........ UGS lies in the corner......
I'm building the (H)UGS & U.P. at the moment, what are you using that you prefer
I'm building the (H)UGS & U.P. at the moment, what are you using that you prefer
..... I suppose the UGS principle is superior
, there must be heavy reasons Nelson Pass uses it.But ..... compared to UGSv3 here used in the thread, I prefer Pumpkin from ZenMod in my chain.
The schematic has more resemblance to the older X0.2 of Nelson.
But I am always interested to try the different variations of UGS that are published in the forum. I find the schematic so balanced and perfect.
For instance nearly no drift of the output voltage, no caps and so on ....
I hope to find some day an UGS variation that can sound better than pumpkin to fulfill the prophecy of the UGS schematic.
But maybe someone else in the thread has also experience with both preamps?
But I am always interested to try the different variations of UGS that are published in the forum. I find the schematic so balanced and perfect.
For instance nearly no drift of the output voltage, no caps and so on ....
I hope to find some day an UGS variation that can sound better than pumpkin to fulfill the prophecy of the UGS schematic.
Here is my UGS implementation:
UGS with 2SK3012/2SJ313
IMHO it sounds better then the version discussed in this thread. However the offset stability is poorer. Sorry, I've never build a Pumpkin.
Uwe
sooooo just gone through setting up 2 modules with the following directions:
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
Well it went too easily , having 0.01v offset that was easily removed with tweaking the 20r pot. Nothing to do with the 50r it was at 0.00 . Second module had 0.06 relative offset at first tweaking both pots set relative and absolute offset to 0.00 . Just seems to simple... must have done something wrong!>? cant be this easy... Will stick some audio through it tomorrow...
dave
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
Well it went too easily , having 0.01v offset that was easily removed with tweaking the 20r pot. Nothing to do with the 50r it was at 0.00 . Second module had 0.06 relative offset at first tweaking both pots set relative and absolute offset to 0.00 . Just seems to simple... must have done something wrong!>? cant be this easy... Will stick some audio through it tomorrow...
dave
Yes rather marvelous! all fired up and spinning some flacs ( Portico Quartet ). Its sounding good, I'm sure it will get better as it burns in. It sounds warmer in the midrange than the xbosoz I have had for a while; if not a bit muddied. I do seem to be perceiving the quiet passages in music with more stillness also ( if that makes sense to you ? )
I must say it is one of the most effortless builds Ive done .
Big thanks to Cheff for the boards. Thanks to all who've answered my dumb questions too!
Just gotta finish building the XONO and AJ-X...
Dave
RME HDSP--VDH MCD102--UGS--VDH MCD102--A5--VDH REVELATION--B&W MATRIX 801
I must say it is one of the most effortless builds Ive done .
Big thanks to Cheff for the boards. Thanks to all who've answered my dumb questions too!
Just gotta finish building the XONO and AJ-X...
Dave
RME HDSP--VDH MCD102--UGS--VDH MCD102--A5--VDH REVELATION--B&W MATRIX 801
After looking carefully at the BOM for the "complete kit", I've decided to try building the "simple" UGS preamp.
I have a question about the PS boards. I didn't see anyone discuss how to adjust the 1K pot on the PS board. The same pot is on both the simple and the "complete kit". As I've said before, I am new to audio, so this my be a foolish question, but can someone advise me on how this pot is set?
Thanks
I have a question about the PS boards. I didn't see anyone discuss how to adjust the 1K pot on the PS board. The same pot is on both the simple and the "complete kit". As I've said before, I am new to audio, so this my be a foolish question, but can someone advise me on how this pot is set?
Thanks
I'll posrt my build once I get the components. If all goes well, I may take a shot at the more complex build.
Hi NYCOne
Nice to see the boards have landed safely
1K pot on the PSU boards are used for adjusting each rail Voltage.
You usually do it using a DMM fore each chanel positive and negative.
The UGS needs to be fed with +24/-24 v.
The 1K pot is here for this fine tuning.
The BOM calls for the 470n model of Vishay cap:
VISHAY BC COMPONENTS|BFC247076104|CAPACITOR, 0.1UF, 63V | Farnell United Kingdom
I can only find the 370n model of cap:
BFC237012104 Vishay/BC Components Polyester Film Capacitors
Is there any real problem with using the 370 series instead of the 470 series?
VISHAY BC COMPONENTS|BFC247076104|CAPACITOR, 0.1UF, 63V | Farnell United Kingdom
I can only find the 370n model of cap:
BFC237012104 Vishay/BC Components Polyester Film Capacitors
Is there any real problem with using the 370 series instead of the 470 series?