ADCOM Audio amp

[Perkinsman]

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

[Enzo]

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

[Perkinsman]

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.

[The Dude]

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

https://img.usaudiomart.com/uploads/...power-amps.jpg

[Jazz P Bass]

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

[Perkinsman]

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.

[Enzo]

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.

[The Dude]

How 'bout this?

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

or, here it is at Mouser:

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

[Enzo]

There you go.

[Perkinsman]

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

[The Dude]

Actually, it's a DPST.

[Jazz P Bass]

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/

[Enzo]

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

[Jazz P Bass]

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