Thanks Mijknarf,
My old cdp is indeed a 2-pronged plug (Yamaha carousel). Although I am not positive that the hum is not a problem of the supply power on my end and not an internal problem with the unit I don’t think it’s on my end. I have tried both standard utility power (110v) and a power system that incorporatea a 5 kva copper wound isolation transformer 230v primary and 110v secondary witch feeds a 125amp sub panel. The center tap of the transformer derives the neutral and ground and does not have a physical tie to the utility company, rather a grounding electrode system made of (4) 3/8” 8’ driven ground rods and develops the ground reference from that (no grounding or grounded tie no utility “noise”) 4 separate dedicated 20amp circuits serve my components each with #10 grounding conductor using #10 stranded wire from sub panel, terminated with sta-con spades connectors to Leviton hospital grade 20amp receptacles. The transformer is active and pulls almost 8 amps at idle so I installed a contactor ahead of the transformer with a 120-volt coil wired to a single pole switch to turn the system off when not in use. Although this system is not NEC compliant (don’t try this at home) is has worked wonders in terms of power quality and got rid of a nasty ground loop I had on my turntable for years. Nonetheless the Jolida when powered by the utility company or the transformer hums like…. er……. well it hums. Any problems with the reverse on your unit??? I did try removing the video connections to my HTR with no success. Thanks again!! T. J.
My old cdp is indeed a 2-pronged plug (Yamaha carousel). Although I am not positive that the hum is not a problem of the supply power on my end and not an internal problem with the unit I don’t think it’s on my end. I have tried both standard utility power (110v) and a power system that incorporatea a 5 kva copper wound isolation transformer 230v primary and 110v secondary witch feeds a 125amp sub panel. The center tap of the transformer derives the neutral and ground and does not have a physical tie to the utility company, rather a grounding electrode system made of (4) 3/8” 8’ driven ground rods and develops the ground reference from that (no grounding or grounded tie no utility “noise”) 4 separate dedicated 20amp circuits serve my components each with #10 grounding conductor using #10 stranded wire from sub panel, terminated with sta-con spades connectors to Leviton hospital grade 20amp receptacles. The transformer is active and pulls almost 8 amps at idle so I installed a contactor ahead of the transformer with a 120-volt coil wired to a single pole switch to turn the system off when not in use. Although this system is not NEC compliant (don’t try this at home) is has worked wonders in terms of power quality and got rid of a nasty ground loop I had on my turntable for years. Nonetheless the Jolida when powered by the utility company or the transformer hums like…. er……. well it hums. Any problems with the reverse on your unit??? I did try removing the video connections to my HTR with no success. Thanks again!! T. J.