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Thanks for the info,Ive looked at the link,and will study it in detail.I've tested the pot,& allthough it's marked 50K, I get 44k between the fixed pins,Assuming the pins are #1,2.3&4, 1&3being the fixed pins,2 wiper,& 4 the out side pin.then the readings are-1&3=44k. 1&40k, 3&4=4k,(these are the fixed settings)between the wiper and fixed pins resistance varies as normal.Between the wiper and pin4, turned fully anti clockwise,it starts at 4k,then turning clocwise,it reduces to 0 at half way,& then increases to 40k
for the rest of the turn.(Now I'm really confused)Anyway I'll study the link and see if I can use it.Iwant to install tone controls to my amp,and have got the suitable pots,so if I can find a diagram ,I might go this way.Your advice has allways been good,so I will follow it up.The resolution of the PDF is not too good,but if you zoom OUT it looks better,
regards-Terry.