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Adcom GFA 555 Overheating with remote volume control?
Adcom GFA 555 Overheating with remote volume control?
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Old 7th July 2016, 02:19 PM   #1
Snobeeler is offline Snobeeler  United States
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Default Adcom GFA 555 Overheating with remote volume control?

Hi all, I am having a issue with my Adcom GFA 555 overheating and shutting down when I use a Niles Audio VCS 100k speaker volume control for my outside speakers (Paradigm 9SE). This happens at any sound levels. When I eliminate the Niles Volume switch the amp runs cool. I have used a different (not sure what make) volume control in the past with no issues. It is still at my previous house unfortunately. I have verified all wiring is correct and undamaged. Can anyone advise on what might be wrong? Thanks
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Old 7th July 2016, 02:47 PM   #2
anatech is offline anatech  Canada
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Adcom GFA 555 Overheating with remote volume control?
Hi Snobeeler,
That control doesn't look like it will handle very much power. If the transformer cores saturate, they could present a very low impedance to the amplifier. The output volume isn't the problem, it's how much power the amplifier is delivering that can overtax the transformers. Does that control have a rating for the maximum power it can handle?

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Old 7th July 2016, 08:38 PM   #3
Snobeeler is offline Snobeeler  United States
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The specs said it could handle 100 watts. I know my 555 is much higher than that. The most I turn up the volume is moderate for short times. Could I have damaged the volume controller in some way that it is now causing my problem. as I think back the 2 months I have been using it, it appeared to work fine, its only recently the issue showed its face. Thanks for the help.
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