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 Post subject: PHILCO PREDICTA TV Capacitor Styles
PostPosted: Aug Fri 13, 2021 3:36 am 
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Hello.

Within this Philco PREDICTA Debutante Television
several of the component markings on the main board Capacitor's , has worn off with age.

The Sam's Photofact which I have does not list style / type in it's parts list. When I search on the manufacturer Partnumber in the PL , they come back not found , due to this units years.

How do you distinguish from Paper, Mica, Ceramic , Poly capacitor types on the main board of a Philco Predicta ?

cferry1


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 Post subject: Re: PHILCO PREDICTA TV Capacitor Styles
PostPosted: Aug Fri 13, 2021 4:34 am 
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Paper caps are made from paper and wax. If the cap has a wax coating, it's a paper cap.
Some paper caps were made in plastic tubes but these are rare and are generally coated with the tell-tale wax. If in doubt, pull it and leakage test it.

Generally speaking you don't replace mica, ceramic or poly caps unless there is a reason to do so. The only time you'd consider changing a mica cap is if it is in a circuit with 100 or so volts across it and it's more than 50 years old.

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Wax, paper, bitumen, cotton, high voltages - what could possibly go wrong?


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 Post subject: Re: PHILCO PREDICTA TV Capacitor Styles
PostPosted: Aug Fri 13, 2021 6:05 am 
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The paper caps will be values 0.001 and larger. Some are in cardboard tubes, some in white plastic, some in black plastic. Some are horizontal while some are mounted vertically.

The ceramic caps are small discs.

I don't think there are any mica caps.

Here's a photo of the main board with some of the paper caps in circled in red and one ceramic caps in purple. Most of the caps on this board are paper. There are no poly film caps.

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 Post subject: Re: PHILCO PREDICTA TV Capacitor Styles
PostPosted: Aug Fri 13, 2021 2:24 pm 
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Thank You For The Information


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 Post subject: Re: PHILCO PREDICTA TV Capacitor Styles
PostPosted: Aug Fri 13, 2021 3:10 pm 
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Not specifically in a Predicta but some typical capacitors that have a paper dielectric, and so should be replaced.

Attachment:
VintPaperCapE1.jpg
VintPaperCapE1.jpg [ 347.74 KiB | Viewed 1390 times ]

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 Post subject: Re: PHILCO PREDICTA TV Capacitor Styles
PostPosted: Aug Fri 13, 2021 6:31 pm 
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Nice Picture !


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 Post subject: Re: PHILCO PREDICTA TV Capacitor Styles
PostPosted: Aug Fri 13, 2021 11:34 pm 
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You'll want to replace those integrated networks while you have the board off.
Crist Rigotti was selling nice reproductions, not sure if he still is but he's on Videokarma and the Facebook group Club Predicta and others, he's a member here also.

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 Post subject: Re: PHILCO PREDICTA TV Capacitor Styles
PostPosted: Aug Sat 14, 2021 1:52 am 
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Yes, those "couplates" are a good idea. It is so much hassle getting the circuit boards free of the metal chassis you don't want to do it more than once.
Crist provides "kits" for each type of chassis. He does a very good job on these.
Those early circuit boards can have problems like the copper lifting if you use too much soldering heat.
Check the tube sockets closely, they have a history of being damaged by the heat of the tubes. The plastic becomes brittle.

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 Post subject: Re: PHILCO PREDICTA TV Capacitor Styles
PostPosted: Aug Sat 14, 2021 3:56 am 
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Here is his website: https://tvrestorerguy.com/


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 Post subject: Re: PHILCO PREDICTA TV Capacitor Styles
PostPosted: Aug Sun 15, 2021 8:41 pm 
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Great pictures!

The bumblebees will sometimes look similar to resistors. That is where you need a schematic. Unsure if that will affect your Predicta but it affects many sets.


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 Post subject: Re: PHILCO PREDICTA TV Capacitor Styles
PostPosted: Aug Sun 15, 2021 9:00 pm 
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Notimetolooz wrote:
Not specifically in a Predicta but some typical capacitors that have a paper dielectric, and so should be replaced.

Attachment:
VintPaperCapE1.jpg


The Sprague 160P series cap pictured is actually a Bi-Film type using both paper and polyester as the dielectric. I'd however still replace them while you're in there.


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 Post subject: Re: PHILCO PREDICTA TV Capacitor Styles
PostPosted: Aug Mon 16, 2021 7:52 pm 
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Sam's generally had the 1st 2-10 caps in the parts list be all the lytics. The electrolytics would always have the voltage rating...micas and ceramics usually don't have a voltage listed.
Papers are 0.001uF=1000pF or higher sometimes micamold caps (paper caps cosplaying as mica caps) get listed in pF instead of uF.

Ceramics sometimes don't have voltage listed which makes them easier to distinguish.


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 Post subject: Re: PHILCO PREDICTA TV Capacitor Styles
PostPosted: Aug Mon 16, 2021 8:28 pm 
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jimtech wrote:
The Sprague 160P series cap pictured is actually a Bi-Film type using both paper and polyester as the dielectric. I'd however still replace them while you're in there.

Those will not be leaky (that is they will not have DC current pass through them), but they will not be at the correct value.

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 Post subject: Re: PHILCO PREDICTA TV Capacitor Styles
PostPosted: Aug Mon 16, 2021 10:26 pm 
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Tom Schulz wrote:
jimtech wrote:
The Sprague 160P series cap pictured is actually a Bi-Film type using both paper and polyester as the dielectric. I'd however still replace them while you're in there.

Those will not be leaky (that is they will not have DC current pass through them), but they will not be at the correct value.

What Tom says is what most don't realise. I have a box of Cornell-Dubilier PM capacitors. But I won't be putting them in any of my daily use amplifiers.

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 Post subject: Re: PHILCO PREDICTA TV Capacitor Styles
PostPosted: Aug Tue 17, 2021 5:37 am 
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cferry1 wrote:
How do you distinguish from Paper, Mica, Ceramic , Poly capacitor types
The following article is not Predicta-specific, but it has lots of info about identifying and replacing different kinds of vintage capacitors:

https://antiqueradio.org/recap.htm

Regards,

Phil Nelson
Phil's Old Radios
https://antiqueradio.org/index.html


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