HI Mark, I have not tried one but I am looking forward to see how you make out!
Here is the link to the original Nelson Pass Bride of Zen PDF article: http://www.passdiy.com/pdf/brideofzen.pdf
Cheers
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| JFET BoZ (Bride of Zen by Nelson Pass) http://diyaudioprojects.com/Forum/viewtopic.php?f=10&t=2740 |
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| Author: | mwhouston [ 22 Oct 2010, 22:00 ] |
| Post subject: | JFET BoZ (Bride of Zen by Nelson Pass) |
After building the Nelson Pass B1 buffer preamp I was looking for something just as simple but with voltage some gain. Once more from Nelson Pass comes-up this simple creation - BoZ (Bride of Zen): JFET BoZ: http://www.diyaudio.com/forums/pass-lab ... ost1226532 So I thought I may give it a try. Anyone else built one of these? Any comments? |
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| Author: | Gio [ 23 Oct 2010, 11:41 ] |
| Post subject: | BoZ (Bride of Zen by Nelson Pass) |
HI Mark, I have not tried one but I am looking forward to see how you make out! Here is the link to the original Nelson Pass Bride of Zen PDF article: http://www.passdiy.com/pdf/brideofzen.pdf Cheers |
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| Author: | mwhouston [ 23 Oct 2010, 16:30 ] |
| Post subject: | Re: BoZ (Bride of Zen by Nelson Pass) |
Gio: Zen must have married twice because it is not the one I'm building. Mine is the one on my link. |
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| Author: | KrammeAcoustics [ 23 Oct 2010, 19:42 ] |
| Post subject: | Re: JFET BoZ (Bride of Zen by Nelson Pass) |
Yep ...there are both a BoZ and a JFET BoZ, so it's easy to mix up names.  ( two different constructions ).
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| Author: | KrammeAcoustics [ 23 Oct 2010, 19:51 ] |
| Post subject: | Re: BoZ (Bride of Zen by Nelson Pass) |
The Zen list, as we know of: http://www.passdiy.com/projects.htm But, are names like CoZ Cousin of Zen, FoZ Father of Zen, DoZ Daughter of Zen used ( ? ). I would prefere names like NoZ Neighbour of Zen or MoZ Mistress of Zen. 
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| Author: | mwhouston [ 23 Oct 2010, 22:45 ] |
| Post subject: | Re: JFET BoZ (Bride of Zen by Nelson Pass) |
MoZ is looking good. In Australia a Mozzy is a mosquito. Mistress of Zens is cool then. I may just call it the Mozzy! Great if it really flys (from an audio point of view). Have all the parts. May start tonight. |
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| Author: | KrammeAcoustics [ 24 Oct 2010, 16:03 ] |
| Post subject: | Re: JFET BoZ (Bride of Zen by Nelson Pass) |
Cross my fingers  , hope your MoZzy  are capable to sting the following coupled amplifier of yours.I would also like to build this ( BoZ ) amplifier, because it's capable ( as buffers are ), to wear long signalcables. I could use this instead of, or as suplement to my Bastard 6J5GT Tube Buffer. I also got all parts except of the JFET 2SK170, instead i've got some PN4302. Anyway i guess they will work fine, if PS stays below 30 VDC. If i've understanded NP right, the IDSS of the FET will be around 5 - 10 mA. 2SK170, Drain current IDSS VDS 10 V, VGS 0 2.6 20 mA PN4302, Drain Current IDSS VDS -15V, VGS 0 0.5 5.0 mA ( Q = are max of 5 mA enough ...hmmm ). A lower constant current through the FET should be solved, by a higher value of loadresistor ( ex. 20 Ohm ), but then the amplifier maybe won't work as intended. |
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| Author: | mwhouston [ 28 Oct 2010, 06:56 ] |
| Post subject: | Re: JFET BoZ (Bride of Zen by Nelson Pass) |
BoZ cct. brd.completed. See imges below. Once again I used the Russian 0.1uf PIO, and 10uf poly (input cap and output cap respectively) (snubbed with 0.1uf ploy). All on vero-brd. spare central tracks shorted to ground to act as a gatherer. Alps blue velvet 25k pot and slim solid brass knob. PS: 1R0 to 10,000uf cap, 10R0 to second 10,000uf cap. 5% WBT silver solder used. This will go into a Hammond anodised Al case. Attachment: BoZ_IIss.jpg Attachment: BoZss.jpg
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| Author: | dtsup1 [ 28 Oct 2010, 12:19 ] |
| Post subject: | Re: JFET BoZ (Bride of Zen by Nelson Pass) |
Hi Mark, As usual, pls write a review on the sound  I think the jfet preamp designs are awesome. Natural warmth. I see that you have mixed some carbon and metal film resistors. Those Topcon caps were the same types I used in my first ever chip amp in Melbourne. Well they exploded 1 feet from my face. (from inverted polarity) Fun times...hahhaa... PS: I still have a phobia whenever wiring up a chipamp. |
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| Author: | Dan [ 28 Oct 2010, 15:25 ] |
| Post subject: | Re: JFET BoZ (Bride of Zen by Nelson Pass) |
Where are the pics Mark ? -Dan |
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