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116B cap substitution? - Printable Version

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116B cap substitution? - KCMike - 02-22-2016

 I have been slowly rebuilding the cap blocks and restuffing the paper caps on my 116B.
My question is can I use an .001 cap to replace the 1250uuf. cap? It is a typical tubular cap. #40 on the schematic which says it is a .00125. It is connected btwn. the 77det. and 76 osc. cathodes. Thanks

RE: 116B cap substitution? - gregb - 02-22-2016

If you have a capacitance meter you could hand select from your stock and get one as close to .00125 as possible or a 1200pf in parallel with a 50pf would do the job just dandy.

Gregb

RE: 116B cap substitution? - Radioroslyn - 02-22-2016

I'd be a little surprised if it is a paper cap. Typically if the value is  in the uufd or mmfd and that it's in the rf section I'd bet it's a mica or perhaps a tubular ceramic.
Value wise don't know that you need to be dead on as it's coupling the osc output to the mixer. 50pf or so +/- probably isn't going to matter.
I would leave it. Not much voltage there, if it's shorted or or open it will cause the mixer to work won't burn out anything.

Terry

RE: 116B cap substitution? - KCMike - 02-22-2016

Thanks for the replies. that's what surprised me its a tubular paper cap about 2inches long. the part# on the cap is 30-4336p. I couldn't find that 3 on the philco capacitor parts value list. I was hoping to restuff it like the others. It is part number 40 on the schematic. I will try to post a picture.

RE: 116B cap substitution? - KCMike - 02-22-2016

Here is a pic of the under chassis. It is the cap at about 11 o'clock straight up from the large wire wound resistor
[Image: http://i1336.photobucket.com/albums/o654/220kohms/philco%20116B/DSC00830_zpsymnw4vzf.jpg]

RE: 116B cap substitution? - Crist Rigotti - 02-22-2016

I used a .0015uf tubular from Just Radios in my 116X restoration.

RE: 116B cap substitution? - KCMike - 02-22-2016

Thanks Crist. I Think I will just leave it in for now like Terry suggested and make a note so if I encounter problems later I can revisit it. Side note; really enjoy working on this one.

RE: 116B cap substitution? - doug-5er - 02-24-2016

(02-22-2016, 09:23 PM)Mike Wrote:  Thanks Crist. I Think I will just leave it in for now like Terry suggested and make a note so if I encounter problems later I can revisit it. Side note; really enjoy working on this one.

Gotta love those tar filled beauty's. Finished my 16B cath awhile back 13 all total. Icon_crazy