The PHILCO Phorum
41-280 pictures and question - Printable Version

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41-280 pictures and question - Elrick - 01-17-2010

I just finished ordering my capacitors, found all I needed except a 0.003 mF 1000V, closest I could find was a 0.005 mF 1000V. Do you think that would be suitable or should I search for a better match? Not sure if my pictures are linked correctly but I'll give it a go. Excited to get to work, this chassis is less crowded than my last project the venerable Hallicrafters S-38.


[Image: http://i103.photobucket.com/albums/m140/Elrick_02/Radio/DSC_0514_1045-1.jpg]

[Image: http://i103.photobucket.com/albums/m140/Elrick_02/Radio/DSC_0502_1036-1.jpg]

[Image: http://i103.photobucket.com/albums/m140/Elrick_02/Radio/DSC_0513_1044-1.jpg]

Look closely at the short yellow wire looped through the top of the tuning cap. It's not sodered to anything, just loops through and ends there. Is that correct?


[Image: http://i103.photobucket.com/albums/m140/Elrick_02/Radio/DSC_0509_1043-1.jpg]

Re: 41-280 pictures and question - Radioroslyn - 01-17-2010

Hi Elrick,
What is the number of the cap on diagram? Generally speaking you should be fine. I'm a little surprised that it uses a 1kv cap as the chaiss voltage is about 250v. Sometimes you will find them in the plate circuit of the audio output stage as those caps need to be rated at the high volt + the audio voltage. The unsoldered wire though the tuning condenser is normal.
Terry

Re: 41-280 pictures and question - Elrick - 01-18-2010

Thanks for the repy Terry. The 1 kv cap in question is listed as part number 49 on the Philco Service Bulletin for this radio. On the schematic I see it lives in the second detector circuit between the 2nd det -AVC 1st audio (7C6 tube) and the tone control part no 44. I was suprised to see such a high voltage for that cap but what do I know. Lets all have a good MKL day.

Re: 41-280 pictures and question - Ron Ramirez - 01-18-2010

Hi Elrick

You do not need a cap rated at 1000 volts to replace part (49). The plate of the 7C6 will have less than 100 volts on it. Use a 0.0033 uF cap rated at 600 or 630 WVDC. It is part of the tone control circuit.