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-   -   Mystery part in tube tester (http://www.videokarma.org/showthread.php?t=254648)

6GH8cowboy 06-14-2012 10:38 PM

Mystery part in tube tester
 
I have a Heathkit IT-21 tube tester. I decided to replace the paper cap and noticed a "stack in a clamp" of small disks. Is this a rectifier, a voltage reference, a 2000 amp fuse in a 20 mil ckt, or what?
There's no space between the disks and I didn't want to disturb it. This is a very basic tester I know but it done me well for what I do.
What is this mystery part?

Eric H 06-14-2012 10:52 PM

It sounds like a Selenium Rectifier.
Can you post a picture?

If you heat it with a soldering iron does it smell like rotten eggs?

bob91343 06-14-2012 11:09 PM

I looked at the schematic and the thing is very simple, has very few components. The only thing that could be is the meter rectifier. It should have a red and yellow lead coming from it.

It's a copper oxide rectifier, judging from the look of it.

6GH8cowboy 06-17-2012 08:06 AM

Thanks. I think I'll leave it alone for now. It's working for now but this thing is looking sketchy.

Biker2 06-24-2012 03:54 PM

this is a good read about the selenium rectifiers. Also remember taking them apart to clean and putting them back together; in the right order.
http://w3hwj.com/index_files/RBSelenium2.pdf

bob91343 06-24-2012 04:53 PM

This one isn't selenium; it's copper oxide.


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