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Antique Radio Technical Forum
Philco 90 Where to begin?

Posted by Chuck Schwark on 02/27/2004 09:23

:All tubes lit, volume and tone have no effect. No sound
:but a low hum.
:Where to begin?

First, do not plug the set in (or again). Without replacing the electrolytic filter caps, you can cause more damage to the set.

Next, replace all the wax-paper caps. These can also be "hiding" in the bakelite blocks and metal-cans and tone control assembly. See the bakelite block re-buiilding info on my site:

http://www.philcorepairbench.com/capbuild.htm

Also check all the resistors for proper values. Replace any that are outside the +/-20% tolerance.

Check all RF and IF coils and audio transformers for continuity. You may find one or more open.

Regards,

Chuck Schwark
The Philco Repair Bench



Philco 90 Where to begin? 
Scott 02/26/2004 20:53 
Chuck Schwark 02/27/2004 09:23 
Steven in Oregon 02/28/2004 05:31 

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