I have a Jolida 302 brc. I love the amp but when I first got it I had a ground loop hum. I tried everything couldn't get rid of it. Finally I purchased a PS Audio power cord that has a ground pin that can be removed. I removed the ground pin and the hum disappeared. I know you don't want to do this but you could get a three to two adaptor they are sold everywhere (buy two one for each amp). That will tell you if it's the problem. There are amplifiers sold with ground lift switches, so I think this is a common problem and amp manufacturers think it a safe solution. I bought an outlet tester three LED lights will tell you if the outlet is wired correctly. My outlets are wired correctly, I am confident my amp will be fine. Love the Jolida but when I'm ready the Quicksilvers will be my next purchase!
Insane ground loop; anybody wanna try?
I have a ground loop that's been killing me for weeks. I've tried several things to limited or no success. I've written to Mike Sanders at Quicksilver, but I'm a little chagrined to keep asking him questions that aren't really the fault of his gear.
Anybody want to have a go at solving this puzzle? It's driving me nuts, and I'd be grateful for any help.
Relevant equipment:
Rowland Capri preamp
Quicksilver Silver 60 mono amps (EL34)
Sunfire True Sub
Amps, preamp, and sub are all plugged into a Monster 2000, so everything shares a common wall outlet.
Plugging the amps into separate wall outlets has little effect either way.
Amps are damn near dead-quiet with no input, so it's shouldn't be the transformers or the tubes.
Amps plugged in to the preamp (shielded DH Labs RCA cables) hum, and the sub does too. Swapping cables has no effect.
Unplugging and reconnecting sources (a turntable and a Mac Mini via a Schiit DAC) has no effect.
Unplugging the sub has little effect (except it eliminates the hum in the sub, haha).
Lifting the ground on the amps reduces the hum — by about half, but definitely not completely.
A Hum-X has no (or very little) effect, whether placed on the preamp, an amp, or the sub.
For obvious reasons I don't want to lift the ground on the amps permanently.
I'm not an electrical engineer, but I'm a logical guy.
Ideas? I'm open to any with two requests: First, if you don't know something for sure, please say so. I don't want to play in electron traffic because somebody just guessed at a solution. And second, if you disagree with somebody, don't call him names, okay? There's more than enough gratuitous meanness in the world right now without insulting people over stereo equipment. Thanks.
Anybody want to have a go at solving this puzzle? It's driving me nuts, and I'd be grateful for any help.
Relevant equipment:
Rowland Capri preamp
Quicksilver Silver 60 mono amps (EL34)
Sunfire True Sub
Amps, preamp, and sub are all plugged into a Monster 2000, so everything shares a common wall outlet.
Plugging the amps into separate wall outlets has little effect either way.
Amps are damn near dead-quiet with no input, so it's shouldn't be the transformers or the tubes.
Amps plugged in to the preamp (shielded DH Labs RCA cables) hum, and the sub does too. Swapping cables has no effect.
Unplugging and reconnecting sources (a turntable and a Mac Mini via a Schiit DAC) has no effect.
Unplugging the sub has little effect (except it eliminates the hum in the sub, haha).
Lifting the ground on the amps reduces the hum — by about half, but definitely not completely.
A Hum-X has no (or very little) effect, whether placed on the preamp, an amp, or the sub.
For obvious reasons I don't want to lift the ground on the amps permanently.
I'm not an electrical engineer, but I'm a logical guy.
Ideas? I'm open to any with two requests: First, if you don't know something for sure, please say so. I don't want to play in electron traffic because somebody just guessed at a solution. And second, if you disagree with somebody, don't call him names, okay? There's more than enough gratuitous meanness in the world right now without insulting people over stereo equipment. Thanks.
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- 61 posts total
- 61 posts total