Help identify this transformer

[Slippyblade]

I am currently piecing together the power center in a cab following the instructions here: http://www.therealbobroberts.net/acwiring.html.  I am working with the guts of a cabinet I recently acquired, thread here http://forum.arcadecontrols.com/index.php?topic=102828.msg1090477#msg1090477.  However, what I thought was an isolation transformer appears to not be. 


The one side has a green wire that is obviously an earth ground as there is a zero resistance between it and the transformer casing.  There are also three wires coming from that same side ending in a 3 prong molex connector.  The wires are White and Black on the sides and middle one is Black w/White stripe.  Other side has 2 White wires ending in a 2 prong connector.  If I wire up the first side to ground and then the white and black to my filter I am getting 120v on that side of the coil but only 12ish on the other side.

The only identifying mark that I can find is a sticker with the numbers 437P41 and 549-9504 on it.  I'm getting the feeling I'm not wiring it correctly or something.

Any help would be great as this is annoying as hell...
Slippyblade

[BobA]

From your description it sounds like a 120 to 12V center tapped or 24v center tapped depending on where you measured the voltage on the secondary side.  Transformer is used for power supplies not isolation.

[Slippyblade]

Kind of what I thought, but I'm wondering what the heck it was doing in the cab to begin with...  And now I have to try to find an isolation transformer for the stinking monitor.    

CRRRAAAAPPPPP!!!!  I just figured out what the heck this thing was...  The guy I bought the cab from said he used to have a 4-way audio amp inside it driving the speakers.  Said it was his uber-juke back then.  When I looked up center-tap transformers just now, the article mentioned that one of the common uses was in audio amp power centers.  Hmmm, I think the mystery is solved and I've got a transformer that does me NO good.  Dang it.

[BobA]

If there was a monitor in it when it was a juke cab how was it powered?   Are you sure it needs an isolation transformer?

[Slippyblade]

Yeah - schematic says so.  The cab was pretty beat up and stuffed with random parts when I got it, so lord only knows what happened to the original.  I just looked at pricing thought and an isolation transformer only runs about $10 so no huge issue.

[BobA]

OK that explains it a cab = bucket of parts.  Should be fun.