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Old 8th February 2008, 06:26 PM   #1
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Default GFA-555 transformer help

I have a GFA-555 transformer, and all the secondaries are figured out, but I can't figure out the primary side of it.
Blk/Blu are in series.
Yel/Wht are in series.
It has a Brown, red, Org left. Where do I hook up 120, and nuetral?
1.3 Ohms between
Org/red, and Org/brown
.5ohms between Brn/red
Can I use 2 seperate 120(240) for more VA?
thanks
Ben
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Old 8th February 2008, 08:08 PM   #2
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OK I did a little playing around. I put some power to it. BIG BUZZ. This thing came out of a blown amp. The bridge rectifier was shot!.
OK so I have it hooked up to hot on the brown, and nuetral on the orange. I get 70vac on all outs. The only concern I have is 64vdc per out rectified. The red on what I thought was the primary is 24vac for the low voltage systems. I think this all checks out.
Thanks
Ben
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Old 9th February 2008, 01:26 PM   #3
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How about contacting Adcom requesting info? I have to imagine they'd help out. Just a thought.
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Old 9th February 2008, 01:34 PM   #4
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Searching this board, it appears that user "Mayank" has the service manual for this amp. You might send him an email.

Alternatively, this web company sells various service manuals.
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Old 9th February 2008, 04:27 PM   #5
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When I contacted Adcom, they e-mailed me PDFs for the 545 & 555 (series 2) at no charge.

I thought that was good service and public relations on their part.
-Tom
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Old 9th February 2008, 06:26 PM   #6
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Thanks guys
I will contact them.
Ben
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Old 20th May 2008, 02:42 AM   #7
Mayank is offline Mayank  United States
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Ben:

I came across this older thread ... did you figure out the wiring for the GFA-555 transformer?

If not, I should be able to dig up my notes and post the color codes. The GFA-555 had options to wire the transformer for different voltages 100V/120V/220V/240V.

Rgds
Mayank
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