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.
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.
