Aleph P 1.7 Volumecontrol Output-imendance question - diyAudio
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Old 7th January 2014, 01:30 PM   #1
Epsen is offline Epsen  Germany
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Default Aleph P 1.7 Volumecontrol Output-imendance question

Hello DIY-A World

At first, excuse my bad english please. I have here the boards and almost all parts lying around for building a lsqr3 (here an Link, unfortunately in german ) and for the aleph p 1.7 preamp (Veteran´s Bords). Now I have any questions:

1. Harmonize these volume attenuator bords ( is set up as a 10k version)?

2. I has read that the attenuator after the amplifier stage comes,

3. the input impedance of the lsqr is always constant if I read correctly , the output impedance as well? How behaves the normal potentiometers potentiometers or shunt ? Since it is actually the output impedance less if more " turning up " .

4. The output impedance , I know 0-800 Ohms unbalbal. but how to calculate it? The optimum at source and sink was supposed to be 1:10. Where is my mistake?

Best Regards

Thomas

Sorry for, if it is an stupid question But its my first preamp and my first device from Mr. Pass
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Old 7th January 2014, 01:37 PM   #2
Zen Mod is offline Zen Mod  Serbia
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even if I generally have idea what you are asking , small details are still above my head , mostly because of difference of your's and mine Engrish

try to contact any of older Greedy Boyz* from Germany , they will be able to help you in both language and tech. answers

* meaning - Pass Labs Forum residents
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Old 7th January 2014, 01:54 PM   #3
Epsen is offline Epsen  Germany
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Hello Chocky

yes, i can write it in german, but that does not help you I think
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Old 7th January 2014, 02:21 PM   #4
Zen Mod is offline Zen Mod  Serbia
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you have two options :

- write here in Engrish , but add German too ; that will be perfect - I'm reading German so-so but , most importantly - Jaccolina is speaking German same as he is Generg's brother

-send personal message to any of mentioned members , having German flag
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Old 7th January 2014, 02:27 PM   #5
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generg also got this preamp if i remember correctly.
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Old 7th January 2014, 02:30 PM   #6
Zen Mod is offline Zen Mod  Serbia
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yup

he's da Man - knowing much more then he is usually showing
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Old 7th January 2014, 02:55 PM   #7
Epsen is offline Epsen  Germany
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hehe, ok i write him. I hope he can catch up my question
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Old 7th January 2014, 05:10 PM   #8
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I think i know what you mean.

to 1. yes you could use this boards together i have done this too.
I have 5k behind the aleph but 10k should work to
had tryed 10k behind the bosoz worked also
(Ja... läuft tu es )
to 2. you can do it both ways in front of the aleph ore behind

to 3. should be correct what you sayed
to 4. so far i know 0-800ohm is with the org. aleph attenuator.
with lsqr3 at output you should have same impedance like your lsqr3

hopefully i could help with my terrible english

Quote:
Originally Posted by Epsen View Post
Hello DIY-A World

At first, excuse my bad english please. I have here the boards and almost all parts lying around for building a lsqr3 (here an Link, unfortunately in german ) and for the aleph p 1.7 preamp (Veteran´s Bords). Now I have any questions:

1. Harmonize these volume attenuator bords ( is set up as a 10k version)?

2. I has read that the attenuator after the amplifier stage comes,

3. the input impedance of the lsqr is always constant if I read correctly , the output impedance as well? How behaves the normal potentiometers potentiometers or shunt ? Since it is actually the output impedance less if more " turning up " .

4. The output impedance , I know 0-800 Ohms unbalbal. but how to calculate it? The optimum at source and sink was supposed to be 1:10. Where is my mistake?

Best Regards

Thomas

Sorry for, if it is an stupid question But its my first preamp and my first device from Mr. Pass
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Old 7th January 2014, 05:40 PM   #9
Epsen is offline Epsen  Germany
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Hello Danger, Danke

when the Impendance of the volume attenuator is constant (input 10 K and Output 10 K) maybe its better to use it before the Aleph-P-stage? I hope the output imedance of the Pre is lower in this way, because 10k Outputimedance is very high to drive longer cables (inputimbedance of used Poweraps is 20k).

What are the cons when i do this?


Regards

Thomas
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Old 7th January 2014, 06:33 PM   #10
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don't put the attenuator before the aleph. that will result in a noisy preamp. there is a reason that it is behind
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