MYBEST5 Jfet CFP amplifier

[Stee]

another simple idea for natural sound

 

[Boscoe]

What makes this amp have natural sound?

 

[Bensen]

Isn't this VFB instead of CFB?

Have you heard amplifiers with this topo, in order to tell that this one is good sounding.

My next amp will very probably have a comparable topo.
See the circuit and FFT analysis.
==> FFT is done with 3V amplitude at the output

 

[magnoman]

I think he's referring to the output CFP (complementary feedback pair) transistor(s).

Thanks
-Antonio

 

[Jay]

What does it mean by "Best5"? Are there 4 other better CFP amps?

My best CFP is an SSA (Not very fast tho).

Bensen,

Can you show an FFT of your amp with 5m of simulation (.tran 5m) in Hann windowing?

 

[Bensen]

Hi Jay,


I always use the blackman, what specific information are you getting out of the Hann window?
See the attachement, again simulated with 0.1V input.


Greetz

 

[Jay]

Hi Jay,
I always use the blackman, what specific information are you getting out of the Hann window?
See the attachement, again simulated with 0.1V input.
Greetz

Simulation is just simulation. What important is subjective performance and consistency between pictured performance and real life performance. If you can not differentiate 2 amps by looking at their FFTs, then showing FFTs has no meaning, right?

I think something is wrong with your circuit (may be from insufficient drive for the mosfet VAS). And there is also masking by noise floor.

But anyway, that's just my opinion.

 

[Stee]

Yes CFP means natural sound

but also the esclusive VLL system on VAS

 

[Jay]

Is it a VAS?

 

[Stee]

sure

 

[BV]

"VLL"-VAS is loaded by NFB network..Triple outputs (undefined quiescent current, and CFP are very sensitive to exact setting...) outside NFB, so lot of high order distortion, and relatively high output impedance. Missing resistor between prediver´s bases..