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 Post subject: An "extra" capacitor in a Philco 60
PostPosted: Nov Tue 21, 2017 1:34 pm 
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Location: Groveland MA
Hi folks,

I am working on a Philco 60, judging by the cabinet style and some documentation found inside I believe it to be a second generation made in 1933 or 34.
There is a metal can that according to the schematic contains 4 capacitors. (See item 20 on full schematic); http://www.nostalgiaair.org/pagesbymode ... 013793.pdf

I have found that there are 5 caps inside rather than the 4, and have not found any information about the fifth. Below is a screen shot of a section of the schematic. I have positively identified 4 wires coming out of the can as going to locations A, B,C, and D as indicated in the drawing. The fifth cap goes to the junction of C8 and R9 (C8 is enclosed in a bakelite block, just visible in the upper right of the screenshot). I should add that when I took the cap pack apart there was a ground wire going from the base of each of the 5 caps to the can, the can being screwed into the chassis.

The "extra" cap measures about 0.25uf. Perhaps the schematic is later than 1933 ish, and the 5th cap was removed in later production? I plan putting a similar value cap in its place, but I am curious if anyone has run across this before.

Thanks,

Russ


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 Post subject: Re: An "extra" capacitor in a Philco 60
PostPosted: Nov Tue 21, 2017 1:54 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Warren, Ohio, USA
From Ron Ramirez’s Philcoradio.com, this should help explain:
http://philcoradio.com/phorum/showthread.php?tid=15007

Steve Chambers


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 Post subject: Re: An "extra" capacitor in a Philco 60
PostPosted: Nov Tue 21, 2017 2:18 pm 
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Joined: Jan Tue 31, 2012 1:55 am
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Location: Mountains of Mourne. Ireland.
Model 60 went through many production runs.
http://web.archive.org/web/201603160007 ... 60evol.htm

The fifth section of 30-4063 .2μF was first employed in Run-three.


In Run-seven.
"Filter Condenser Block (20), Part No. 30-4063, changed to Part No. 30-4217. The new block has four condensers instead of five; the 0.2 uF section having been removed. One 0.09 uF section of the block is now connected between the 6A7 cathode and ground".

For the capacitors complete specifications...
search for 30-4063 on this page using keyboard shortcut
Ctrl+F on a PC Cmd+F on a Mac
http://web.archive.org/web/201604050107 ... talcap.htm

Greg.


Edit: Bakelite Block Capacitors.
http://web.archive.org/web/201603242327 ... lokcap.htm

Bakelite Block Rebuilding.
https://web.archive.org/web/20170227112 ... pbuild.htm

Recommended replacement procedure by Gary Breaux.
http://itsmegfb.tripod.com/id16.html

Additional Philco Bakelite Block Capacitor Data.
http://web.archive.org/web/201603182211 ... blocks.htm
download linked pdf (service bulletin 289)


and... not to tempt providence... :)
60Hertz hum in Philco model 60: http://web.archive.org/web/201607311403 ... ctip12.htm


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 Post subject: Re: An "extra" capacitor in a Philco 60
PostPosted: Nov Tue 21, 2017 3:48 pm 
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Joined: Aug Mon 20, 2012 12:23 pm
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Location: Groveland MA
Steve, and egg, thanks very much!
Clearly my google searching skills need improvement.

Happy TG,

Russ

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 Post subject: Re: An "extra" capacitor in a Philco 60
PostPosted: Dec Wed 06, 2017 5:17 pm 
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Joined: Feb Sun 01, 2015 9:37 pm
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Location: Laflin, PA
Thanks for posting this info! I could have used this a few months ago when I was working on a Tombstone 610. I cobbled the info I needed but this would have been a good to have for sure.

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73's WA3TVH


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