Hi Mads!
I would like to ask you to redesign your BOZ and SEWA PCB for 2SK mosfets pins. (GSD) Should I?
In your BOZ the Q101 and Q201 and in your SEWA only the Q1.
I know it is an easy modification, but I donn't want to draw into your very nice and elegant PCB artwork!
Lineup has a good idea to try in the SEWA the 2SK1058. What do you think?
If it is possible, I would like also to ask you to modify the circuit to use the 2SK1058's different Vgs(max 1.4V) Should I?
Greets:
Tyimo
I would like to ask you to redesign your BOZ and SEWA PCB for 2SK mosfets pins. (GSD) Should I?
In your BOZ the Q101 and Q201 and in your SEWA only the Q1.
I know it is an easy modification, but I donn't want to draw into your very nice and elegant PCB artwork!
Lineup has a good idea to try in the SEWA the 2SK1058. What do you think?
If it is possible, I would like also to ask you to modify the circuit to use the 2SK1058's different Vgs(max 1.4V) Should I?
Greets:
Tyimo
Hi Mads!
I am happy that you are still here!
When you will have a bit more time would it be possible to ask you to redesign your BOZ and SEWA PCB for 2SK mosfets pins. (GSD)???
In your BOZ the Q101 and Q201 and in your SEWA only the Q1.
I know it is an easy modification, but I donn't want to draw into your very nice and elegant PCB artwork!
Lineup has a good idea to try in the SEWA the 2SK1058. What do you think????
If it is possible, I would like also to ask you to modify the SEWA circuit to use the 2SK1058's different Vgs(max 1.4V)
Greets:
Tyimo
I am happy that you are still here!
When you will have a bit more time would it be possible to ask you to redesign your BOZ and SEWA PCB for 2SK mosfets pins. (GSD)???
In your BOZ the Q101 and Q201 and in your SEWA only the Q1.
I know it is an easy modification, but I donn't want to draw into your very nice and elegant PCB artwork!
Lineup has a good idea to try in the SEWA the 2SK1058. What do you think????
If it is possible, I would like also to ask you to modify the SEWA circuit to use the 2SK1058's different Vgs(max 1.4V)
Greets:
Tyimo
BOZ test
Hi!
Yesterday we did the listening test with the BOZ, Tuning BOZ and BOSOZ! We used the ZV9 and SEWA, both are realy amplifires!
The Tuning BOZ was 100% winner!!!!!
The bigest difference was between BOZ and Tuning BOZ, but it also easily outpreformed the BOSOZ!
Much more power, control, dynamic, detail, image and warm, silky sound!
I can only suggest to everybody to try!
Greets:
Tyimo
P.S.:
I got my 127mH chokes for the Choke Loaded OTA!!!!!
I hope I could soon report you about it!
BTW: How can I measure the very correct resistance of my chokes??? My multimeter is not perfect under 1 Ohm and the choke has ca. 0.54-0.7 Ohm R.
Hi!
Yesterday we did the listening test with the BOZ, Tuning BOZ and BOSOZ! We used the ZV9 and SEWA, both are realy amplifires!
The Tuning BOZ was 100% winner!!!!!
The bigest difference was between BOZ and Tuning BOZ, but it also easily outpreformed the BOSOZ!
Much more power, control, dynamic, detail, image and warm, silky sound!
I can only suggest to everybody to try!
Greets:
Tyimo
P.S.:
I got my 127mH chokes for the Choke Loaded OTA!!!!!
I hope I could soon report you about it!
BTW: How can I measure the very correct resistance of my chokes??? My multimeter is not perfect under 1 Ohm and the choke has ca. 0.54-0.7 Ohm R.
Aloha Alohka!
Thanks!
Yes! (I wrote it in post 660)
I use Mads wonderfull designed BOZ PCB.
Techs infos:
- 62Vdc RegV
- 3.46Vdc on Source
- 25Vdc on Drain
- 4.43 on Gate
Parts are non esoterics.
2x30V 50VA toroid
IRF630 in the PSU
2SK216 for Q101 and Q201!
1uF/100V Siemens Mica input cap
10uF/100V ERO MKT output cap
Yageo 1% 0.5W metalfim resistors
I donn't use pots because my Yamaha CDX993 has an output pot, but later I will try a good 10K pot on the output.
Greets:
Tyimo
Thanks!
Yes! (I wrote it in post 660)
I use Mads wonderfull designed BOZ PCB.
