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
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
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
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
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
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
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
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
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
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
or if its not so good to see
after the input selector from the LSQR3 you have the possibilitiy to loop in the aleph ore something else
(from the lsqr3 to the aleph p and back to the lsqr3)
...some have it some not...
...if you have problems with distortion with the preamp try 221ohm at input from the aleph p worked wonders in my case.
after the input selector from the LSQR3 you have the possibilitiy to loop in the aleph ore something else
(from the lsqr3 to the aleph p and back to the lsqr3)
...some have it some not...
...if you have problems with distortion with the preamp try 221ohm at input from the aleph p worked wonders in my case.
from service manual:
Distortion < 1% THD
Max Out 20 volts rms.
bal out 10 volts rms. unbal out
-if i remember right ask generic he maybe had made some messurements
-or build this pre, mostly you will not regret
only thing you maybe think about if you have a clone is:
-> will the orginal AlephP sound better?
this can drive you
nuts
Max Out 20 volts rms.
bal out 10 volts rms. unbal out
-if i remember right ask generic he maybe had made some messurements
-or build this pre, mostly you will not regret
only thing you maybe think about if you have a clone is:
-> will the orginal AlephP sound better?
this can drive you
nuts 
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