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Hoffman Amplifiers > Amp Stuff > AmpTools/Tech Tips (Moderators: Geezer, tubenit, PRR, sluckey) > Variac for both AC & DC use?
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GuitarPilot65
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Music by Lee/ Lifeson; Lyrics by Peart
« on: February 15, 2012, 02:21:07 pm »
Is there such an animal out there?
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Willabe
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« Reply #1 on: February 15, 2012, 02:28:19 pm »
Why do you need that?

If you have a DC sup. just use the variac to feed the primary of the PT or use a variable DC sup.


                Brad   
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FYL
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« Reply #2 on: February 15, 2012, 02:54:40 pm »
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Is there such an animal out there?


A Variac is an auto-transformer and only works with AC (well, it also attenuates DC because of it's winding resistance but not significantly).


(From Wikipedia)

The DC version is a rheostat, a really big wire-wound potentiometer.
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John
So what's that do?
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« Reply #3 on: February 15, 2012, 05:06:29 pm »
When I was looking for a variable AC supply, I ran across lots of the DC as well, and they were pretty cheap. But don't recall seeing one that did both.
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jjasilli
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Took the power supply test. . . got a B+
« Reply #4 on: February 15, 2012, 06:48:14 pm »
Yes, you can have a variable DC power supply, but it's not a variac.  A variac is called a variac because it is used to VARy AC.
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