Techs infos:
- 62Vdc RegV
- 3.46Vdc on Source
- 25Vdc on Drain
- 4.43 on Gate
Parts are non esoterics.
2x30V 50VA toroid
IRF630 in the PSU
2SK216 for Q101 and Q201!
1uF/100V Siemens Mica input cap
10uF/100V ERO MKT output cap
Yageo 1% 0.5W metalfim resistors
I donn't use pots because my Yamaha CDX993 has an output pot, but later I will try a good 10K pot on the output.
Greets:
Tyimo
Tyimo said:Aloha Alohka!
Thanks!
Yes! (I wrote it in post 660)
I use Mads wonderfull designed BOZ PCB.
Techs infos:
- 62Vdc RegV
- 3.46Vdc on Source
- 25Vdc on Drain
- 4.43 on Gate
Parts are non esoterics.
2x30V 50VA toroid
IRF630 in the PSU
2SK216 for Q101 and Q201!
1uF/100V Siemens Mica input cap
10uF/100V ERO MKT output cap
Yageo 1% 0.5W metalfim resistors
I donn't use pots because my Yamaha CDX993 has an output pot, but later I will try a good 10K pot on the output.
Greets:
Tyimo
Hi Tyimo
Thanks for share ( also MadK ) your experiments with BOZ pre.
I got new pcb from Bas Audio to replace my old original pcb and components (caps, psu diodes, etc) and I´m sure thats a good chance to try upgrade to the TBOZ, why not
Are you repacing TIP29C in PSU to IRF630?
What Q101/Q201 bias current (V across R108) are you setting for?
Any mod on zenners stack?
Also I´m using 2x30 160 VA Avell trafo and Alps Black Beauty 10K in output. Coupling caps will be 1.0 and 4.7u Black Gate N.
In advance thanks form comments and assistance
JC
BOZ Bride Of Zen 2SK216 IRF610 Aren van Waarde
I found a BOZ project on web, that used 30 Volt at Drain.
And this was found to give better performance (symmetrical clipping).
The original, for only use of BOZ as normal preamp, with only low Volt RMS output (1-2 Vrms)
used 20 Volt at drain.
For SEWA, BOZ is used as a voltage amplifier.
The output can be maybe as high as 8-10 Volt RMS max.
Mad_K. suggested 25 Volt DC at Drain (=output) for this.
It might for some, be an improvement to use even 30 Volt DC.
It depends a bit of how high max output your SEWA would use.
Regardless if using IRF610 or 2SK216
I think 30 Volt at FET Drain could be better, at least in combination with SEWA.
lineup
=========================
More details and data about this BOZ - Bride Of Zen - using 30V at Drain
can be found at internet:
Aren's Attic - Aren van Waarde
http://home.hetnet.nl/~a.van.waarde/
Aren's Bride of Zen project
http://home.hetnet.nl/~a.van.waarde/id15.htm
The DIY-page at www.vt52.com - older article of Aren's Bride Of Zen
http://www.vt52.com/diy/diypage/diy.html
I found a BOZ project on web, that used 30 Volt at Drain.
And this was found to give better performance (symmetrical clipping).
The original, for only use of BOZ as normal preamp, with only low Volt RMS output (1-2 Vrms)
used 20 Volt at drain.
For SEWA, BOZ is used as a voltage amplifier.
The output can be maybe as high as 8-10 Volt RMS max.
Mad_K. suggested 25 Volt DC at Drain (=output) for this.
It might for some, be an improvement to use even 30 Volt DC.
It depends a bit of how high max output your SEWA would use.
Regardless if using IRF610 or 2SK216
I think 30 Volt at FET Drain could be better, at least in combination with SEWA.
lineup
=========================
More details and data about this BOZ - Bride Of Zen - using 30V at Drain
can be found at internet:
Aren's Attic - Aren van Waarde
http://home.hetnet.nl/~a.van.waarde/
Aren's Bride of Zen project
http://home.hetnet.nl/~a.van.waarde/id15.htm
The DIY-page at www.vt52.com - older article of Aren's Bride Of Zen
http://www.vt52.com/diy/diypage/diy.html
Attachments
Tyimo said:
Thanks Tyimo
I think I´m wrong and confused. My pot is 10K and Lineup post something about
http://www.diyaudio.com/forums/showthread.php?postid=1044683#post1044683
Please correct me
JC
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