F6 Amplifier

[kasey197]

Basically this:

Inverting one of the secondary windings on the transformer. Or will that result in no output?

Nice idea but if u try there will be no sound. If you want to play with SE using F6 i think is a nice idea anc quite simple, just disconnect the transformer secondary for the top fet and replace with a jumper wire. So the bottom fet drives the output, and top fet just acts as a load. Not an aleph of course so won't be much power but will be pure single ended ...... Edit: leave the unused secondary alone or can parallel for better drive to bottom fet.

 

[Antoinel]

look here mos57 was very active.....

http://www.diyaudio.com/forums/soli...ementary-v-fet-amp-best-past.html#post2172565

http://www.diyaudio.com/forums/pass-labs/154009-2sj28-vfet-se-amplifier.html#post1962321

even Nelson asks how does it sound.....

Hi mos57 and generg. What is the output impedance of the opposed drain commplementary VFet amplifiers? mos57, I and maybe others may wish to read your patents and/or their published applications.
Best regards

 

[buzzforb]

Antoinel,
Have you fired up the F6 yet?

 

[Antoinel]

Antoinel,
Have you fired up the F6 yet?

I am slow. Dabbling with SuperSymmetry.

 

[Zen Mod]

I'm having my towel handy ;

just waiting for Vogon ship , going to study Ultrasymmetry

 

[Antoinel]

I'm having my towel handy ;

just waiting for Vogon ship , going to study Ultrasymmetry

I have a proto combination balanced amp of STASIS [THRESHOLD S/150] and SuperSymmetry. I can only imagine the ultraperformance potential of a STASIS plus Ultrasymmetry!

 

[Zen Mod]

as Pa sez , that needing completely different Universe

or , maybe not , if starting from scratch

(S/150 not being scratch)

 

[buzzforb]

Low hanging fruit.

 

[Antoinel]

Low hanging fruit.

Yes. S/150, F6, Teaser F6CC, Funny^6, F7 are tools for combo studies.; to sharpen my subjective hearing.

 

[Zen Mod]

buzz

ya forgot smiley ?

 

[buzzforb]

 

[Zen Mod]

Laguna Seca tonight .......

 

[Antoinel]

Maybe F7

It is derived from the "Beast with a thousand JFets" by Mr. Pass. It has the simplicity and efficacy of his design doctrine, plus the usual front end of several FW amps.

 

[Zen Mod]

more like Pa's I/V stage

problem is how to implement rest of (power side ) circuit

 

[OllBoll]

Another thing I thought about:

If I've understood correctly the purpose of the transformer is to act as a phase splitter. If you already have a balanced source, would it be possible to skip the transformer, the feedback and just connect the inputs directly?

 

[Zen Mod]

another way to have Silencer

 

[OllBoll]

another way to have Silencer

Can't seem to escape the curse of the silencer...

Is the result the same if we invert one of the +- sides or is the transformer more than just a phase splitter in the F6?

 

[Zen Mod]

ya can see those 1KuF as shortie , for AC signal
so while you're trying to feed upper gate , lower 1K is silencing it
while you're trying to feed lower gate , upper 1K is silencing it

you have one spare winding in quadfillar ; so , having more than several ways to skin balanced cat

 

[OllBoll]

Hmm, the pursuit of knowledge continues...

Would this work or have I forgotten something this time too?

And on another note, If I've understood correctly the F6 has very much in common with the JLH / PLH except that now a transformer splts the signal. And that the "sound tuning" is about letting one side doing more or less ( or equal ) load of the other side.

If one would go pure SE and disconnect the trafo from one of the parts would it be enough to connect a jumper wire on the then ccs side? Would be fun to build one and compare against my F2.

 

[Nelson Pass]

Would this work or have I forgotten something this time too?

If you are looking to have a current source (high output impedance) amplifier,
then it would work. If I were doing that, I would say you can eliminate R2
and run the primaries in series from input to ground.