anyone steer me in the best way to check electrolytic capacitors in circuit?esr meter,oscilloscope,capacitance meter,voltage readings,ect.what type of pattern would you look for with an oscilloscope?bypass caps,filter caps,coupling caps.any help appreciated.what is a better capacitor meter the sprague to6a or the sencore c55..what do you reccomend for a meter or testing?or should i say what do you do and use??...thanks....ed!!

here is a tough one . i know this is an amp forum,but i am having a problem with static crackling noise in a gr20 roland guitar synth.you can't get a shematic from roland for it.i'm not sure where to send a signal into the midi connnection so i can signal trace with an oscilloscope.anybody had a simular problem or have any ideas.the unit works great in all other areas. it just has alot of noise.the guitar and pickup works perfectly with another unit.the midi chord is good and there is a new input board in it and it didn't make any difference. don't see any cold solder joints.....any help appreciated.i thought this would be my best place to get a fix for this unit.as i have delt with this site in the past and rate this site as the #1 elcectronics knowledge base on the net!!!....keep rocking....thanks...ed!!

any ideas! i have a fender fm65-r amp that plays for about an hour then it turns off for about 10-15 seconds.then it starts up playing normally for a bit then cycle off and back on again.like a computor loop.when it starts up after quitting it starts low in volume and gets louder as it comes back to normal playing volume.just like an amp that is initially turned on.i replace 2 transistors as they were getting hot to the touch. i thought they might be leaking,but guess that wasn't it.do you think it might be an output chip?anyone had this problem with this model?how do i test for a bad chip.i have a signal tracer ,scope ect.i replaced a 1013 and c 2383 which are larger in size than the other chips on the board.thanks...ed!!!

DOES ANYONE KNOW WHAT IC CHIPS WILL REPLACE A 739 14 PIN IC AND A 5558 8 PIN IC? I HAVE A NEC 7411 CHIP IN PLACE OF THE 739 CHIP AND I GET SIGNAL IN BUT NOTHING COMING OUT..THANKS...ED!!

I HAVE A CRATE GFX50 THAT THE EFFECTS DON'T WORK.AFTER LOOKING AT THE SCHEMATIC THERE IS A RESET ON THE CHIP.DOES ANYONE KNOW THE PROCEEDURE FOR DOING THIS RESET?...THANKS...ED!!

HI I WAS WONDERING IF ANYONE OUT THERE KNOWS WHAT IC'S ARE SUPPOSED TO BE IN A MODEL 1-L KUSTOM SOLID STATE AMP.IT IS NOT ONE OF THEIR TUCK AND ROLLED AMPS. IT IS COVERED IN BLACK VINYL  AND HAS A SINGLE 12" SPAEKER.I BELIEVE IT IS 40 WATTS.I TRACED THE CIRCUIT B+ AND GROUND AND THE CHIP THAT IS IN IT IS WRONG.ANY HELP APPRECIATED AS THERE ARE NO SCHEMATICS OUT THERE FOR THIS AMP.WISH I HAD ONE!!..THANKS FOR ANY HELP......ED!!!