All Hitachi Lateral Fet amplifier for DIY described by Paul Kemble

[wahab]

At first i did design for a single +-55V supply but Gabor did express
his preference for a separate front end PSU.

Anyway , using a single PSU is just a matter of PS connections
since in both case the 47R/220uF front end decoupling cell will
stay in place.

[gaborbela]

Originally Posted by Jay

Wahab, why don't you use easy voltage for both front and output stage? 55V for both, and I will finish building the amp within 3 days.

Jay feel free to do that, It will be good that way to.
It has a lot of advantage for the separate PS. Many designer (in high end amps) use regulated PS for the front and higher voltage.
You know better that then me!
That was my will (regulated front PS) but I'm happy these way to.
You can wind on your toroid 2X3.5m wire..
Or just use a resister to connect the front with 55V..

Greetings Gabor

[gaborbela]

Alex the Zobel N is repeated, U added twice to the circuit..
Greetings gabor

[ashok]

Originally Posted by gaborbela

.......Guys do you mind if donpetru post his creation here or keep these thread for the Hitachi laterals?.......

Donpetru's variation is an offshoot of this design. So it should stay here as it will be compared with the original circuit. I don't see any harm in his circuit being here and actually think it's better here for evaluating differences.
I don't see how the hexfet's can 'sound' any better but it would be interesting to keep the progress and results within this thread . We would want comparative listening tests . Without that all of this will just be a theoretical exercise. It does make the thread even more interesting !

[Jay]

Originally Posted by gaborbela

Jay feel free to do that, It will be good that way to. It has a lot of advantage for the separate PS. Many designer (in high end amps) use regulated PS for the front and higher voltage.

It is just curiosity. About the cascoded VAS. I don't want to design my own amp, I want to listen Wahab's amplifier and to have a proof if I'm right or wrong.

Originally Posted by ashok

I don't see how the hexfet's can 'sound' any better but it would be interesting to keep the progress and results within this thread . We would want comparative listening tests . Without that all of this will just be a theoretical exercise. It does make the thread even more interesting !

Agree about the HEXFET version here. And agree that it cannot sound any better. In simulators anyhow, they may be better (IRF240/9240, IRF632/9630).

[tinitus]

I would prefer two seperate boards
output board/stage never change, only frontend

[paul kemble]

Reference "The amplifier was designed by Paul Kemble (head of NAIM company)... ...Here is the website of Paul K. A Paul Kemble web page - Hitachi Fet designs." I would appreciate it being noted that I did not design this amplifier and have never worked for Naim although I am the author of the Angelfire and Tripod sites bearing my name.

Hope this helps.

[Salas]

In the light of your clarification the thread's title has been revised.

[Salas]

@gaborbela

You may revise first post's info using OP's 1st post edit ability based on the clarifications Mr. Kemble provided.

[TANDBERGEREN]

Originally Posted by gaborbela

Alex the Zobel N is repeated, U added twice to the circuit..
Greetings gabor

I just have to ask.

What PCB-software is this board made in?

I have usually built my electronics fully manually, but see the benefits of using a good PCB-software. I have tried the ExpressPCB software, but needs some advice of where to find the manufacturer with the best price/quality value.

Sorry for the OT here.
Double sorry, It's Alex I should have asked.