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Powerstat 10B-1036

tubekarma

tubekarma

New Member
I have a couple of Powerstats, type 10b-1036, that I want to use in a bench-top power panel, but they have seven lugs and I can't find any specs. I rang them out and I gather that 1 and 2 are the ends of the primary with 1 also being one end the secondary and 3 the wiper. Using 4 or 5 instead of 2 as the primary hookup boosts the output voltage to 135 and 150 respectively. I've attached a couple of pics. Anyone know what's up with these? What 6 and 7 are used for? Where I can find a schematic, wiring diagram, spec sheet...?

Best,

John
 

Attachments

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BillWojo said:
Try this link.
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=2ahUKEwjltKeL7s_cAhWQylkKHcE4C7oQFjABegQICRAC&url=http://lcweb2.loc.gov/master/mbrs/recording_preservation/manuals/Powerstat%20Catalog%20P258G.pdf&usg=AOvVaw1OMzW4g9tUMg-9KmAjkFYF

This is the catalog of the product range and shows hook up connections.
BillWojo
Click to expand...

Though they didn't have my model in the catalog, I was able to figure out my details from similar ones.

Thanks,

John
 
I figured if you got as far as you did that you would be able to get it hooked up. I was amazed at all the different models that they offered.

BillWojo
 
Yeah, once upon a time it was a HUGE business and they built quality; 50, 60 years later their stuff works perfectly. Just installed my Powerstat, hooking it up with a meter now.
 
Well, a variac like this is just wire coiled around a ferrite donut. The wiper is just a carbon brush that selects the number of windings. It's an autotransformer, which means the primary and secondary are all one winding. One end is wired to neutral, and the output neutral. The wiper is obviously the output. And depending where you connect the hot, it can boost the voltage. Not knowing the specs, I'd play it safe, and just connect the other end so it doesn't boost voltage. That will give you better resolution, and it will run cooler.

I scored a monster powerstat a long time ago. It's 0-240v @10a, but it had a center tap. So I wired it for 120v in, 0-240v out. Anything above 120v, and the current should be less than the 10a rating, so @ 240v, it would only be 5a. It's limited to 10a of input current that way, 180v would be 7.5a, and the current would be a linear taper down as the voltage increases on the output.
 
dB happy said:
I scored a monster powerstat a long time ago. It's 0-240v @10a, but it had a center tap. So I wired it for 120v in, 0-240v out. Anything above 120v, and the current should be less than the 10a rating, so @ 240v, it would only be 5a. It's limited to 10a of input current that way, 180v would be 7.5a, and the current would be a linear taper down as the voltage increases on the output.
Click to expand...
 
I found something on that series of powerstat that said 10% voltage boost. 10% of 120 is 12v, which would give you 132v. I had a little one like that that took in 120, and put out 132. 135 is close enough. If you do want it to boost voltage, that config is what I'd use. I wouldn't wire it for 150v. Don't know why yours has the extra taps, but I wouldn't use them.
 
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