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 Capacitor checkers

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Cliff Jones
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Join date : 2010-11-22

PostSubject: Capacitor checkers   2013-10-22, 12:38 am

I have just gotten another cap checker its a
Heathkit c-3 that I am currently working on.


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Filaments light but no green eye. So I have replaced the 2 Power supply electrolytics, 8 Mfds
and am noticing a !0 megohm resistor that reads 440 Kohms. Went to RadioShack, what a joke. They only had 1/8 watt size (surprised they even had that value) so I am going to put 2 in series and then another series pair in parallel, so That should bring it back to the original value. This resistor goes to ground from the eye circuit at pin 5 of a 1629. So hopefully it will bring the voltage up. The 1 Megohm is reading about 990Kohm so that is within tolerance, I will maybe have to replace the other caps (hope not)

The unit is in otherwise pristine shape but very poor soldering so out with my soldering skills to clean up the mess. LOL

I will fire it up after the 10 megohm resistor replacement. I also think I will insert a fuse for safety of the transformer.

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Last edited by Cliff Jones on 2014-01-17, 8:18 pm; edited 3 times in total
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Cliff Jones
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PostSubject: Re: Capacitor checkers   2013-12-29, 10:01 pm

Ordered a few more parts (caps and resistors from JustRadios), I still have to do a wiring exam, just because it was a kit, and they are notorious for wrong wiring.

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Cliff Jones
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PostSubject: Re: Capacitor checkers   2014-01-17, 7:36 pm

Well, I FINALLY finished the Capacitor tester repairs. Now The Eye tube does light up!!!!!!!  cheers 
I  did a lot of resoldering and found a lot of frosty and dull joints. I got myself a headband magnifier and that made a big difference.

I now will recalibrate the unit and see if I can find another Eye tube that is brighter. I will still check voltages and resistor values more closely as needed. I replaced all the paper caps and electrolytics.  Now I will read the instructions LOL. I have been thinking about replacing the eye tube with a meter for interest.

This is my first piece of tube test equipment that is repaired and working. ER AH, my second, the first was a Jackson Tube tester. Embarassed

Err I forgot about adding a fuse, so back on the repair bench it goes.

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FrankB
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PostSubject: Re: Capacitor checkers   2014-03-10, 6:10 pm

OK Cliff,
Now read my article on the forum on how to use this to test Zener diodes. Very Happy 
Glad you got it going.
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Cliff Jones
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PostSubject: Re: Capacitor checkers   2014-03-10, 7:36 pm

Got that and printed it in notepad for future reference, thanks.

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PostSubject: Re: Capacitor checkers   2014-03-21, 3:47 pm

Well It worked well and now has been Sold, one of the first things to sell Up at PSARA meet last week. cheers 

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PostSubject: Re: Capacitor checkers   2014-03-21, 7:40 pm

Capacitor Checkers,
Hmmmmmmm. Great idea for a game using old radio parts.
If one used the old sticky waxies, then you could king them real ez and they would stick together.
Maybe Zenith and Philco caps for red & black? Shocked Cool Twisted Evil
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PostSubject: Re: Capacitor checkers   2017-05-23, 5:31 pm

As I went through my receivers in my Magnavox console, I found there had been some in production changes in the capacitor lineup.  the bad part about it was that the colors making up the dot codes on the molded paper caps had darkened or changed color.  I bought one of these on Ebay for just under $14 and it did nicely in giving me the values.  My interest was more as an inexpensive tool as opposed to an old piece of restored gear.

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