Zv9 as preamp?

Onvinyl · 20th July 2006, 12:02 PM

Hi,
Even though it seems I won't find time to try:

Shouldn't the Zen v. 9 make a nice preamp when substituting the power-fet with a famous 2sk170 and readjusting the currents & voltages?

Signalwise, it would be a purist SE-approach, and even the output-cap wouldn't hurt that much since it's inside the fb-loop.

The potential issue I can see is limited output current/highish output impedance.

I might have been tried by someone, cause it seems so obvious, doesn't it?
Rüidger

Nelson Pass · 20th July 2006, 06:34 PM

Interestingly, I have played with this, and I found that cascoded
JFETs in a diff pair arrangement somewhat like the BOSOZ was
superior to a single JFET sonically, much as BOSOZ was better
liked than the BOZ.

steenoe · 20th July 2006, 06:44 PM

Quote:

Interestingly, I have played with this, and I found that cascoded

The quote thing wont let me quote the whole thing

This is pretty interesting, any chance to see a new Zen preamp with J-fets?? I would love to build a thing like that

Steen

Nelson Pass · 20th July 2006, 07:03 PM

I think we could do that.

Zen Mod · 20th July 2006, 07:10 PM

Quote:

Originally posted by Nelson Pass
I think we could do that.

why I'm not surprised?

steenoe · 20th July 2006, 07:16 PM

Quote:

I think we could do that.

Wow, thats great. Cant wait to see it

Thanks a lot for responding

A new chapter in the Zen preamp history, who would have thought that? I was afraid that the statement "this pretty much finishes the preamp offerings in the Zen series" was gonna hold!!
Thanks a lot for reconsidering!

Steen

(quite happy

)

Zen Mod · 20th July 2006, 07:32 PM

Quote:

Originally posted by steenoe
Wow, thats great. Cant wait to see it Thanks a lot for responding
A new chapter in the Zen preamp history, who would have thought that? I was afraid that the statement "this pretty much finishes the preamp offerings in the Zen series" was gonna hold!!
Thanks a lot for reconsidering!

Steen (quite happy )

I don't wanna be rude-but why not susy then?

susy or blowtorch or whatever-they seems all are along the pretty similar line (except susy approach

)

just for illustration-thinking of little ZM about these ideas......nothing new under the sun.....from other deviant thread

http://www.diyaudio.com/forums/attac...amp=1151491647

btw-I like boundaries and tasks stated from Papa....
he sometimes show almost psychotic urge to please the children

steenoe · 20th July 2006, 07:39 PM

Quote:

I don't wanna be rude-but why not susy then?

Choky, a little of your own medicine

Anyone said it wouldnt be a susy?? Anyone said anything at all?? I am sure that Mr. Pass wont let us down. If we really gets a successor to the BoZ or BosoZ, I am sure it will be better than those

Steen

(confident

)

Zen Mod · 20th July 2006, 07:45 PM

I like twisted confirmations from Papa,sometimes even more twisted than I understand,but why he must do everything?
I mean -he does it already ....?

steenoe · 20th July 2006, 08:04 PM

Quote:

I like twisted confirmations from Papa,sometimes even more twisted than I understand,but why he must do everything?

Hey thats easy to understand

This is the Pass forum!! Loads of us guys around here knows Mr. Pass from the past!! Personally I know his amps way back from the late 70'es

Allways, allways was Mr. Pass's amp's superior! I have listened to loads of amp's, but the best are Pass's amps! I heard the Treshold A400 and 4000's and they were the greatest at their time!
Mr. Pass is "God" on this forum

Just in case you missed it

Steen

20th July 2006, 12:02 PM	#1
Onvinyl diyAudio Member Join Date: Aug 2002 Location: Germany	Zv9 as preamp? Hi, Even though it seems I won't find time to try: Shouldn't the Zen v. 9 make a nice preamp when substituting the power-fet with a famous 2sk170 and readjusting the currents & voltages? Signalwise, it would be a purist SE-approach, and even the output-cap wouldn't hurt that much since it's inside the fb-loop. The potential issue I can see is limited output current/highish output impedance. I might have been tried by someone, cause it seems so obvious, doesn't it? Rüidger __________________ "I can feel what's going on inside a piece of electronic equipment. I have a sense that I know what's going on inside the transistors." Robert Moog

20th July 2006, 07:45 PM	#9
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	I like twisted confirmations from Papa,sometimes even more twisted than I understand,but why he must do everything? I mean -he does it already ....? __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

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20th July 2006, 06:34 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	Interestingly, I have played with this, and I found that cascoded JFETs in a diff pair arrangement somewhat like the BOSOZ was superior to a single JFET sonically, much as BOSOZ was better liked than the BOZ.

20th July 2006, 07:03 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	I think we could do that.

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