42-123 - by texan george - 10-01-2021, 02:15 PM
RE: Philco 42-123 - by admin - 10-01-2021, 03:12 PM
RE: Philco 42-123 - by morzh - 10-01-2021, 06:15 PM
RE: Philco 42-123 - by Radioroslyn - 10-01-2021, 07:45 PM
RE: Philco 42-123 - by morzh - 10-01-2021, 09:57 PM
RE: Philco 42-123 - by Radioroslyn - 10-02-2021, 06:19 AM
RE: Philco 42-123 - by MrFixr55 - 10-02-2021, 09:17 AM
RE: Philco 42-123 - by texan george - 10-02-2021, 03:55 PM
RE: Philco 42-123 - by texan george - 10-04-2021, 09:44 PM
RE: Philco 42-123 - by Radioroslyn - 10-04-2021, 11:30 PM
RE: Philco 42-123 - by texan george - 10-05-2021, 11:36 AM
RE: Philco 42-123 - by texan george - 10-10-2021, 09:43 AM
RE: Philco 42-123 - by Radioroslyn - 10-10-2021, 12:34 PM
RE: Philco 42-123 - by radiorich - 10-10-2021, 12:51 PM
RE: Philco 42-123 - by texan george - 10-10-2021, 02:28 PM
RE: Philco 42-123 - by texan george - 10-13-2021, 01:17 PM
RE: Philco 42-123 - by mikethedruid - 10-13-2021, 02:18 PM
RE: Philco 42-123 - by texan george - 10-13-2021, 03:35 PM
RE: Philco 42-123 - by RodB - 10-13-2021, 04:20 PM
RE: Philco 42-123 - by texan george - 10-15-2021, 01:37 PM
RE: Philco 42-123 - by Radioroslyn - 10-15-2021, 03:41 PM
RE: Philco 42-123 - by texan george - 10-16-2021, 04:22 PM
RE: Philco 42-123 - by morzh - 10-16-2021, 08:38 PM
RE: Philco 42-123 - by texan george - 10-24-2021, 05:10 PM
RE: Philco 42-123 - by MrFixr55 - 10-24-2021, 09:44 PM
RE: Philco 42-123 - by texan george - 10-26-2021, 01:50 PM



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