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Hum or buzz through speakers

I just turned over my system from all B&K to Audio research and McCormack. I was running the Audio Research through the B&K until Monday when I put the McCormack DNA-1 in place. I am hearing a hum or buzz through my Vandersteen's audible from three feet away. Preamp is ARC SP9MK2. Tubes are 6922 Golden Dragons which I am going to change over to some Amperex 7308 USN-CEP. Would this be tube noise that perhaps the McCormack is picking up where the B&K did not or is there something in the McCormack amp that would cause this.

Eagleman
eagleman6722
newbee
4,767 posts
 
If the input sensitivity of the McCormack is higher than the B&K it is quite possible that, as Steve Mc said, you are now hearing the noise floor of your pre-amp a bit more than before, although usually this is more hiss than buzz. See what happens when you change tubes, I suspect you will like the tone of the Amperex's much more (assuming that they are low noise tubes.) At least you can't hear it from more than 3ft away...........:-)
eagleman6722 OP
217 posts
 
Well guys, I tried everthing that i could think of and finally took the TAD-150 to a local hi-fi outlet to see if the buzz and hum was present on their systems. Turned out that the same noise was present there so i will be sending back to Bizzy-Bee to repair. Meanwhile i will run my ARC P9 MK2 with the Amperex tubes and wait for the TAD. The only noise I get with this combo is a slight hiss or buzz when i put my ear right next to the speaker. Seems minor. Anyway, thanks for the advice....
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timson
6 posts
 
I just switched out my B & K M200's to Rogue M120's. I had the same problem "the 60HZ" hum. I tried everything, and it was driving me crazy. I had the amps going through an Adcom Ace 515, took out it's ground still nothing, then as a last resort, I eliminated the Ace and went direct to the outlet with no gound (Took it off in the box and insulated it)I have the Pre and CDP on another line... the hum is almost gone, all but some very minor residual amp/tube noise. Good luck I know what your going through.
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