X-Series vs. Aleph

[Nelson Pass]

As we do with the X600 and X1000, you can apply the
SS feedback loop around the front end only leaving the
output stage out of the loop. Works great with a large
output stage with a lot of bias, say 500-600 watts at
idle.

 

[AudioFreak]

As we do with the X600 and X1000, you can apply the
SS feedback loop around the front end only leaving the
output stage out of the loop. Works great with a large
output stage with a lot of bias, say 500-600 watts at
idle.

Thanks Nelson thats what i'll be doing i think.

 

[promitheus]

Clamor, clamor...

Wish I could go to the CES and not just read about it in a mag.

 

[cyclotronguy]

Nelson, I hear, appears daily in Foresthill; conspicious at CES by his absence.

The new XA200 from Pass looks stunning. Pass also was showing a really cool crossover.

Cyclotronguy

 

[Nelson Pass]

The Great and Powerful Pass does not consider requests
for personal appearances.

Pay no attention to that man behind the curtain!

 

[GRollins]

Sounds as though the Tin Man got stuck minding the suite whilst Oz was elsewhere...

Grey

 

[mefinnis]

There seems to be a lot of clamoring .......

Hi Grey,

I too would be interested in this concept(XA). Would be an interesting comparison to my Aleph4.

I have plenty of free webspace, would be happy to draw & post the PCBs, construction details, circuits etc.

Might be nice to have two versions for the A4/5 supply rails ????

You have my e-mail address

cheers ..... mark

 

[GRollins]

Mark, everyone else,
Now that I've got the Mini-A, Version 1.0 out of my system (so to speak), I will begin translating the Aleph-X schematic into an actual circuit. I have been warned by Nelson that there is a bit of a pothole in the road ahead of me, and I think I have a solution in mind (and a backup plan should that one not work, and a backup for the backup). I haven't been posting because I'd like to present a functional circuit rather than a think piece.
When I originally promised Nelson that I wouldn't release the schematic, I had it in mind that I'd give his amp plenty of leeway, perhaps six months or a year. Imagine my surprise when he mentioned the schematic a week or two ago.
...And me with a concept amp that hasn't been debugged yet. Guess I've got my work cut out for me. My reputation (no jeers from the peanut gallery) is on the line.
I shall return.

Grey

 

[AudioFreak]

Grey I'm also busily making an XA circuit... did Nelson happen to mention what the potholes would be? .... send me an email if you like ... i assume you've still got the address...

 

[Nelson Pass]

The particular pothole would be the absolute
(not differential) DC offset of the output.

 

[kiwi_abroad]

Grey,

How goes the XA circuit? I'd like to ask if you'd post an interim (or 'think piece') circuit so others could have a look and start thinking about it, and the problems involved.

I'm confused by even the basic toplogy, the X-front end, from the patents and Petters work, has all the voltage gain necessary, but the Aleph output stage also has voltage gain (and must be included in the NFB loop to control it). Obviously I'm thinking about it wrong, so a circuit would be greatly appreciated.


Thanks, Adrian

PS clamour, clamour..