01-01-2009, 02:10 PM
Hi Kevin, and welcome.
I hope you ordered the schematic and service info from Chuck Schwark's web site...I do not sell schematics. You will be pleased with the info you receive from Chuck.
I only see a few production changes in this model, and the info you get from Chuck will include all of this. Nevertheless, for now let's discuss a couple of these.
Resistor (41) was changed from 33K, 1/2 watt to 100K, 1/2 watt.
Capacitor (45), .01 uF (not .001) was changed to .003 uF.
You should recap to match the schematic, with the two exceptions noted above.
The radio would work without capacitor (57), but you should put one back in.
The radio will not work as well without capacitor (55). Without this capacitor, one of the Type 41 tubes will not be receiving any audio signal. Be sure you reinstall this one.
I hate to tell you this, but you have the Philco chassis that is, in my opinion, one of the most difficult Philco chassis to service; the others being the 41-285's siblings, including Models 41-250, 41-255, 41-280, 41-287 and 41-290. Not because of the capacitor replacements; but because of that crumbling rubber insulation on the wiring. That insulation should be replaced for safety and reliability. This is not a job for a novice; it will be difficult, and time consuming. Beware especially the wiring attached to the band switch. This is the hardest part.
Good luck.
I hope you ordered the schematic and service info from Chuck Schwark's web site...I do not sell schematics. You will be pleased with the info you receive from Chuck.
I only see a few production changes in this model, and the info you get from Chuck will include all of this. Nevertheless, for now let's discuss a couple of these.
Resistor (41) was changed from 33K, 1/2 watt to 100K, 1/2 watt.
Capacitor (45), .01 uF (not .001) was changed to .003 uF.
You should recap to match the schematic, with the two exceptions noted above.
The radio would work without capacitor (57), but you should put one back in.
The radio will not work as well without capacitor (55). Without this capacitor, one of the Type 41 tubes will not be receiving any audio signal. Be sure you reinstall this one.
I hate to tell you this, but you have the Philco chassis that is, in my opinion, one of the most difficult Philco chassis to service; the others being the 41-285's siblings, including Models 41-250, 41-255, 41-280, 41-287 and 41-290. Not because of the capacitor replacements; but because of that crumbling rubber insulation on the wiring. That insulation should be replaced for safety and reliability. This is not a job for a novice; it will be difficult, and time consuming. Beware especially the wiring attached to the band switch. This is the hardest part.
Good luck.
--
Ron Ramirez
Ferdinand IN
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