yairf
Trade: Teddy Pardo Audio
Hi all
I'm not sure if this has been discussed here more than a dozen times, if it has, please feel free to close the thread.
It's been ages since the standard power feed for Naim's preamp circuits is +24v and the return is 0v, the same 0v that is used for signal grounding, which is the root cause of Naim's grounding fuss.
There's no argue that feeding a circuit with a dual-rail (+/-V) makes for a lower noise floor comparing with positive only, for the simple reason that the power feed return is separated from the signal ground. Naim has done this with the 552 preamp and it's dedicated power supply. I cant tell for sure, but I would imagine they mainly converted the NAC-52 into a +/- configuration.
I have tried that in the past with NA-324 buffer, NA-323 phonostage as well as Avondale's A821 board, all applied as stand alone boards, i.e. not within the context of a working Naim preamp. It does require careful stitching, but when done properly, it always yielded excellent results.
I wonder if anyone here tried applying this approach to a fully working preamp. It should be fairly easy to do with the older generations, such as 32/72 or maybe 42, but rather tricky with newer ones such as 102 etc.
Cheers, Yair
I'm not sure if this has been discussed here more than a dozen times, if it has, please feel free to close the thread.
It's been ages since the standard power feed for Naim's preamp circuits is +24v and the return is 0v, the same 0v that is used for signal grounding, which is the root cause of Naim's grounding fuss.
There's no argue that feeding a circuit with a dual-rail (+/-V) makes for a lower noise floor comparing with positive only, for the simple reason that the power feed return is separated from the signal ground. Naim has done this with the 552 preamp and it's dedicated power supply. I cant tell for sure, but I would imagine they mainly converted the NAC-52 into a +/- configuration.
I have tried that in the past with NA-324 buffer, NA-323 phonostage as well as Avondale's A821 board, all applied as stand alone boards, i.e. not within the context of a working Naim preamp. It does require careful stitching, but when done properly, it always yielded excellent results.
I wonder if anyone here tried applying this approach to a fully working preamp. It should be fairly easy to do with the older generations, such as 32/72 or maybe 42, but rather tricky with newer ones such as 102 etc.
Cheers, Yair
821A PreAmp