quote TerryBNZoh sorry and used a standard 3.5mm jack with outer collar to first pin (closest to the rear) and the other two to left and right where the 22k resistors are fitted.Just found this thread.
I have moved house and found my old Boston BA735 speakers in the junk.
I had no surface mount components so I just used 22k 1/4watt for R10 and R16. I used 4.7uf 35v electrolyte cans for C25 and C38, just guessed at the polarity and put - to the right when looking from the rear (jack side).
and it seems to be working fine.
Thanks for your help
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