Adcom GFA535..Bad Transformer? - Page 2 - diyAudio
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Old 7th May 2005, 02:14 AM   #11
K-amps is offline K-amps  United States
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The little 535 is the only true dual mono power amp adcom made ;-)

It had 2 E+I trafos, rest had single toroids.
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Old 7th May 2005, 07:07 AM   #12
anatech is offline anatech  Canada
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EchoWars,
I think the truth about the failure will come out once you see this fella. The fuses aren't too bad to change on most EI cores - if you need them.

-Chris
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Old 7th May 2005, 09:34 AM   #13
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No, it has two little square jobs.

The GFA545 had a single torroid running about 55V, and one more pair of outputs.

If you look you will see the PC board and the sink on the GFA535 are laid out for the extra parts.

I think you would have a hard time retro-fitting a torroid into the GFA535 chassis though.

ECG used to sell one-shot thermal fuses in a whole range of temperatures. If I replaced them I always went the next LOWER temperature as the transformer insulation was stressed from the first time they went.

If the customer blew them more than once I told him to buy something else.
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Old 7th May 2005, 12:20 PM   #14
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NTE still sells the thermal fuses in a nice range of temps. I'd just have to decide what might be appropriate...if that is the problem.
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Old 7th May 2005, 08:54 PM   #15
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Just look up the value in your area. In Canada we had a 10C lower limit than the States. We changed transformers by the box. I remember that Yamaha was hit hard by this (nothing wrong with the xformer, just the fuse). I would tend to install the same temperature as the original.

-Chris
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Old 9th May 2005, 12:37 PM   #16
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I have no idea what a temp of a thermal fuse internal to a transformer ought to be. What did you use? That would at least give me a ballpark figure to work from...
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Old 10th May 2005, 02:20 AM   #17
anatech is offline anatech  Canada
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Hi EchoWars,
Now that was a long time ago. Look up the requirements in UL. You can't go wrong there. Canadian standards would have no bearing there, although they are supposed to be unified by now.
-Chris
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Old 10th May 2005, 03:56 AM   #18
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I'll preface this with: 'Ive never had to repair an Adcom xformer'.
In the xformers I could/did repair the fuse had markings and I would just replace with the appropriate part. So if you can get to it it should be no problem, some fuses were buried and unrepairable.

Bill
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Old 10th May 2005, 04:51 AM   #19
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Quote:
Look up the requirements in UL
Appears that UL will show me its requirements for the small fee of about $215 so I can download a pdf.

I don't think so...

I'll see if the fuse is the problem first, then decide what to replace it with.
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Old 10th May 2005, 11:19 AM   #20
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On the 555ii's if I remember, the thermal breaker could be bypasses as it has a separate cable. i.e. you could connect the primaries with or without having to go via he fuse/ breaker. I think it was the brown wire...

If the have schematics of the 535, perhaps you can rig it from the outside...
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