Hello HiFivers
I am currently auditioning Viren's Lync preamp. Unfortunately the new addition in my setup is creating the infamous problem of Hum. It is audible when listening to music during the quieter passages and also interferes in late night low level listening. It is a very smooth Brrrr kind of mid to low freq noise when playing. With nothing playing it is better described as a buzz. Let me detail the things I tried to fix it.
1. Connect a thin single core wire from metal contact on preamp to the Amp - No change
2. Connect the wire from metal chassis of pre or amp to window grill - No change
3. Disconnect preamp and CDP from mains leaving only the amp powered on - no change
4. Remove preamp<>amp RCA cable. Hum gone but obviously this is not a solution
5. Use 3 pin socket without earthing pin on Pre (since amp and CDP have no earthing ground pin) - No change
Until yesterday morning there was only the faint buzzing hum from the speakers. Since last night when I first switch on the preamp, the hum triples in volume then fades away to the original level by 15 secs. Likewise when I switch off the preamp, the hum disappears completely (yipee!) - but the buzz returns after 15secs.
6. On day one, switching on CDP resulted in the loud initial hum as above, but it is not affecting since yesterday night.
I tried lifting the CDP away at a distance from the pre and the noise varies with distance. I've now placed the preamp one empty rack below the CDP. There was in improvement in imaging and SQ. Varying the distance from preamp and amp (within reasonable limits) had no effect on buzz or SQ.
Edit: The distance between top of bottom shelf and bottom of upper shelf is 7 inches. The MDF is 16mm.
Request your suggestions on fixing this vexing problem.
TIA
Regards
I am currently auditioning Viren's Lync preamp. Unfortunately the new addition in my setup is creating the infamous problem of Hum. It is audible when listening to music during the quieter passages and also interferes in late night low level listening. It is a very smooth Brrrr kind of mid to low freq noise when playing. With nothing playing it is better described as a buzz. Let me detail the things I tried to fix it.
1. Connect a thin single core wire from metal contact on preamp to the Amp - No change
2. Connect the wire from metal chassis of pre or amp to window grill - No change
3. Disconnect preamp and CDP from mains leaving only the amp powered on - no change
4. Remove preamp<>amp RCA cable. Hum gone but obviously this is not a solution
5. Use 3 pin socket without earthing pin on Pre (since amp and CDP have no earthing ground pin) - No change
Until yesterday morning there was only the faint buzzing hum from the speakers. Since last night when I first switch on the preamp, the hum triples in volume then fades away to the original level by 15 secs. Likewise when I switch off the preamp, the hum disappears completely (yipee!) - but the buzz returns after 15secs.
6. On day one, switching on CDP resulted in the loud initial hum as above, but it is not affecting since yesterday night.
I tried lifting the CDP away at a distance from the pre and the noise varies with distance. I've now placed the preamp one empty rack below the CDP. There was in improvement in imaging and SQ. Varying the distance from preamp and amp (within reasonable limits) had no effect on buzz or SQ.
Edit: The distance between top of bottom shelf and bottom of upper shelf is 7 inches. The MDF is 16mm.
Request your suggestions on fixing this vexing problem.
TIA
Regards
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