Regulate HV preamp with floating LM317?

kacernator · 26th January 2010, 01:37 PM

Hi,

I have working all-octal Aikido headphone amplifier. Would there be benefit regulating the power supply with floating LM317 like this:
http://www.diyaudio.com/forums/attac...voltsupply.gif

I know I would probably gain more tighter bass and less PS ripple. But are the overall sonics better with or without this floating LM317?

Thank you.

Arnulf · 26th January 2010, 04:39 PM

What kind of benefit ? Aikido is suppsoed to have superb PSRR (according to its author, at least). Why bother with additional voltage regulation then ?

If you're encountering noise from B+, you should IMO make sure that noise injection is working properly, with correct magnitude.

SY · 26th January 2010, 05:17 PM

If you have PS noise in the circuit (the PSR of the Aikido is good, but not anywhere near perfect), it may be of some help; I regulated one of mine just for that reason. If your rails aren't bouncing around and the preamp is quiet, it's probably not worth the bother.

kacernator · 26th January 2010, 05:43 PM

Preamp is quiet. I thought about regulation just for sonic benefit. Good shunt regulation would gain gain sonics benefits for sure, but I am not sure about floating LM317 series regulator.

SY · 26th January 2010, 05:47 PM

Nope, most of the sonic improvements come from the choice of tube and operating conditions; as long as the power supply is reasonably quiet and your line voltages don't vary much, the reg is a "nice to have" but not a game-changer.

kacernator · 26th January 2010, 05:51 PM

I know that using regulator will not drastically change sound. But if this series regulator will improve already good sound then I will do it.

26th January 2010, 01:37 PM	#1
kacernator diyAudio Member Join Date: Jan 2008	Regulate HV preamp with floating LM317? Hi, I have working all-octal Aikido headphone amplifier. Would there be benefit regulating the power supply with floating LM317 like this: http://www.diyaudio.com/forums/attac...voltsupply.gif I know I would probably gain more tighter bass and less PS ripple. But are the overall sonics better with or without this floating LM317? Thank you.

26th January 2010, 05:17 PM	#3
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	If you have PS noise in the circuit (the PSR of the Aikido is good, but not anywhere near perfect), it may be of some help; I regulated one of mine just for that reason. If your rails aren't bouncing around and the preamp is quiet, it's probably not worth the bother. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

26th January 2010, 05:47 PM	#5
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Nope, most of the sonic improvements come from the choice of tube and operating conditions; as long as the power supply is reasonably quiet and your line voltages don't vary much, the reg is a "nice to have" but not a game-changer. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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26th January 2010, 04:39 PM	#2
Arnulf diyAudio Member Join Date: Feb 2009	What kind of benefit ? Aikido is suppsoed to have superb PSRR (according to its author, at least). Why bother with additional voltage regulation then ? If you're encountering noise from B+, you should IMO make sure that noise injection is working properly, with correct magnitude.

26th January 2010, 05:43 PM	#4
kacernator diyAudio Member Join Date: Jan 2008	Preamp is quiet. I thought about regulation just for sonic benefit. Good shunt regulation would gain gain sonics benefits for sure, but I am not sure about floating LM317 series regulator.

26th January 2010, 05:51 PM	#6
kacernator diyAudio Member Join Date: Jan 2008	I know that using regulator will not drastically change sound. But if this series regulator will improve already good sound then I will do it.

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