Philco 38-12

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Philco 38-12

Post by Ben Delk on Fri Nov 30, 2012 12:56 pm

I have a Philco 38-12 in great shape even plays very well but I'm giving it to a friend for Christmas so I want to replace the caps.

• The Philco 38-12 has to electrolytic caps, one 4 mfd-450v, one 12 mfd-450v.


• The 12 mfd has a cardboard or paper type insulator wrapped around the bottom of the metal
can where it is attached to the chassis. I’m assuming this is to insulate the metal housing from chassis ground.
It has a center tap which I take as positive feed and there is also a spade clip sticking out of the
bottom which I assume to be negative.

• The 4 mfd has a center tap only so I assume that means the metal housing is chassis grounded.


• The question here is “what is the best way to replace the caps putting them under the chassis?”

• Leave the 12mfd metal case in place but cut the wires going to the center tap (+), attach a new
electrolytic cap (+) to those wires and the negative side of the new cap to the spade of the old cap? Right, wrong or better idea?

• Leave the 4mfd, remove the 2 wires connected to the center tap (+), connect the new cap (+) to the wires and the negative to chassis ground? Right, wrong, better idea?

• Also, besides ordering dial string, what’s a good replacement that holds up to time?

http://www.nostalgiaair.org/Resources/236/M0013236.htm
http://www.servimg.com/image_preview.php?i=92&u=17421296
http://www.servimg.com/image_preview.php?i=93&u=17421296


Thanks in advances for help, suggestions and guidance.
Ben


Last edited by Ben Delk on Sat Dec 01, 2012 10:45 am; edited 1 time in total
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Re: Philco 38-12

Post by Guest on Fri Nov 30, 2012 6:27 pm

For dial cord, I would bet the longest lasting would be cotton, but I don't think you could find cotton these days. Nylon is the predominant material for cord now. If you don't have a supplier, do a net search for dial cord.

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Re: Philco 38-12

Post by Ben Delk on Fri Nov 30, 2012 6:53 pm

Stopped by a shoe repair shop today and picked up a small roll (25 ft.) of wax cotton shoe sole twine. Perfect size and I have already put it on. Worked great. Thanks
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Re: Philco 38-12

Post by Guest on Fri Nov 30, 2012 7:06 pm

When I see ads for stores selling Spanish-american war surplus haversacks it makes me think cotton should hold up a while! Smile

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Re: Philco 38-12

Post by Ken g on Fri Nov 30, 2012 8:45 pm

Your average fishing store should have cloth type string that is basically the same as tuning string .

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Re: Philco 38-12

Post by Bill Cahill on Fri Nov 30, 2012 10:05 pm

Actually, nylon string holds up better. Some dials put too much tension on cotton, and, it breaks.
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Re: Philco 38-12

Post by Ben Delk on Sat Dec 01, 2012 4:07 pm

Well I decide to add a terminal block, cut the 4 mfd loose at the center tap, connect to the terminal strip, attach a 4 mfd to that and the negative end to the chassis. Cut the 12 mfd loose at the center tap, move the wire to the terminal strip. Left the old cap in place as a connector for the negative side of the new 12 mfd. All is good. I've decide that removing the old metal can, opening them and stuffing the new caps is more trouble than it is worth. That is unles there is simply not enougn room to add them on the bottom side.

http://www.servimg.com/image_preview.php?i=94&u=17421296
http://www.servimg.com/image_preview.php?i=95&u=17421296


I'll post the final picture when I finish the cleanup and close it up.
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Re: Philco 38-12

Post by Bill Cahill on Sat Dec 01, 2012 5:01 pm

No problem from me.......... Leaving the old one in as a shelf queen to show what it looked like new is acceptable.
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Re: Philco 38-12

Post by Ben Delk on Sat Dec 01, 2012 7:13 pm

Here's the finished the Philco 38-12. Fun project.

http://www.servimg.com/image_preview.php?i=94&u=17421296
http://www.servimg.com/image_preview.php?i=97&u=17421296
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Re: Philco 38-12

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