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Old 17th February 2013, 02:34 PM   #1121
Manu is offline Manu  Europe
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Quote:
Originally Posted by samoloko View Post
I use sk170 and sj74
I would like to know If going high than 6 mA In Idss would bring Improvement In sound
You need at least 7 mA (2x 3,5mA) (6mA should work though). Running the JFets at Idss is plenty. It wont hurt if you take some with higher Idss, but I dont think that you can expect any improvement ...
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Last edited by Manu; 17th February 2013 at 02:45 PM.
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Old 18th February 2013, 06:40 AM   #1122
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based on schematic posted here UGS adventures which resistors are most critical to sound quality and got to be of high quality
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Old 18th February 2013, 02:30 PM   #1123
Maousse is offline Maousse  France
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I like to use DALE RN55 everywhere, including the commuted ladder attenuator.
So I didn't questionned myself about that.

It seems that you are not satisfied with the resulting sound.

You may be have some other problem that have to be solved first.
Using standard metal film resistors, the sound was already astounding (compared to live sound of classic music), so I permit myself to ask.

Can you post some pictures of your preamp version please (in particuliar the Cheff's UGS modules) ?
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Old 18th February 2013, 05:21 PM   #1124
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Salut Doc

Ca boume?

Manu
(MFC)
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Old 18th February 2013, 07:44 PM   #1125
Maousse is offline Maousse  France
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Old 18th February 2013, 07:50 PM   #1126
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thank you for your replys
I use 20 K pot In front of unbalanced UGS V3 - thats It
values are R In 14 K R FB 56 K load resistors 1 K
regards
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Old 18th February 2013, 10:45 PM   #1127
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From what I remember, 10K pot has been used in unbalanced UGS, at the output.
Check this information, I'm not quite sure...

RIn : 15K - RFb : 56K
Hope this helps
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Old 19th April 2013, 02:02 PM   #1128
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Can i use ztx451/551 to replace the ztx450/550?
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Old 22nd June 2013, 08:23 AM   #1129
Maousse is offline Maousse  France
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Quote:
Originally Posted by ivan2000 View Post
Can i use ztx451/551 to replace the ztx450/550?
Hi Ivan,

Yes, why not ? higher voltage (no use) and half the current tranfer (still OK)
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Old 2nd July 2013, 11:48 AM   #1130
lovemov is offline lovemov  United States
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In Pass Labs X350.5 amp, there are 2 "UGS 5" modules, got 2 pots each channel, signed as "ABS" and "DIFF". So I guess I can adjust these 2 offsets the same way?
"(1) Short inputs to ground", I am using balanced input, does this mean I short 3 pins of XLR connector?

Thank you.


Quote:
Originally Posted by CheffDeGaar View Post
1) Short inputs to ground.
2) With a voltmeter across Vout+ and Vout-, adjust the 25R pot to read 0V (relative offset)
3) Votlmeter between Vout+ (or Vout- if you want) and ground, adjust the 50R pot to read 0V (absolute offset)
4) Let warm up for 1/2 to 1 hour
5) Recheck point 2 & 3
6) You're done

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