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Old 24th April 2013, 04:04 PM   #21
Zen Mod is offline Zen Mod  Serbia
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more voltage , more oohmps ;

however , don't go bellow 24 and certainly not more than 30V , without cascoding

in your boots , I would go with 24 , heavily ( read - shunt ) reg-ed
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Old 24th April 2013, 04:10 PM   #22
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But if it is not the same rail as F4, it doesn't matter I can go any way from 24 to 30. It wil be a separate transformer, so what is the best 28V? The only thing is: remember distortion curves Pa posted in his paper? More voltage less THD, right?

He never makes labels and legends for his graphs! Bad I am reviewing papers in different journals, I would change it! :-) :-)
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Old 24th April 2013, 04:14 PM   #23
Zen Mod is offline Zen Mod  Serbia
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I just said - I would go with 24V , regged , as general purpose preamp

28V sounds fine , if F4 is in combination

nice compromise between possible swing and input Jfets dissipation
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Old 25th April 2013, 11:47 AM   #24
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Madisound is having a sale on ClarityCaps. There are several line SA, ESA, MR. How critical a part is this? Anyone think you will hear a difference? 10 mfd SA is ~$10 and they go up from there.
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Old 25th April 2013, 12:22 PM   #25
Zen Mod is offline Zen Mod  Serbia
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pick your own poison

whatever you do , try MKC ( polycarbonate ) bypass

me , as stubborn , will use Elna Silmic + MKC

in fact - would not use any cap there - would make a servo or something , to keep it DC
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Old 25th April 2013, 10:52 PM   #26
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Why would you? Better sound or other?
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Old 25th April 2013, 11:19 PM   #27
6L6 is offline 6L6  United States
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Yes, you will likely hear a difference in caps. It's a fantastic place to experiment and hear what different caps sound like.

Silmic and MKC would probably be awesome, if you can find the Wima MKC. Clarity Caps are very good. Again, use this place to experiment/educate yourself as to how things sound.


ZM - Can you accept PayPal yet to sell Shunty?
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Old 25th April 2013, 11:37 PM   #28
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Shunty? Serbian PSU good for BA-3?
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Old 26th April 2013, 01:05 AM   #29
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you bet
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Old 26th April 2013, 11:04 AM   #30
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I'd recommend a Shunty if you can get one; if you can't, you could make make a good sounding regulator using a standard 2 device constant current source and a TL431 configured as a high current shunt regulator - see the data sheet - you could also swap the BJT for a FET - if you do, don't forget to add a 220R gate resistor.

Add a pre reg if you need to drop some voltage, this will also help to reduce the power dissipation in the shunt.

You can flip the symmetry of the pre reg and constant current source for the neg rail, but not the shunt, which won't make a difference to the performance, but some people can get a bit overly anal about symmetry.

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