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Old 15th October 2008, 08:33 PM   #771
juma is offline juma  Serbia
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Default Re: Re: would this work?

Quote:
Originally posted by Zen Mod

is this good ?

You need a small load resistor (RD in attached schematic ) on upper FET's drain so that cap can take that voltage swing down to lower FET's gate in order to modulate the CCS (Aleph's CCS does the similar thing)
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Old 15th October 2008, 08:38 PM   #772
Zen Mod is offline Zen Mod  Serbia
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Default Re: Re: Re: would this work?

Quote:
Originally posted by juma



You need a small load resistor (RD in attached schematic ) on upper FET's drain so that cap can take that voltage swing down to lower FET's gate.

nope ;

that cap is just for injecting noise from PS rail ;

at least seems logical to me - if ya can beat them , join them
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Old 15th October 2008, 09:32 PM   #773
juma is offline juma  Serbia
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Default Re: Re: Re: Re: would this work?

Quote:
Originally posted by Zen Mod

that cap is just for injecting noise from PS rail ;

Aaahh, you want noisy CCS - to make buffer sound more "analog like" - yesss, what's music without noise, right ?
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Old 15th October 2008, 09:36 PM   #774
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Quote:
I was thinking of the problem with the low psrr of the White jfet topology.
Better to have clean supply.
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Old 15th October 2008, 09:44 PM   #775
Zen Mod is offline Zen Mod  Serbia
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Default Re: Re: Re: Re: Re: would this work?

Quote:
Originally posted by juma



Aaahh, you want noisy CCS - to make buffer sound more "analog like" - yesss, what's music without noise, right ?



yup - same as those headphones without cord ( workers in noisy
areas) ...... noise and anti-noise .....

anyway - I'm curious - Vaistiny Konza is - where ?

are you in tuzemstvo or inozemsvo ?

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Old 16th October 2008, 06:48 AM   #776
sparky6 is offline sparky6  Canada
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Default B1

Hi all,

I'm new to the forum and I'm not sure if this is the best thread to ask this question.

I've been using a Goldpoint SA4 level control between an Aragon D2A2 and an Aragon 8008BB. I've been wondering If I'd be better off with bit of gain instead. If so, would the B1 be the way to go? What would be the advantages over passive?

Thanks...
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Old 16th October 2008, 07:32 AM   #777
stein2 is offline stein2  Serbia
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Default Re: B1

Quote:
Originally posted by sparky6
Hi all,

I'm new to the forum and I'm not sure if this is the best thread to ask this question.

I've been using a Goldpoint SA4 level control between an Aragon D2A2 and an Aragon 8008BB. I've been wondering If I'd be better off with bit of gain instead. If so, would the B1 be the way to go? What would be the advantages over passive?

Thanks...
B1 is a buffer stage, no gain in signal. If you think but not sure if you need gain, take a single pot, add some coax with terminals at both ends and try with passive volume only between your source (CD for example) and power amp. If you get enough output from source to fully drive the power amp, B1 should do. If you can go with the single pot all the way and feel that the amp lacks output power, then, some gain in the control/preamp unit would help. In that case, you might consider NS10 with a proper, modern shunt PSU... like some of us did

Threshold NS10 Lineamp PCB

and NS10 with Shiny PS
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Old 16th October 2008, 08:52 AM   #778
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OK guys,
here I am fat dumb and happy thinking I'm gonna build me a B1 to put into the system to replace the present POS preamp I have.
Now the hornets nest gets stirred a little and I hear (read) about Pumpkins and NS10's and ShinyPS's of which I know nothing about. I have no Pumpkin boards on order nor Shinnies nor do I know if I'll be able to obtain one should I need one. I feel like I got off the elevator on the fifth floor. I get the feeling I will need a "preamp" when all is said and done. Would that be a "pumpkin"?

Ray

Information is not knowledge
Knowledge is not wisdom
Wisdom is not truth
Truth is not beauty
Beauty is not love
Love is not music
Music is the best !

Frank Zappa.
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Old 16th October 2008, 08:59 AM   #779
juma is offline juma  Serbia
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Default Re: Re: Re: Re: Re: Re: would this work?

Quote:
Originally posted by Zen Mod

anyway - I'm curious - Vaistiny Konza is - where ?
are you in tuzemstvo or inozemsvo ?

Ma jok, to je lokalna fora - Munze Konza (Zemun Zakon) ! Vaistinu Konza (Zakon) ! (tako se pozdravljaju i odpozdravljaju zemunci na satrovackom)
A dal'je tuzemstvo ili inozemstvo - ostaje da se vidi !

Anyway, I don't think that noise scheme will work here - it's quite different from Broskie's implementation in Aikido preamp. Furthermore, B1 doesn't need it - it has a very good intrinsic PSRR already. I know what would make you happy - nice, hot, glowing 6SN7 as WCF
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Old 16th October 2008, 09:10 AM   #780
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by brutepuppy
OK guys,
here I am fat dumb and happy thinking I'm gonna build me a B1 to put into the system to replace the present POS preamp I have.
Now the hornets nest gets stirred a little and I hear (read) about Pumpkins and NS10's and ShinyPS's of which I know nothing about. I have no Pumpkin boards on order nor Shinnies nor do I know if I'll be able to obtain one should I need one. I feel like I got off the elevator on the fifth floor. I get the feeling I will need a "preamp" when all is said and done. Would that be a "pumpkin"?

Ray

Information is not knowledge
Knowledge is not wisdom
Wisdom is not truth
Truth is not beauty
Beauty is not love
Love is not music
Music is the best !

Frank Zappa.

help us to help you.
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