Damdam

Does anybody have a picture of the back of a JMP model-1987 50W with the Impedance selector plug removed ??? The print is worn off mine and I want a visual of what position it should be for 8 ohms selection.

Thanks

Marshall Amps

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rob

I have that amp but no digital camara but i can tell you that there is 3 settings 4ohms is at 10 o clock
8ohms is at 2 oclock and 16 ohms is 6 oclock hope that helps.

Guitarmd

Be careful with that, although on tube amps it is not as vital.
My 1972 JMP 50 is a European model and has both voltage
and imp. selectors,however the pins do not line up with the
window the way you would think.
The imp. plugs are available, but take it to a Tech to measure
output resistance at each pair of pins.
He should be able to do it in 5 minutes.

Guitarmd

Be careful with that, although on tube amps it is not as vital.
My 1972 JMP 50 is a European model and has both voltage
and imp. selectors,however the pins do not line up with the
window the way you would think.
The imp. plugs are available, but take it to a Tech to measure
output resistance at each pair of pins.
He should be able to do it in 5 minutes.

Damdam

can anybody measure the output resistance at each pair of pins and post back here?