Philco 42-1012 Alignment - Printable Version
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+--- Thread: Philco 42-1012 Alignment (/showthread.php?tid=12114)
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RE: Philco 42-1012 Alignment - Eliot Ness - 04-29-2015
Congratulations
Seems like more and more some mica caps are hard to assume as being good.
RE: Philco 42-1012 Alignment - Ron Ramirez - 04-29-2015
Yup, the radios, their components, and their caretakers are just getting older every day.
I've been replacing carbon resistors as a matter of course in a restoration for several years now. In recent years, I've started automatically replacing common value micas (100 pF, 250 pF) as well.
I think this problem will only get worse over time...
"Keep 'em Flying"
RE: Philco 42-1012 Alignment - sleuth255 - 04-29-2015
Nicely done! I've been watching this one b/c I noticed the same symptom on SW started cropping up on my 41-616 too. WWV (my alignment reference for all 3 SW bands) started coming in multiple times on approximately 1 MHZ steps and I easily re-created it with my signal generator. Could you let me know which ones specifically that you replaced so I can cross-reference? Thanks!
RE: Philco 42-1012 Alignment - codefox1 - 04-29-2015
Recarb and Recap, I'vebeen trying to coin the first for a while, and I don't sell any or 'em.
RE: Philco 42-1012 Alignment - vecher - 04-30-2015
All, Ok the Caps I replaced to make this work were.
All Mica..
Part # 27 185 uuf Replaced with a 180 uuf
Part # 23 185 uuf Replaced with a 180 uuf
Part # 20 250 uuf Replaced with a 270 uuf
Part # 29 185 uuf Replaced with a 180 uuf.
Not sure which one or a combo of them cured the alignment problem. Most of these have to do with either the OSC coil Part # 24 or the Osc tube 7C5.. See schematic for part # and location..
Skip..
RE: Philco 42-1012 Alignment - Edisla - 05-11-2015
Did you happen to have those on hand or did you order?
Curious since the time you started to investigate to the time you fixed it was only a few days.
If you ordered them and received them that quickly where did you order from?
RE: Philco 42-1012 Alignment - vecher - 05-11-2015
I had them on hand. Normally you do not have to replace Mica Caps. But looks like these old radios some if not all of the caps drift. Do you have a capacitor meter? easier to check caps around your Osc tube then trying to replace all of them.. Mine were way out of spec..
Skip...
RE: Philco 42-1012 Alignment - Edisla - 05-11-2015
I do have a cap tester. Its old and don't recall what ranges it does. I'll check when I get home.
Found what I have online. I have the Simpson 383A.
RE: Philco 42-1012 Alignment - vecher - 05-11-2015
Ok that should work good. Be careful as it has High voltage. Get hold of a manual in case you don't have one and learn how to use it.. If you don't already know..
Post what you find out
Skip...