AMZ FET Muff anyone built this?

[soggybag]

I found a drawing I made for a layout for the FET Muff the other and thought I might build this. I did a search on the forum and couldn't find any build reports? Has anyone built it?


-copyrighted schematic removed at the author's reqest-
The FET Muff is available on the AMZ-CD: http://www.muzique.com/amz-cd.htm


This shows 2n5457, would J201s work as a sub?
There is a 3uf NP cap between the diode detween G and Don the second and third Qs. This seems pretty large, is this essential or do you anything might work here?

[markm]

The J201's would give you alot more gain.

[Gilles C]

I tried different FETs in this circuit, and some sounded better than others. I had to use more than 10K with some FETs and I think (not sure I remember well, it was many years ago) the J201 was one on them.

The 2SK117 was good.

It is a fat sounding circuit with a lot of drive...

And I never used the diodes because I didn't have any NP at that time. Can't say about the caps.

Gilles

[soggybag]

I something I just notice about the FET Muff is that the G of the FETs doesn't seem to be biased at 1/2V+ as it is in most FET ciruits? Am I missign something or is this working on a different principal?

[petemoore]

G of the FETs doesn't seem to be biased at 1/2V+
  The gate should be close to ground, source above gate.
  It's the Jfet drain  that is commonly @ 1/2V bias.

[Gilles C]

http://ourworld.compuserve.com/homepages/G_knott/elect247.htm