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Old 3rd January 2007, 06:45 PM   #1
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Default Looks like a transformer, but..

Hey all,

I might be an idiot. Here's the situation:

Taking stock of my transformers. Have an unusual one. One side black-white-black leads are connected. Very low resistance between the black leads (.3 ohm). Black leads are huge solid wire, looks like 14 AWG. White wire is just as thick but stranded. White-black resistance is 0.2 ohm

Other side three leads: green, green/beige, beige. Green/beige is CT because resitance is less between it and each of the others. (Curiously the beige wire has much less insulation and is thinner.)

Ignoring the fact I've not encountered more than two leads on a primary, I connected the AC to the black leads. Bringing up the voltage on the variac slowly causes the current draw to skyrocket past about 50V input.

Before I heave it into the bin, any idea what I've got here? Thanks..
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Old 3rd January 2007, 09:18 PM   #2
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The thick leads is never the primary. It's always the thin leads.
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Old 3rd January 2007, 11:23 PM   #3
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Quote:
Originally posted by Bernhard
The thick leads is never the primary. It's always the thin leads.
What about step up transformers?
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Old 3rd January 2007, 11:45 PM   #4
AndrewT is offline AndrewT  Scotland
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Hi,
could this be some kind of audio transformer rather than mains power?
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Old 4th January 2007, 03:02 AM   #5
ReidK is offline ReidK  United States
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Quote:
Originally posted by ak_47_boy

What about step up transformers?
Yeah, it sounds like somebody has never worked on a tube amp.

Reid
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Old 4th January 2007, 03:05 AM   #6
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How about pictures?

Common-mode inductor?
Switching transformer?
Auto-former?
Buck-boost transformer?

Need more information to be of much help.
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Old 4th January 2007, 02:54 PM   #7
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Not an output transformer. Here's a pic:

Click the image to open in full size.
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Old 4th January 2007, 03:08 PM   #8
SY is offline SY  United States
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Quote:
Green/beige is CT because resitance is less between it and each of the others.
Maybe. Maybe not. What's the exact resistance between green-beige and green? Between green-beige and beige? And green and beige?
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Old 4th January 2007, 03:10 PM   #9
Elvee is online now Elvee  Belgium
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Hi

Have you tried to connect your variac on the beige (primary?) side.
LV
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Old 4th January 2007, 03:44 PM   #10
edl is offline edl  Hungary
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Hi,

Maybe a transformer of a PC-UPS?
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