Gain boost switch on MK IIB

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Jul 31, 2017
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Hey guys,

Bought a MK IIB last week - used it at a show Sat night!

I have a question. Next to the preamp output, it looks like a jack for a gain boost switch. The wire runs from the jack to the mid pot, which on the schematic is where this switch is called out.

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Anyone seen one of these before? It looks like an RCA plug or something. I haven't found any good references. The amp is from Aug 1981 as you can see from the pics. 60W combo, no reverb or EQ. It's very clean, so I don't think it's been messed with.

I think if I pull the Master 1 pot a footswitch could be used to ground it out so that it becomes switchable.

The thing gets loud with the Gain Boost pulled out from what I remember, so it would be nice to be able to switch it on with a pedal.

EDIT: I hate photobucket.
 

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