My F4 Build
 

Well.....My F4 is under way.
Santa brought me matched triplets of 240/9240's all the way from Israel.
He also brought me some 74V/170V's from Hong Kong I hope they are genuine.

My question is on the trimmer pots; how do you know they are oriented properly for clockwise gain in Ω?

Also I ordered TO-92 heatsinks just for kicks; should I thermally couple the 74 & 170?

I was just thinking...
...I wonder if Einric is gonna start a build-thread for his new F4 ?
Mmmm...?

Oh well...need not wonder, any longer !

Hi Einric !

I hope you didn't get your 2SJ74's from where I did !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Cheers.

Si.

If you didn't; tell me where you did...
...I could do with some genuine-product !

Sorry Einric...
...dunno much about the F4.

You got 'V' Tosheys ?

What do they measure ?
( 9v battery... Jazz )

Stick with Spencer for your jfets.

I don't know how to measure them, neither of my multimeters have transistor test on them.
Yes they were stated as Toshiba V's.
I purchased them on E-Bay from HKaudioparts, the 74's were listed at ldss=17.07ma.
My 170's came from E-Bay from UTsource.

Could anyone suggest a good transistor matching schematic that I could build on a perfboard?

This doc might help.

@VDI
You Rock!
Thanks

I just so happen to have an LM317 on perfboard ready to go.
Would I be able to use this same setup at the working voltage for the application?
I would assume yes since there are no resistors in the circuit.

How about a 9 volt battery?