F5 power amplifier

[gaborbela]

Hello Juma and Thanh

I made a lot of search on the net I find very popular well design amps similar way cascode how Juma drawn .These amp has a good reputation .
So I will go after His schematic to make my PC board .
Also I found circuit uses the same set up how Thanh made his firs test the difference they use JET for cascode not lateral
Probably both work .
Because I know these amplifier is a commercial (not cheap) amp and has similar cascode how Juma drawn I go with that .
The difference the designer use Zener diode wich goes to the ground .
Thank you guys for the help .
Greets

[gaborbela]

Here is a working sample !

[bobodioulasso]

2A & DIY

[gaborbela]

Originally Posted by bobodioulasso

2A & DIY

Hello
Yes you right , actually these is the Grand Mos schematic .I didn't wanted to post the whole schematic because that a commercial amp.
We just talking here about cascoding the right way .
Any comment , advise welcome .
Thank one more time Juma & Thanh , you guys are very helpful.
Greets

[Melon Head]

Thanks Juma

[Zen Mod]

boyz - Papa said more than once that referencing cascode to gnd ( not source ) is part of linearizing jfet further ;

read sweet spot article ;

[Melon Head]

Thanks Zen Modster

[Nelson Pass]

Originally Posted by Zen Mod

boyz - Papa said more than once that referencing cascode to gnd ( not source ) is part of linearizing jfet further

There is a trick worth knowing - You can use a potiometer
to reference to any point between Source pin and Ground,
tweaking for the sweet spot.

[Melon Head]

What a great idea.
It is so simple, I never would have thought of it.

[Zen Mod]

Originally Posted by Nelson Pass

There is a trick worth knowing - You can use a potiometer
to reference to any point between Source pin and Ground,
tweaking for the sweet spot.

baaad Papa !

baaad !