Marshall JMP1 with flaky power button

[PRNDL]

I've got a Marshall JMP1 preamp with a flaky preamp button.

Usually it doesn't power on, but it will if you turn it on and off a few times, and then it seems to work fine for a little while.

It's a green switch - ITT Type NE1B Power Switch 9104

Is this a common issue with these switches?

Does anyone know where to buy a replacement?

Thanks!!

[Twist]

You might post a picture of the switch. I'm sure alot of guys on here have tons of old boards and chassis's. Otherwise you'll have to go through Korg. I have a huge pile of old amp parts and boards in my shop.

[Enzo]

Or browse Mouser etc.

Isolate the problem. If you think the switch itself is at fault, bypass it with clip leads or tack solder a shunt across it to find out.

SOme switches are DPDT and they only use half of it. Jumpers can be wired to the still good other half. I don't recall in this case, but is a possibility.

[oc disorder]

Spooky I've got one here so I took a happy snap of the switch.
Easy to jumper the switch with two scraps of wire.
Does any one know when the midi channels are displayed what o is?
goes o 1 to 16 so I guess off or maybe all channels ?
Spose should seek out the user manual or dust off the Atari under the house
and try to remember how to send patch change info...
The switch looks like one similar to on/off switches in tv/monitors although
they have different mounting arrangements
Just had another thought..the power transformer looks like its just anchored to the pc board by the terminals.
If its been on the road maybe there could be a few suspect solder
joints...but do what Enzo suggested first bridge the switch and see if that solves the problem.If not try tapping /wriggling the transformer in case the mechanical vibration of the switch is
aggravating other connections.