42-761EZ Chassis Restoration - Printable Version
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RE: 42-761EZ Chassis Restoration - Arran - 02-20-2013
I think that there may be some conductive crap in one of the trimmers, a mixture of dirt, rust, and mouse pee pee. Believe it or not I usually wash chassis when they get very dirty, TSP is very good and getting rid of dirt and oxidation in things. The problems you are having with this 42-761EZ are precisely the sort of problems I would expect to find in that rusty 38-690 that was on fleabay, except that one had evidence of some very pitted aluminum parts as well as rust.
Regards
Arran
RE: 42-761EZ Chassis Restoration - Ron Ramirez - 02-21-2013
I think you're absolutely right, Arran.
Let's consider which components are band specific - and that would be only the trimmers for each of the five "spread bands" (31M, 25M, 19M, 16M, 13M). So whatever is causing 31M to not operate properly - and causing 25M to not work at all - must be limited to components for those individual bands, and that leaves the trimmers for those bands.
The permeability tuning for those five bands use the same coils; different trimmers are switched in by the band switch in parallel with these coils to make it work on the different bands.
It's beginning to look like I am going to have to remove the RF assembly, which appears to be removable - but does not look to be an easy task.
RE: 42-761EZ Chassis Restoration - Radioroslyn - 02-21-2013
D Grimes speaking from the grave!!!
Terry
RE: 42-761EZ Chassis Restoration - Chuck Schwark - 02-21-2013
Sounds like you have the culprits in sight...and remember Ron, no good deed goes unpunished.
Murphy
RE: 42-761EZ Chassis Restoration - Ron Ramirez - 02-21-2013
Oy vey!
[Image: http://www.philcoradio.com/images/phorum/ARF/Disgust.jpg]
RE: 42-761EZ Chassis Restoration - Chuck Schwark - 02-22-2013
"Mr. Crusher, please take us out of orbit...one quarter impulse"