Does quality of negative voltage regulation matter

Dr.H · 23rd July 2009, 08:59 AM

I've found that better quality, lower noise regulation of the positive rail always brings benefits, be it in cd players, amps, pre-amps etc.

Question: Does improving the negative voltage regulation bring benefits or is it not worth the effort?

analog_sa · 23rd July 2009, 09:29 AM

If you have a look at PSRR of opamps per example you'll notice the negative supply rejection is commonly better than the positive by 10-20db. IME this doesn't necessarily mean that you won't hear a difference between a Jung superreg and a 337. I was recently shocked to discover that a leading manufacturer uses a sophisticated superreg-type circuit to power the B+ of a differential tube pair and a 337 for the negative supply, obviously assuming that a CCS in the tail will make the 337 invisible. I built it using a 337 and later replaced this with a Jung. Obvious improvement.

Dr.H · 23rd July 2009, 01:10 PM

Thanks analog_sa

23rd July 2009, 08:59 AM	#1
Dr.H diyAudio Member Join Date: Apr 2002	Does quality of negative voltage regulation matter I've found that better quality, lower noise regulation of the positive rail always brings benefits, be it in cd players, amps, pre-amps etc. Question: Does improving the negative voltage regulation bring benefits or is it not worth the effort?

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23rd July 2009, 09:29 AM	#2
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	If you have a look at PSRR of opamps per example you'll notice the negative supply rejection is commonly better than the positive by 10-20db. IME this doesn't necessarily mean that you won't hear a difference between a Jung superreg and a 337. I was recently shocked to discover that a leading manufacturer uses a sophisticated superreg-type circuit to power the B+ of a differential tube pair and a 337 for the negative supply, obviously assuming that a CCS in the tail will make the 337 invisible. I built it using a 337 and later replaced this with a Jung. Obvious improvement.

23rd July 2009, 01:10 PM	#3
Dr.H diyAudio Member Join Date: Apr 2002	Thanks analog_sa

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