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ADCOM Audio amp

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  • Jazz P Bass
    replied
    From the schematic it appears that they are using both sides of the DPDT (in parallel).

    Leave a comment:


  • Enzo
    replied
    A DPDT can be used in place of a DPST, just leave the extra pegs unconnected.

    Leave a comment:


  • Jazz P Bass
    replied
    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

    Leave a comment:


  • The Dude
    replied
    Actually, it's a DPST.

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

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  • Enzo
    replied
    There you go.

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  • The Dude
    replied
    How 'bout this?

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

    or, here it is at Mouser:

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

    Leave a comment:


  • Enzo
    replied
    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.

    Leave a comment:


  • Perkinsman
    replied
    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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  • Jazz P Bass
    replied
    Not too sure that I would trust the fact that the power switch is faulty.
    That makes the amp essentially 'untested'.

    Leave a comment:


  • The Dude
    replied
    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.

    Leave a comment:


  • Perkinsman
    replied
    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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  • Enzo
    replied
    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

    Leave a comment:


  • Perkinsman
    started a topic ADCOM Audio amp

    ADCOM Audio amp

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