Are you using balanced interconnects? When I had a Meridian amp, if I used balanced IC's, I had to put in shortening plugs in the RCA jacks or else I would get a hum.
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You have a ground feedback loop or are picking up hash from adjacent power cords, etc. First have a look and make sure you have hooked up OK, make sure all connections are good and tight and correct. Then (with power still off) disconnect the source interconnect, power up and see if you still have the hum. If not, then the hum loop is from the source side, if yes then you have to look at the output side. This means you are picking up thru the cables unwanted signal from adjacent power cords or transformers (large ones powering tube amp..???) and therefore you will have to "dress" the cables (get them away from power cords and sources, etc) and avoid unneccessary loops in the cable. Keep the cables at 90 degrees when they have to cross other cords and make sure they go straight out and away from the amp before they head off in the direction of your speakers. Hope this helps you, regards Richard
Hi Brian, The quickest and easiest thing to try in addressing the ground loop problem would be to inatall "cheater plugs" on the amp's AC cords so as to float the ground pin. You can pick them up for a couple of dollars if you don't have them on hand. I had the same problem with the SE 100s and the "cheater plugs" cured it instantly. Good Luck!
Thank you for the quick responses. One think I forgot to mention is that the cary preamp has been working with my Hafler DH200 with the same equiptment in the same setup for over a year. This may not change you respective advices but i thought i should mention it. Cheater Plugs, where can i pick them up? and are these used to fix polarity problems? Thanks again all. Cheater
Hey, Ralph Nader, thanks for that hair-raising anecdote. I think we can agree that it's certainly tragic when good beer goes to waste. :) I guess I'll just have to install a dedicated earth ground for all my audio gear. If your heads-up prevents just one more drop of beer from being spilled then... Sniffle... I'm sorry, I just can't go on... Thank you and may God bless! Seriously though, you raise a valid issue. People do get struck by lightning, win the lottery, and get shocked with the potential to be badly injured from touching improperly grounded gear during major malfunctions when current shunts to the chassis.
Not meaning to beat around the Busch, but are you sure this guy didn't spill a little beer into the powered-up amp before he touched it? How many did he chug down anyway. I have to apologize for my indefensible flippancy, but I've always held that drinking and critical listening don't mix--and this is just another classic example to support my case. :)
Plato (aka the fountain of wisdom): I'm unsure about how many beers this guy had chugged before, or whether he intended to share his beer with the amp. Needless to say, had you been in his position, the jolt would have done nasty things to your toga, O Wise One ! BTW, I agree that drinking and critical listening do not mix, but this guy was at a party, and his critical faculties were no doubt not at their best. The correct way to fix a ground loop is to interrupt the loop, but not at the chassis ground. Sorry, but I am cautious and do not believe in cheaters, even if they work.