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Old 17th January 2006, 05:34 PM   #1
Mad_K is offline Mad_K  Norway
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Default 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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Old 17th January 2006, 05:37 PM   #2
Mad_K is offline Mad_K  Norway
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back
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Old 17th January 2006, 05:39 PM   #3
Mad_K is offline Mad_K  Norway
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inside the main box
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Old 17th January 2006, 05:40 PM   #4
Mad_K is offline Mad_K  Norway
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inside the psu
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Old 17th January 2006, 05:42 PM   #5
Mad_K is offline Mad_K  Norway
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mainboard
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Old 17th January 2006, 05:43 PM   #6
Mad_K is offline Mad_K  Norway
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psuboards
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Old 17th January 2006, 05:46 PM   #7
Mad_K is offline Mad_K  Norway
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X2 in the dark, and in good company
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Old 17th January 2006, 05:54 PM   #8
steenoe is offline steenoe  Denmark
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Wow Mads, are you done yet Very good work on that one
Seems like good company allright Very nice pics, indeed. You better put that preamp into your main system, for a while Beautyfull work

Steen
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Old 17th January 2006, 05:54 PM   #9
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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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Old 17th January 2006, 06:06 PM   #10
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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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