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  #1  
Old 06-14-2012, 10:38 PM
6GH8cowboy 6GH8cowboy is offline
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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?
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Old 06-14-2012, 10:52 PM
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Eric H Eric H is offline
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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?
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Old 06-14-2012, 11:09 PM
bob91343 bob91343 is offline
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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.
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Old 06-17-2012, 08:06 AM
6GH8cowboy 6GH8cowboy is offline
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Thanks. I think I'll leave it alone for now. It's working for now but this thing is looking sketchy.
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Old 06-24-2012, 03:54 PM
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Biker2 Biker2 is offline
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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
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  #6  
Old 06-24-2012, 04:53 PM
bob91343 bob91343 is offline
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This one isn't selenium; it's copper oxide.
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