Hmm, where to start, first, shoulda kept the Sota.
1st the obvious, I assume this only happens in phono, and not in other inputs????
If so: Look first to the cables, and ROUTING, if they are within a foot at any point of AC cables you have problem.
2) Keep you phono cables short, consider moving to a non-AC pre-preamp, like a Chamelot Lancelot which has a battery, but more important, can be place at the outputs of the table and limited to about 12" of cable. The signal is then amplified and is much less prone to HMMMMMMM
3) Have you looked at your pre-amp??? The Chamelot or another phono head amp will allow you to bypass the phono stage in your pre-amp altogether. A battery powered pre will also eliminate the potenetial for ground loops which is what you have.
4) Digital glare even on great CD decks is well, to me just not acceptable. The only place for CD's is in the car.
5) Use a cheater plug if needed for experiementation and swap the polarity of you pre-amp, then back, then the power amp, then back. Caution, allow the cap in the power amp to cycle down prior to swapping polarities, I'd let it go at least 10 minutes. Those amps with inadequate protection and LARGE caps can take oppostion to the quick discharge via reversed polarity. Can you say POP!!!
6) A poor contection somewhere in the pre-amp can cause these problems as well.
Remove the phono from the equation. With just the cables going into the pre-amp, not connected to the TT do you still have humm??? If so move the cables around and see if it helps.
That ought to get you started, post the results and we'll go from there.
good luck,
BTW in the future when your disposing of your analogue equipment let me know. I love a deal.
loon
1st the obvious, I assume this only happens in phono, and not in other inputs????
If so: Look first to the cables, and ROUTING, if they are within a foot at any point of AC cables you have problem.
2) Keep you phono cables short, consider moving to a non-AC pre-preamp, like a Chamelot Lancelot which has a battery, but more important, can be place at the outputs of the table and limited to about 12" of cable. The signal is then amplified and is much less prone to HMMMMMMM
3) Have you looked at your pre-amp??? The Chamelot or another phono head amp will allow you to bypass the phono stage in your pre-amp altogether. A battery powered pre will also eliminate the potenetial for ground loops which is what you have.
4) Digital glare even on great CD decks is well, to me just not acceptable. The only place for CD's is in the car.
5) Use a cheater plug if needed for experiementation and swap the polarity of you pre-amp, then back, then the power amp, then back. Caution, allow the cap in the power amp to cycle down prior to swapping polarities, I'd let it go at least 10 minutes. Those amps with inadequate protection and LARGE caps can take oppostion to the quick discharge via reversed polarity. Can you say POP!!!
6) A poor contection somewhere in the pre-amp can cause these problems as well.
Remove the phono from the equation. With just the cables going into the pre-amp, not connected to the TT do you still have humm??? If so move the cables around and see if it helps.
That ought to get you started, post the results and we'll go from there.
good luck,
BTW in the future when your disposing of your analogue equipment let me know. I love a deal.
loon