The Pass Pub: The High-End Off Topic Thread

[Melon Head]

Have you had a chance to build anything else for comparison?
I am thinking of building up one of these but possibly using laterals.

[Gyuri]

In addition, I have built F4, ZV9 and a secret wonder-weapon.
(thanks to Generg and Papa.)
F4 does not play without proper pre-amp.
With lateral FETs now I'm not built yet.

[Melon Head]

It is time for me to start getting serious.
I don't think anyone has done an Aleph with laterals so I suppose someone has to do it.
It may as well be me.

[Gyuri]

Forgive me, you know my English is terrible and I do not understand electronics.
But something I read as if the laterals were not really the Aleph topology is chosen. Because VGS lover?

[Melon Head]

Yes of course, laterals have lower Vgs, but I don't see why you could not use them.
Just need to adjust the circuit slightly to accept them.
Still probably use IRFP240 for current source.

[Gyuri]

Originally Posted by Melon Head

Just need to adjust the circuit slightly to accept them.
.

I'm afraid it's more than my abilities.
But maybe that just do not trust myself.

[Melon Head]

I will attack it and let you know what needs to be done.
Just need to finish my speakers first.
Hopefully have the speakers finished in the next 2 weeks.

[Zen Mod]

done several times

even by Mighty ZM

but you probably know that I'm always trying another one , in same test bed ........ so I don't have it

take xconductance in account , Vgs difference is irrelevant , as long you have OLG under control

conclusion - Aleph with laterals - boiled water .......... and difference comparing to IRFP150 isn't worth any hassle

but - Jfet FE is very well worth the hassle

NB- one IRFP150 instead of 2 IRFP240

[Melon Head]

OLG should be lower with laterals
What does boiled water mean?

EDIT: Even though you have already done this I would not mind doing it myself purely to satisfy my curiosity and possibly learn something.
Besides that I have a tonne of laterals lying around.

[Zen Mod]

Originally Posted by Melon Head

OLG should be lower with laterals
What does boiled water mean?

use lowest source resistors you can (in output)

use more output pairs

squeeze as much gain you can from FE - minimal source resistors , same as paralleled jfets (as in Aleph J or Mighty ZM's Mighty Babelfish J )

boiled water - yesterdays news - reinventing the wheel