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  • ADCOM Audio amp

    I’m considering purchasing a gfa-555ii with a bad On switch. Does anyone know what specific type switch is used?

  • #2
    Who cares? Wire across the switch so it is always on, now plug it into a switched outlet strip. Voila.

    You show us a photo of the bad switch, I bet we can identify it.

    From this picture of one, it appears to be a small wide rocker.

    https://www.kenrockwell.com/audio/adcom/gfa-555-ii.htm
    Education is what you're left with after you have forgotten what you have learned.

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    • #3
      I could do that but I'd rather replace it with the correct switch, which is why I asked if anyone knew the specific switch. It was clear that I don't own it yet so I can't post a pic.

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      • #4
        From this pic, it looks to be a DPST and small wide rocker like Enzo says.

        https://img.usaudiomart.com/uploads/...power-amps.jpg
        Last edited by The Dude; 02-01-2021, 11:33 PM.
        "Yeah, well, you know, that's just, like, your opinion, man."

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        • #5
          Not too sure that I would trust the fact that the power switch is faulty.
          That makes the amp essentially 'untested'.

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          • #6
            The unit is advertised as working but the On switch isn’t. He turns it on/off thru a strip but I’d like to have a replacement I can install when it arrives.

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            • #7
              OK, so it is stuck ON. It could be a broken switch, but I know plenty of amps that use a power triac as the main switch, with the panel rocker just turning the triac on and off. A shorted triac leaves the unit always on, even if the switch is good.

              I know you don't have it, but I am sure we can replace the switch or otherwise deal with it. I kinda had the idea of taking a photo and a measurement after you get it.

              In my shop I had a huge switch collection, and usually I didn't know offhand what amp used what switch, but I knew I could match it from stock.

              It is highly unlikely that ADCOM used some custom made switch, more likely they just used some stock Carling switch from the catalog.

              I see from the internals photo it does not use a triac, the mains wire wired right to the switch, It could even be a full size rocker, like on a Peavey CS800 or a Marshall head.
              Education is what you're left with after you have forgotten what you have learned.

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              • #8
                How 'bout this?

                https://www.adcomparts.com/Power%20S...-37001030.html

                or, here it is at Mouser:

                https://www.mouser.com/ProductDetail...%252BV7FkeE%3D

                "Yeah, well, you know, that's just, like, your opinion, man."

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                • #9
                  There you go.
                  Education is what you're left with after you have forgotten what you have learned.

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                  • #10
                    You guys are good here...does it have to be a dpdt or can i use a spst?

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                    • #11
                      Actually, it's a DPST.
                      "Yeah, well, you know, that's just, like, your opinion, man."

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                      • #12
                        The parts list calls for a RGSCC-711_R-B-B-O switch.
                        I don't see the 711 anywhere, just the 901.
                        This may be the one: https://ca-en.alliedelec.com/product...-b-e/70578822/
                        Attached Files

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                        • #13
                          A DPDT can be used in place of a DPST, just leave the extra pegs unconnected.
                          Education is what you're left with after you have forgotten what you have learned.

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                          • #14
                            From the schematic it appears that they are using both sides of the DPDT (in parallel).

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