[Boatanchors] Superior Electric - Variac for sale

[J. Forster]

There may be a difference.

General Radio (aka GR and GenRad) used high resistivity brushes, made of
carbon, like motor brushes. (I say high resistivity...  I mean high wrt
copper). The reason for this is the brush shorts several turns of the
winding. The high turn-to-turn resistance reduces the circulating curreent
in the windings. I believe GR had a patent on this.

At least some other brands of variable autotransformers do not do this.

I don't know offhand whether Superios does or does not use a high
resistivity brush.

FWIW,

-John

==================





> Powerstat is simply the "name" that Superior put on their variacs.
>
> There is no real difference.
>
> The company chose that name to stick on their dataplates.
>
> Bob - N0DGN
>
> On 4/20/2014 10:14 AM, Tom Nicholson wrote:
>> OK, someone has to be the "Punching Bag"! I've reached the age that my
>> desire to learn overrides my desire to not appear uneducated!
>>
>> What is the difference between variac & powerstat?
>>
>> Tom W1ALZ
>>
>>
>>
>> On 4/20/2014 9:40 AM, rbethman wrote:
>>> I have one of their Monster ones.  It will run 40A.
>>>
>>> It is indeed a boatanchor all by itself!
>>>
>>> Bob - N0DGN
>>> On 4/20/2014 9:30 AM, Drew P. via Boatanchors wrote:
>>>> Gary Hitchner wrote:
>>>>      "Superior Electric Variac, 115V, 7.5 A.  Very good to
>>>>   excellent condition. With original handle, and scale."
>>>>
>>>> Superior Electric?  It ain't a "Variac", it's a "Powerstat"!
>>>>
>>>> More seriously, I wish you well in selling your Powerstat, and the
>>>> buyer good luck in using it.
>>>>
>>>> Drew
>>>
>>
>>
>
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