52-542 problem

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52-542 problem

Radioroslyn
Phorum Expert

Posts: 7,286
Threads: 268
Joined: Dec 2009
City: Roslyn Pa

08-02-2014, 11:12 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, 11:15 PM by Radioroslyn.)

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52-542 problem - by tab10672 - 07-30-2014, 01:04 AM

RE: 52-542 problem - by Steve Davis - 07-30-2014, 11:38 AM

RE: 52-542 problem - by tab10672 - 07-30-2014, 03:29 PM

RE: 52-542 problem - by tab10672 - 07-30-2014, 05:09 PM

RE: 52-542 problem - by PAradiogeek - 08-01-2014, 03:24 PM

RE: 52-542 problem - by tab10672 - 08-01-2014, 05:38 PM

RE: 52-542 problem - by PAradiogeek - 08-01-2014, 07:26 PM

RE: 52-542 problem - by PAradiogeek - 08-01-2014, 07:31 PM

RE: 52-542 problem - by Radioroslyn - 08-02-2014, 11:12 PM

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