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What is this odd little box I've been storing for years?

I received this switch/pot a few years ago with a used preamp and have never been able to identify it. When I asked the seller he said he didn't know either, he just thought it was part of the preamp (it's not). I wish I could post a picture here - but it's about a 3.5"black cube, with an older brown AC cord, an on/off rocker switch, fuse holder and small attenuator pot on the front. I though it might be a wireless remote switch for a turntable, but can't find any similar images online. Any ventured guesses would greatly helpful
Glenn 
gwbeers
almarg's avatar
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almarg
9,670 posts
 
The shaft of the pot only turns 180 degrees. Inside there’s a transformer (EWC31004GO5), the base of the cylindrical fuse holder, the rear of the pot is a rheostat with a black resistor inline to the transformer....

The only thing I can think of at this point is that it might be a piece of test equipment, perhaps for the purpose of applying a variable load to the output of AC power supplies of some sort. The fact that the device does not provide an output would seem to rule out any other possibility I can think of.

Regards,
-- Al
celander's avatar
celander
1,503 posts
 
The odd thing is that once you toss it out, you will figure out that you need it for something. Lol
jnovak's avatar
jnovak
419 posts
 
My first thought was "maybe it's part of something like the B&W bass
alignment filter". Look at one. Joe
viejomalo's avatar
viejomalo
1 posts
 
Sounds like it might be an old lamp dimmer.
alteredstates
7 posts
 
Post a pic and question to Vintage audio on facebook.  Someone will know what it is.  There are some very knowledgeable people on the site.
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