Solid Solid State Power Amplifier

[Mooly]

I have been considering that before I have chosen this solution. The main reason was that this shown here gave smoother distortion residual at high frequencies. Self's type II bias gives a bit lower distortion, but more high order components. That's the main reason why I made it this way (type I by Self).

Thanks Pavel... that's interesting, I haven't the means to measure distortion like that.

 

[Federmann]

The amplifier has a high current input circuits, no local feedback, which deteriorated characteristics, that I like. The results are indeed excellent.

 

[Federmann]

I am, well describe why it is important not noise, but the gain at high frequencies. I explained why the high current input circuits. I explained why no local feedback. PMA well studied my text.

Distortion is not the smallest, but listening is better than ever, congratulations.

 

[Upupa Epops]

Federmann, PMA can use higher rail voltage at VAS and efficiency rise to theoretical limit, it is not problem. If you don't understand what I'm talking, look at schematic of MY AMPS, which you have at YOUR PAGES...

 

[PMA]

Yes, but here is a misunderstanding, this amplifier does not use MOSFET followers, so the Vgs drop does not count here. Please have a look at schematics in the 1st post of this thread. There is a plenty of voltage to feed Vgs.

 

[Federmann]

… can use higher rail voltage ….. If you don't understand what I'm talking, ...

Thank you for repeating what I've written many times on their website.

 

[Upupa Epops]

Also with bjt followers you can to use higher rail voltage at VAS, here concrete 2xVbe higher, if you can to go at full efficiency of output stage...

 

[Upupa Epops]

And no local feedback at PMA's schematic, Federmann ? Really ? 😎

 

[Federmann]

And no local feedback at PMA's schematic, Federmann ? Really ? 😎

In effect, all killing capacity, why are you asking when you read my site.

 

[Upupa Epops]

No Federmann, I see there ( at PMA's schematic ) local feedbacks - you not ?

 

[PMA]

Thank you for repeating what I've written many times on their website.

Pavel Dudek made higher VAS rails in his amplifiers 17 years ago.

 

[PMA]

Also with bjt followers you can to use higher rail voltage at VAS, here concrete 2xVbe higher, if you can to go at full efficiency of output stage...

That's right.

 

[jcx]

in power vertical mosfets there is a huge increase in crss when Vds drops to <2Vt

so "maximizing supply efficiency" by running them to within a few V of the rail costs you extra compensation - slowing the amp over its complete operating range

 

[PMA]

Yes, and it can be seen at the full scale 10kHz (or more) square. The question is if this issue is practical, as it covers only rare amplitude peaks.

 

[john curl]

I use an amp, almost exactly like this, as my principal amp in my video system. It works well for this application!

 

[tiefbassuebertr]

I use an amp, almost exactly like this, as my principal amp in my video system. It works well for this application!

for the application here or for the application in your video system?

 

[danhard]

Capacitance:
M1 - 2SJ118, Crss = 80pF, Coss = 450pF
M2 - 2SK413, Crss = 60pF, Coss = 330pF
by Vds = 10V, Vgs = 0V, nonlinear

 

[john curl]

What is the difference between HERE and my video system?

 

[tiefbassuebertr]

What is the difference between HERE and my video system?

here was describt audible effects. By your video system are only to observe visual effects - so I think.
You wrote
"It works well for this application!" Therefore my question. What means "this"

 

[john curl]

Video has both audio and video components. The audio component uses this amp type.