07-11-2015, 09:03 PM
Just a quick update , ive now had all the pots arrive from Russia , but they may not do the job , basically there is a separate transformer that
supplies 25v to these potentiometers and then feeds the other side of the main vu metre , once the current is equal the gauge reads zero , so
you would not want any voltage leaving the pot when in the off position , otherwise it would mess with the ma reading , also the pot needs to
supply the voltage slowly and allow all 25v if its needed , I did notice a foot to lift the sweeper clear of the track when off on the old pot , so this would also have to be checked , there is one original pot that is working fine , also one avo mk2 that seems to be better than the others , on
one of the testers the neg grid pot is out of tolerance , you can adjust it for half way but its out at 1v and 10v , main meters in both mk2 testers
seem to read low , £100 to get them recalibrated and cleaned also re magnetized , worth doing if everything else is ok , I keep reading and trying to understand the workings of these things , cheers me phil.
supplies 25v to these potentiometers and then feeds the other side of the main vu metre , once the current is equal the gauge reads zero , so
you would not want any voltage leaving the pot when in the off position , otherwise it would mess with the ma reading , also the pot needs to
supply the voltage slowly and allow all 25v if its needed , I did notice a foot to lift the sweeper clear of the track when off on the old pot , so this would also have to be checked , there is one original pot that is working fine , also one avo mk2 that seems to be better than the others , on
one of the testers the neg grid pot is out of tolerance , you can adjust it for half way but its out at 1v and 10v , main meters in both mk2 testers
seem to read low , £100 to get them recalibrated and cleaned also re magnetized , worth doing if everything else is ok , I keep reading and trying to understand the workings of these things , cheers me phil.
