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Old 19th August 2008, 12:48 AM   #1
maxpou is online now maxpou  Canada
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Default Shunt or serie volume control

Hi Guys,
I would like to know if i change my volume control ( Black beauty ) by stepped attenuator Elma, will I improve a lot my sound quality? And if yes what's the best shunt or serie. it's my preamp at this link post 32:
http://www.diyaudio.com/forums/showt...69#post1541169

Thank you in advance! Maxpou
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Old 19th August 2008, 01:02 AM   #2
Zen Mod is offline Zen Mod  Serbia
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Default Re: Shunt or serie volume control

stepped is always better than plain pot

you'll hear difference as much your next stage is good ;

real shunt is always better than plain series
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Old 19th August 2008, 01:44 AM   #3
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alps black beauty is a stereo rotary switch with laser trimmed resistors, unless its a fake (there are plenty counterfeits) .
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Old 31st August 2008, 06:05 PM   #4
maxpou is online now maxpou  Canada
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Thank you guys for reply,
but the shunt stepped attenuator change my input impedance and change the sound too depending Charles Hansen, but if i read the borbely document he said there was no difference. Somebody can tell me who said true? Thank you! Maxpou
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Old 20th September 2008, 08:00 PM   #5
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Nobody can help me?
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Old 21st September 2008, 10:09 AM   #6
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maxpou,
is this your best shot for a good sounding circuit? I would in the first place make topological changes to get significant improvement.
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Old 21st September 2008, 12:07 PM   #7
maxpou is online now maxpou  Canada
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Quote:
Originally posted by Lumba Ogir
maxpou,
is this your best shot for a good sounding circuit? I would in the first place make topological changes to get significant improvement.
Hi,
thank you for reply Lumba Ogir, what do you want to change for improvement? thank you Maxpou
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Old 21st September 2008, 12:22 PM   #8
AndrewT is offline AndrewT  Scotland
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investigate the much simpler Pedja or Pass B1 buffers.
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Old 21st September 2008, 12:39 PM   #9
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maxpou, this is my guess:

> You should change it, so it will be like one of Lumba Ogir JFET amplifiers
... the only drawback, is that it will no longer be your design
Lumba Ogir JFET amp circuits & projects topics,
which we have seen plenty many of (do I need to provide links?)
are those that can work very well and so not get critical comment from Lumba.
In fact, they are above John Curl class, if I have understood Lumba's posts correctly.


Personally, I like your amplifier very much.
You have done most everything possible to improve JFET Stages.
Using cascodes.
Maybe you have mentioned what Supply voltage you use?
It is not in schematic
http://www.diyaudio.com/forums/attac...amp=1213720316

My guess is like +- 18-20 Volt, regulated.
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Old 21st September 2008, 12:44 PM   #10
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maxpou,
are you sure you need any voltage gain?
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