X2_ugs3,4

[thomasfw]

My first impression, it is a thunderstorm!

Do you mean it likes a "electronic instructment" in lab more than a HiFi Pre amp ?


Thomas

 

[acaudio]

Do you mean it likes a "electronic instructment" in lab more than a HiFi Pre amp ?


Thomas

Hello Thomas,
I mean a good pre. I have an Aleph P1.7 clone to compare, the new sounds different to them. It sounds "straight forward", very good dynamics, deep bass and good top end. The middle are, so my first impression better on Aleph. I listended for first Jaques Loussier Trio , Oscar Peterson and as contrast Joss Stone .
For a really comparison I need a lot of time.
I listen further...

I used for my first listening with "fly" connections a Alps pot 100k and reduced the value of feedback resistor to 100k such in X2 for lower gain (more feedback) . So I can turn on the input pot a little more. One nice side effect: much wider freq. response >200kHz (I measured my second module before listening).
The test setup was DC coupled (only Cap at output CD player- T+A CD1000AC), single ended in- and output.

Best regards

Adam

 

[acaudio]

My first impression is confirmed, it sounds good.
Probably also because DC coupled. The dynamic range is very good. It is detailed at the top end, but no nervous.
Ok, my AP1.7 is more tempered and smooth at the middle...

Maybe would someone build it too, and share his impression?
I´m curious.

Adam

 

[nar]

Will try , Adam

Great work

Regards

 

[moamps]

Anael,

If my memory doesn't fail me, you had a similar project a while back
http://www.diyaudio.com/forums/attachment.php?s=&postid=379223&stamp=1082766361 .

Have you built it yet?

Regards,
Milan

 

[nar]

It's not exactly the same thing , as this was thought for a XO design , with low gain figure , and no cascode , and bipolars .

I didn't have time to build it , but it will rather work

Regards , nar

PS also check the borsanar thread , we got an Aleph X idea , but specially used components

regards ,

nar

 

[Alain Dupont]

acaudio,

Where did you "find" your:

2SK 389 GR {I have a few in stock... but would like new ones.}
2SJ 109 GR {I Didn't find these !!!}

Thanks so much for sharing.

Regards.

Alain.

 

[acaudio]

acaudio,

Where did you "find" your:

2SK 389 GR {I have a few in stock... but would like new ones.}
2SJ 109 GR {I Didn't find these !!!}

Thanks so much for sharing.

Regards.

Alain.

Hello Alain,
I use currently "BL" types no GR.
I bought mine by www.schuro.de , but the 2SJ109BL are currently not available. You can buy those too by http://www.borbelyaudio.com/

Thanks for interesting
Adam

 

[aht]

Final question for connecting

1. How to use potentiometer for conncet with UGS 3,4 .Does it use 5K, 10K, 20K or 100K (volume in or out ?)

2. What's version completely , with power supply rails +/- ?

3.Do I use capacitor for input/output or don't use both them ?

Thanks
AHT

 

[acaudio]

Re: Final question for connecting

1. How to use potentiometer for conncet with UGS 3,4 .Does it use 5K, 10K, 20K or 100K (volume in or out ?)

2. What's version completely , with power supply rails +/- ?

3.Do I use capacitor for input/output or don't use both them ?

Thanks
AHT

Hello Aht,

if my calculation is correct the right value for pot should be 10k (service manual 10,75k). I tested it too with 100k, but if you use input cap, you should have a look at low pass effect

the supply rails are +/-33 V in the manual. 30...35V should be ok.

I would say, you can omit the caps, but in case of output stage failure....?


Regards
Adam

 

[aht]

Mr.Pass & Mr.Borbely you are master of JFET

Could anybody post originally schematic (non cascode 2sk389 & 2sj109) I'll be compare with my UGS 3,4 in this picture. (I don't have a free time to clone it)

I think all X, XA and preamp series use UGS 3,4 for in put differential, Why ?

Ps : ZTX450, ZTX550, ZVP3310, ZVN3310, 2SK389, 2SJ109 they are correct choice



Regard
AHT

 

[UltimateX86]

Anael,

If my memory doesn't fail me, you had a similar project a while back
http://www.diyaudio.com/forums/attachment.php?s=&postid=379223&stamp=1082766361 .

Have you built it yet?

Regards,
Milan

you tested it?

 

[moamps]

If you're asking me, yes I did test something almost identical back then. I remember that the design was not particularly temperature stable (differential offset). Then when I realized it was very similar to a particular IP protected design, I dropped the whole thing then and there before the Great Inquisition came aknocking at my door to investigate my unholy deeds.

Regards,
Milan

 

[Nelson Pass]

You are, of course, not referring to me.

 

[moamps]

Of course not. God forbid.

 

[UltimateX86]

thus you did not try to graft a servo?

nobody tested servo like the THS4131 ?

http://www-s.ti.com/sc/ds/ths4131.pdf (page 14)

thx

 

[moamps]

Nope. Never got that far. Ain't much of a servo fan anyways.

Regards,
Milan

 

[Nelson Pass]

Ain't much of a servo fan anyways.

Me either. Not elegant enough.

 

[Raoul]

I dropped the whole thing then and there before the Great Inquisition came aknocking at my door to investigate my unholy deeds.

You better run if you see the Passmobile roll up...

 

[macka2]

I really don't see why there is so much curiosity in the UGS modules. They are current production (and protected IP) and as surface mount technology not particularly a diy frendly project.

The X'd Bosoz has proven an admirable match to the X Aleph for the diy home constructor in imho.

macka