Is this "reduced drift" specific to a balanced design with CCS on opposite phases? I might understand that it could reduce the common-mode drift, but I still don't understand the reduced drift effect for an unbalanced push-pull stage.
Is the following a correct explanation of the drift issue?
In a push-pull output stage with an unequal number of P-fets and N-fets, a CCS can be used so that the fets are biased at the same power dissipation level. If the thermal drift characteristics of the P-fets and N-fets are different, it might be possible to adjust the CCS current differently from the drive fets to compensate for the difference in drift.
well , I can't speak instead of Papa but I can say what I'm thinking .......
as I understood your question , you were asking did that one mosfet in CCS is having exactly same Iq as any other mosfet in quadrant .......
for that I answered that I'm not believing that ...... simply because of several facts I spotted - remembering some previous iterations of X(A) amps , having big BJT as additional CCS , then simple resistor based SE load , and then mosfet based thingy in XS amps , described as variable thing (during development process)
sorry if I misunderstood your post
as I understood your question , you were asking did that one mosfet in CCS is having exactly same Iq as any other mosfet in quadrant .......
for that I answered that I'm not believing that ...... simply because of several facts I spotted - remembering some previous iterations of X(A) amps , having big BJT as additional CCS , then simple resistor based SE load , and then mosfet based thingy in XS amps , described as variable thing (during development process)
sorry if I misunderstood your post
some-advice
Hello.
I hoop this is the rihgt topic to ask the Man mimself about XA.8.
First of all I was introduced to Pass Labs via DiyAudio and My first Pass DIY Aleph X 60-70W. I loved the sound of is in combination with my Pass Aleph P Pre. First I wanted to buy the INT 30.5 but after listening from a Frend I came to conclusion that my Aleph sounded much better and want to buy something better. So I'm proud owner of my new Pass Labs XA 60.8 and have some questions about the synergy that I'm looking for.
Now after 300hrs of burn in My new Pass XA60.8 I'm not so sure about if there is a good combination of those Pre and End-Amp?
There is just very thin sound. Less “body and aliveness “ in it. I had no chance here in Poland to make some home-listening sessions before buy like with other stuff. There is only one dealer of is Top-HiFi and the only one thing he do not allow to borrow ware Pass Labs Equipment. Do not know why.
Before I buy the AMP I listened on XP-10 and some B&W 800 diamonds. The sound was ok but here at home thinks are different.
I was wondering it had something to do with my Pass Aleph P?
I have DIY speakers quipped with the finest drivers drivers from Accuton and Seas with Duelund XO. (See pic click )
I listening to all kind of music, especially Acoustic, blues and Jazz.
Can you please give me some advice what to do?
Kind regards,
Hello.
I hoop this is the rihgt topic to ask the Man mimself about XA.8.
First of all I was introduced to Pass Labs via DiyAudio and My first Pass DIY Aleph X 60-70W. I loved the sound of is in combination with my Pass Aleph P Pre. First I wanted to buy the INT 30.5 but after listening from a Frend I came to conclusion that my Aleph sounded much better and want to buy something better. So I'm proud owner of my new Pass Labs XA 60.8 and have some questions about the synergy that I'm looking for.
Now after 300hrs of burn in My new Pass XA60.8 I'm not so sure about if there is a good combination of those Pre and End-Amp?
There is just very thin sound. Less “body and aliveness “ in it. I had no chance here in Poland to make some home-listening sessions before buy like with other stuff. There is only one dealer of is Top-HiFi and the only one thing he do not allow to borrow ware Pass Labs Equipment. Do not know why.
Before I buy the AMP I listened on XP-10 and some B&W 800 diamonds. The sound was ok but here at home thinks are different.
I was wondering it had something to do with my Pass Aleph P?
I have DIY speakers quipped with the finest drivers drivers from Accuton and Seas with Duelund XO. (See pic click )
I listening to all kind of music, especially Acoustic, blues and Jazz.
Can you please give me some advice what to do?
Kind regards,
I could compare both Alpeh P1.7 and X1 side by side in my home: none of them had missing body, but X1 sounded more dynamic. You may assume that XP-series will bring another improvement.
XA60.8 is far beyond any suspicion; it sounds full and transparent, and I can't imagine that anybody won't be impressed by its sound.
