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Old 1st August 2012, 08:02 PM   #1
dippyman is offline dippyman  United Kingdom
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Default pass jfet pre amp

hi all. I ordered a pcb from a very oriental man...for a boz build,thinking that it was for the irf mosfets....but what I got was for 2sk170 jfets. I've been in the internet,but i'm not able to find a diagram for this,nor for the psu.so can any of you clever folks help me?..very simple elegant design it seems, only the jfet and 6 resistors....but with out a diagram,I'm stuck. Cheers
Dave in dorset.xx
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Old 1st August 2012, 08:21 PM   #2
vdi_nenna is online now vdi_nenna  United States
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search for boz-j
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Old 1st August 2012, 08:24 PM   #3
AudioSan is offline AudioSan  Norway
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this one?
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File Type: pdf jfet boz small.pdf (25.8 KB, 481 views)
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Old 1st August 2012, 08:25 PM   #4
jean-paul is offline jean-paul  Netherlands
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- picture ?
- website where you bought it ?

Needle, haystack you know what I mean.
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Old 1st August 2012, 08:29 PM   #5
vdi_nenna is online now vdi_nenna  United States
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The voltage should be 16v and the 10 ohm should be 22 ohm, but double check.
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Old 2nd August 2012, 09:14 PM   #6
dippyman is offline dippyman  United Kingdom
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Default pass 2sk170

thanks guys for the info,at least I now know the resistor value's....I can start building....what a site,and the depth of knowledge.
Dave in dorset, cheers Guys.xx
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Old 5th August 2012, 03:59 AM   #7
RobertHaze is offline RobertHaze  United States
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The pcb may be for the Pass B1 line stage. There are red Chinese pcbs for sale on Ebay.
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Old 5th August 2012, 06:20 PM   #8
dippyman is offline dippyman  United Kingdom
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thanks to robert for the info that my board could be the B1 line stage. don't think so, as my board use's 2sk170's,and the B1 use's IRF mosfets. Mind you,my own fault,cos that's what I was expecting.....silly me!!

dave in dorset.
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Old 5th August 2012, 07:21 PM   #9
ramallo is offline ramallo  Europe
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pass  jfet pre  amp
Quote:
Originally Posted by dippyman View Post
thanks to robert for the info that my board could be the B1 line stage. don't think so, as my board use's 2sk170's,and the B1 use's IRF mosfets. Mind you,my own fault,cos that's what I was expecting.....silly me!!

dave in dorset.
Probably you find this thread very interesting Jfet BOZ
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Old 5th August 2012, 07:32 PM   #10
dippyman is offline dippyman  United Kingdom
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ah ha....been doing some research on BOZ....it seems that Mr Zen got married twice....as there's a version using IRF mosfet's,and another ,(Which is the board I have) .which use's 2sk170's...you might have known this,but I did'nt...as I'm retired with time on my hands,I'm going to build it first using ordinary standard components, and then use audio phile one's,just to see how much better the second version sounds....Dorset Dave.xx
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