Kingston
Well-known member
Hello,
I'm trying to sort out some 50hz hum problems on my two channel NYD two bottle preamp. The one solution that gets most commonly suggested is to convert the raw 6.3VAC heater, grounded with 100ohm resistors, to 6.3VDC. I couldn't find one single answer here on prodigy pro everyone would agree with, as there seems to be different schools of thought on the issue.
First of all, should it be rectified and filtered only, or should I also regulate it?
What about grounding of DC heaters? Do I just use the ground rail common to all of the preamp?
The PSU is specified as 6,3VAC 3A, of which the tubes use just under 2A in the 2 channel two bottle. Would this prove a problem in converting to DC?
Cheers,
Michael
I'm trying to sort out some 50hz hum problems on my two channel NYD two bottle preamp. The one solution that gets most commonly suggested is to convert the raw 6.3VAC heater, grounded with 100ohm resistors, to 6.3VDC. I couldn't find one single answer here on prodigy pro everyone would agree with, as there seems to be different schools of thought on the issue.
First of all, should it be rectified and filtered only, or should I also regulate it?
What about grounding of DC heaters? Do I just use the ground rail common to all of the preamp?
The PSU is specified as 6,3VAC 3A, of which the tubes use just under 2A in the 2 channel two bottle. Would this prove a problem in converting to DC?
Cheers,
Michael