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Old 11th January 2012, 12:29 AM   #1
Studio1 is offline Studio1  New Zealand
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Join Date: Jul 2008
Default Help needed to ID this amp module

Hi folks,

I have two of these modules which look to be of EA or ETI heritage, but I've not seen them with speaker protection relays and associated circuitry onboard.

The copper-side has some markings:

'VAMP' with '186' below it and further down the board is 'JSJ'.

I can sit and draw the circuit out but if I can determine where it originated that would be a great help.

Interestingly enough, the mosfets aren't the same - it has a 2SJ49 and a 2SJ56 on one side, but a pair of 2SK176 on the other. Possible that one was replaced at some point or the constructor only had that odd pair.

Any thoughts most appreciated.
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