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52-542 problem
Radioroslyn
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#9

08-02-2014, 10:12 PM
Check pin 4 of the 7A8 with a VTVM. Should read a small - voltage there like -1 to -3vdc. Also check for the 105vdc on pin 3. If not your osc is not working. Check T1 for open windings, open cathode resistor, or bad 47mmfd mica.
GL
Terry
(This post was last modified: 08-02-2014, 10:15 PM by Radioroslyn.)
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Messages In This Thread
52-542 problem - by tab10672 - 07-30-2014, 12:04 AM
RE: 52-542 problem - by Steve Davis - 07-30-2014, 10:38 AM
RE: 52-542 problem - by tab10672 - 07-30-2014, 02:29 PM
RE: 52-542 problem - by tab10672 - 07-30-2014, 04:09 PM
RE: 52-542 problem - by PAradiogeek - 08-01-2014, 02:24 PM
RE: 52-542 problem - by tab10672 - 08-01-2014, 04:38 PM
RE: 52-542 problem - by PAradiogeek - 08-01-2014, 06:26 PM
RE: 52-542 problem - by PAradiogeek - 08-01-2014, 06:31 PM
RE: 52-542 problem - by Radioroslyn - 08-02-2014, 10:12 PM



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