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17th January 2006, 05:34 PM
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#1 |
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diyAudio Member
Join Date: Sep 2002
Location: Norway
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Pass X2 Rev.1
It seems a lot of people are eyeing the Pass Labs X2 preamplifier.
I have buildt the discontinued Rev.1. I stayed with the original schematics for the most part. Some changes where needed to accomodate some of the parts from my (ever growing) junkbox. This was probably the biggest reason I undertook the project -to put some of my precious junk box parts into service again. Another reason was that I needed a reference preamp to judge my own designs against. The changes I did was to double the capacitance in the psu (along with RC filtering to be able to use my existing trafos), and some additional filtering/decoupling because of the separate boards/boxes. I found the outputrelays and voltage headroom circuit excessive for a diy unit. It is a extreme design; it runs hot as a racecar (so be warned) and nearly as dangerous with unregulated rails of +135/-45VDC! Ever since the manual ( http://www.passlabs.com/downloads/ol...ct/x2serv1.pdf ) was graciosly made available through passlabs.com I was faschinated with the design of this pre, and immediately wanted to build one. This is a extremely nice sounding preamp, thank you very much Nelson! I am very grateful for your efforts and continous contributions to the diy community, you're a true inspiration! I snapped some pictures today, sorry for the poor quality, but you get the idea 
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Mads K |
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17th January 2006, 05:54 PM
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#9 |
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diyAudio Member
Join Date: Nov 2004
Location: Bruchsal/Germany
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Hi Mad_K,
very nice building , how does it sound ? I hope some Day i can build the X2 with the Lovoltechs A German magazine compared the X2 with a tube pre They said the tube-pre was Harley Davidson , the X2 the F1 Racing-Car ! Greetings from Germany Jürgen |
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17th January 2006, 06:06 PM
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#10 |
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diyAudio Member
Join Date: Oct 2004
Location: At the sea front, just under Rotterdam
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Mads,
very elegant. Getting the units that slim is really nice, and pretty difficult i think. Mind telling how you attached the supply cable to the powersupply on the bottom of the preamp chassis Mmm, ever heard of Buell ?
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Very good work on that one 
