Hello. I just installed a three prong cord on my K200-B6 and it made the amp buzz more. I unhooked the ground loop from the chassis and the buzzing stopped (the buzzing sounded like when the power switch is in a reverse polarity mode that buzzes more, and I attached the ground loop to the cord wrap bolt on the back of the chassis). I have performed this exact same mod on my K200-A5 with no problems, which I find strange. Any ideas? Thanks!
Hello. I used a standard pre-molded 16/3 25 ft. cord I cut down to 20 ft. I disconnected the ground lug and taped it off because the buzzing was terrible. I also noticed when the switch is in the position that it is quieter in, I got shocked soemtimes, but when its in the other more noisy position, I don't get shocked at all; perhaps a correlation? Any ideas? Thanks!
Hello. Someone on the TDPRI forum reccomended this and it worked! Here's what he said:
"...look at your polarity switch on the Kustom and you will find a capacitor installed between a lug on the switch and ground. This cap was necessary when you didn't have the chassis ground installed to provide an AC ground path. With your chassis ground hooked up, it's causing a ground loop. Remove the cap, and reinstall your chassis ground. The cap serves no purpose with a proper chassis ground installed."
Hello. Perhaps I spoke too soon; the previously posted idea did work to an extent, but it still buzzes more than when it didn't have a grounded cord. Any other suggestions? Thanks!
stevem Messages: 4739 Registered: June 2004 Location: NY
Senior Member
No, that will not help, unfortunatly adding the grounded cord in these older amps for shock cures does nothing for noise or hum reduction when you lose the polarity change function.You may want to look into a isolation transformer from mouser sales or others. one that can handle 3 to 4 amps output will be about 60 bucks I think.
Hello. Could you give me a part number for one? Also, do these mount inside the amp, or do you just plug the amp into them? I saw a couple diff styles on the web site, so just wondering. Thanks!