Mighty Monarch of The Air

[ggregg]

that's on the bottom of electroylic multistage cans. With most new caps (except electrolytics), polarity is not an issue, like resistors. The old ones had the terminal with the outside foil on it marked, not usually the ground. Be careful though, small electrolytics will have the negative marked and that must be followed. They usually have a paper or cardboard covering and are pretty easy to read. Electroytics are usually 1-2 mfd (microfarad) or higher. You usually won't see one lower than a 10 or 8 mfd. That .1 mfd you have in your hand is not an electrolytic. Some capacitors are rated in mmfd (micro micro farad), or pf (picofarad, same thing), which is even lower. Mmfd or pf caps are usually mica or ceramic.

Is this your first attempt at electronic repair? If so, I would suggest letting the TV sit for a while and buy a cheap AA5 tube radio. This will help you to identify parts and repair something that is a lot more simple than a TV. Also if you totally screw it up, like I did the first couple of times, you haven't wrecked anything important. I hope I'm not out of line. Just a friendly suggestion.

[vts1134]

I think I'll forge ahead and break something important the first time. You have however made my evening a lot shorter. There are very few larger mfd capacitors in the set, and they are all very easy to read polarity.


What kind of capacitor did I have in my first picture?

[wa2ise]

Originally Posted by vts1134

What kind of capacitor did I have in my first picture?

Wax paper. Guaranteed to be bad. Nonpolarized. Replace with "Orange Drops" or similar mylar and foil cap. Use the same capacitance (or within 10%) and same or higher voltage rating. More at http://www.wa2ise.com/radios/repair.htm

[ggregg]

Originally Posted by ggregg

Electroytics are usually 1-2 mfd (microfarad) or higher. You usually won't see one lower than a 10 or 8 mfd. That .1 mfd you have in your hand is not an electrolytic.

I meant to say you usually won't see one lower than a 10 or 4 mfd.

Good luck, ask for help if you need it.

[Phil Nelson]

Here are more articles that may be helpful. The first one covers recapping:

http://antiqueradio.org/recap.htm

http://antiqueradio.org/restoration.htm

Regards,

Phil Nelson
http://antiqueradio.org/index.html

[vts1134]

Thanks for the articles. I read both of them before actually. I did run into one more thing. I actually ran into it when ordered my caps. There is one cap that on the photofact says 600v but the one that is installed is 800v. I ordered a 630v trusting that the photofact is correct but now I'm second guessing myself into thinking I need something over 800v.

[Phil Nelson]

Which cap is it (Sams part number)?

Phil Nelson

[vts1134]

I'm not sure to which part number you are referring. The parts list has an item number, which is C40. There is also replacement part numbers from-
Majestic- D03.100-12
Aerovox- P688-022
Centralab- DF-203
Cornell Dubilier- PTE6S2
Sprague- 6TM-622
The schematics state that it's used for audio coupling. Sams states .022mf capacitance and 600v voltage rating. The cap in the set is .02mf 800v.

[Phil Nelson]

I mean the part number given in the Sams manual (C40). 630V should be fine there.

Phil Nelson