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Philco Model 41-296X with 41-285 modified chassis
#57

Ron Ramirez Wrote:Okay, now we're getting somewhere. You say you replaced the input filter capacitor (62), Philco part number 30-2474, with a 10 uF, 160 volt unit. Big mistake! 160 volts is much too low a voltage rating for this capacitor! According to the schematic, 265 volts is being applied across this capacitor when in operation. And, keep in mind that those voltages were measured with 1941 or older vintage test equipment which is not as accurate as today's high impedance multimeters; so that 265 volts is probably more like 280 or 290, given today's more sensitive meters and higher line voltages.

I would bet that this capacitor shorted since it was only rated at 160 volts, and the short took out the power transformer since this is the input filter.

Replace it with a new electrolytic rated at 10 uF, 450 volts.

It will not matter if you replaced electrolytic (27) with 22 uF, although 10 uF would have been a better choice. Replacing the 16 uF (27A) with a 22 uF was the right thing to do. You say the new ones were rated at 450 volts, so all should be OK there.

I have a 41-285 that I'm going to restore. I've been scouring this forum and without it I don't believe I would or will be successful. Anyways my question is I was looking at the schematic for the radio and it says that capacitor (62) was 12 uF. I thought I read that you should go up and not down in ratings. Should I get a 10 uF or would the 22 uF be better as Ron suggested the 10?

I just want to get this right as I have only begun this journey.

Dan


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Re: Philco Model 41-296X with 41-295 modified chassis - by dfields - 11-16-2010, 04:19 PM



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