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PC Boards for v9?

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R-K Rønningstad

R-K Rønningstad

Member
Joined 2006
More power from JFET

The Lovoltech JFET device does not have a P-channel counterpart, so a N/P push-pull output stage is out of the question.
A quasi-complementary version should in theory at least, be possible with the N-channel.
To me it seems much of the idea behind the F3 and the ZV9 is to operate the JFET at a special part of its transfer curve, that is, where it resembles a triode.
My question is then, a quasi-complemantary amplifier with the JFET might "spoil" this concept, and there might be any reason for it left. Maybe even not a N/P-complementary amplifier with an imaginary P-channel JFET would give the F3 sound?
Any comments from preferably the Zen-master himself? ;-)

Regds
Rolv-Karsten
 
R

RoboMan

Member
Joined 2006
Re: More power from JFET

R-K Rønningstad said:
The Lovoltech JFET device does not have a P-channel counterpart, so a N/P push-pull output stage is out of the question.
A quasi-complementary version should in theory at least, be possible with the N-channel.
To me it seems much of the idea behind the F3 and the ZV9 is to operate the JFET at a special part of its transfer curve, that is, where it resembles a triode.
My question is then, a quasi-complemantary amplifier with the JFET might "spoil" this concept, and there might be any reason for it left. Maybe even not a N/P-complementary amplifier with an imaginary P-channel JFET would give the F3 sound?
Any comments from preferably the Zen-master himself? ;-)

Regds
Rolv-Karsten
Click to expand...

I think you are completely misunderstanding the working conditions of ZV9.

1. It is a Single-Ended output, not Push-Pull.
2. Complementary devices are not required.
3. The JFET and the output MOSFET is in cascode configuration.
4. The JFET is biased to provide a slightly concave transfer curve to compensate the convex transfer curve of the output MOSFET to reduce distortion.

May be you need to read the ZV9 documents for details.
 
D

dmtparker

Member
Joined 2010
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