Where have you bought your XA60.8? From this dealer who refuses a demonstration in your home? That's unbelievable - you are interested into a preamp for several thousend Euros and he sits in his shop like a fat worm grub doing nothing??
XA60.8 is far beyond any suspicion; it sounds full and transparent, and I can't imagine that anybody won't be impressed by its sound.
Where have you bought your XA60.8? From this dealer who refuses a demonstration in your home? That's unbelievable - you are interested into a preamp for several thousend Euros and he sits in his shop like a fat worm grub doing nothing??
It is your room, your diy speakers and your ears. What you listen to is different from what others listen with the XA60.8, so it is very hard to recommend equipment.
Hi all. Thanks for the advice. I asked mr. Pass what he is thinking about this.
My dealer says that maybe my ALeph P i causing this. So they manage audition at my home with XP-10 if i like this i then can to another with XP-20 or even XP-30.
I was yesterday listening only at good recordings and swapped the power cords to originals ones that Pass provided with.
My opinion from yesterday was that the amp is revealing much more than all my previous experience with AMPs. Maybe this is why I had some complains. The amp is maybe sound more revealing the sound and the bad recordings are just no more fun with it.
Do not get me wrong. I like very much the crisp nuances that the new Amp I reveling. Just hoop it will be later on more musical. Maybe ( like 60.5 vs 100.5 ) the 100.8 is better for me ? Have someone the knowledge of it ?
My dealer says that maybe my ALeph P i causing this. So they manage audition at my home with XP-10 if i like this i then can to another with XP-20 or even XP-30.
I was yesterday listening only at good recordings and swapped the power cords to originals ones that Pass provided with.
My opinion from yesterday was that the amp is revealing much more than all my previous experience with AMPs. Maybe this is why I had some complains. The amp is maybe sound more revealing the sound and the bad recordings are just no more fun with it.
Do not get me wrong. I like very much the crisp nuances that the new Amp I reveling. Just hoop it will be later on more musical. Maybe ( like 60.5 vs 100.5 ) the 100.8 is better for me ? Have someone the knowledge of it ?
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Hi Generg.
I did hear the INT 30.5A in my home , and the sound was kind the same sound like my Aleph X. And I liked very much, only I wish just get more Bass and little more speed. That’s why I did buy the XA 60.8
I never had listened to bigger .5 amps.
I left now my AMP Power cord 12hrs of the wall and will continue this for several days. Maybe this will help something.
Gr.
I did hear the INT 30.5A in my home , and the sound was kind the same sound like my Aleph X. And I liked very much, only I wish just get more Bass and little more speed. That’s why I did buy the XA 60.8
I never had listened to bigger .5 amps.
I left now my AMP Power cord 12hrs of the wall and will continue this for several days. Maybe this will help something.
Gr.
I hope Nelson will answer you!
Maybe you have to mail him.
Do you have a chance to hear the CD player connected to your 30.8 directly, in the case your CD-player has an attenuator build in, or do you have a 10k pot stereo you can put between them?
This could help to isolate the problem and to get new impression.
Input impedance of the 30.8 is high enough to be driven by a 10k pot directly…. for a try.
of course only when you have time and you do not want to wait for the XP10/20/30 experience….
Maybe you have to mail him.
Do you have a chance to hear the CD player connected to your 30.8 directly, in the case your CD-player has an attenuator build in, or do you have a 10k pot stereo you can put between them?
This could help to isolate the problem and to get new impression.
Input impedance of the 30.8 is high enough to be driven by a 10k pot directly…. for a try.
of course only when you have time and you do not want to wait for the XP10/20/30 experience….
I hope Nelson will answer you!
Maybe you have to mail him.
Do you have a chance to hear the CD player connected to your 30.8 directly, in the case your CD-player has an attenuator build in, or do you have a 10k pot stereo you can put between them?
This could help to isolate the problem and to get new impression.
Input impedance of the 30.8 is high enough to be driven by a 10k pot directly…. for a try.
of course only when you have time and you do not want to wait for the XP10/20/30 experience….
I have not mail to Pass himself. But i think if he is readinge soemething on the net he will seen my post.
I do not have a 10k pot. I can wait till this weekend. But thanks for the tip !
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