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8th February 2008, 06:26 PM
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#1 |
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diyAudio Member
Join Date: Dec 2006
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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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8th February 2008, 08:08 PM
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#2 |
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diyAudio Member
Join Date: Dec 2006
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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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9th February 2008, 01:34 PM
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#4 |
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diyAudio Member
Join Date: Apr 2006
Location: East TN
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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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9th February 2008, 04:27 PM
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#5 |
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diyAudio Member
Join Date: Jun 2007
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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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20th May 2008, 02:42 AM
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#7 |
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diyAudio Member
Join Date: Oct 2004
Location: Falls Church, VA
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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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