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IF oscillation in Philco 38-12
cwc
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Posts: 6
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Joined: Nov 2015
City: Pine Island, MN
#8

11-19-2015, 12:06 AM
There is some progress.  I've replaced all the caps except the two on the primary side of the power xfmr, replaced a couple of resistors (not the 39K in the photo below) and found an intermittant short in one of the diodes in the 2nd detector tube.  I'm running with just one anode of the 75 tube connected right now.

The IF is still a little unstable so I think I should do one of the fixes shown in the "changes" file mentioned above.  

It involves re-routing the wire in the photo that is marked with the arrow.  The Philco description is a little vague.  I don't want to re-invent the wheel here so if anyone has done this fix I'd appreciate any suggestions as to the best way to route the wire.  

[Image: http://i179.photobucket.com/albums/w290/...f0l4wz.jpg]
Charlie
(This post was last modified: 11-20-2015, 08:59 AM by cwc.)
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Messages In This Thread
IF oscillation in Philco 38-12 - by cwc - 11-12-2015, 10:55 AM
RE: IF oscillation in Philco 38-12 - by cwc - 11-13-2015, 10:27 AM
RE: IF oscillation in Philco 38-12 - by David - 11-12-2015, 09:15 PM
RE: IF oscillation in Philco 38-12 - by cwc - 11-13-2015, 10:29 AM
RE: IF oscillation in Philco 38-12 - by cwc - 11-19-2015, 12:06 AM
RE: New problem in Philco 38-12 - by cwc - 12-28-2015, 11:01 PM
RE: IF oscillation in Philco 38-12 - by cwc - 12-29-2015, 11:49 AM



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