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Magura 6th October 2009 07:51 PM

Semisouth JFET's: What are they good for?
As I've been trying to keep the Semisouth GB thread reasonably clean, I guess it's time to open a dedicated thread, for discussing what we can get out of those little fellas :cool: your worst :D

Magura :)

Michael Rothacher 6th October 2009 08:02 PM

A Son of Zen (or some variant) could be fun.

Magura 6th October 2009 08:10 PM

Some iteration of the F3 could also be interesting.

Could be easy, as there are boards made already, and most around here, already have the PSU part.

Magura :)

ra7 6th October 2009 09:20 PM

Can you pop these buggers directly into the circuits as they are?

Zen Mod 6th October 2009 10:20 PM


Originally Posted by ra7 (
Can you pop these buggers directly into the circuits as they are?

yup , with few minor changes in some resistor values .......

Nelson Pass 6th October 2009 10:31 PM

They are pretty much drop in replacements for vertical
Mosfets. The bias voltage and thermal characteristics would
probably support replacements of Laterals as well.


audiotux 6th October 2009 11:33 PM

a Semisouth J-Fet Dao-Headphone Amp ?

slr 5000 6th October 2009 11:53 PM

hi guys
im glad this thread has been started as i was not sure what to use mine for

what about replacing the irfp240 on a aleph 4 clone ?

is this doable and if so would i need the same amount ie 24

regards sheafer

Tea-Bag 7th October 2009 01:38 AM

Nelson's J2 circuit has elements of the Aleph-J and BA-1 from what I see.
Can't be too wrong to start somewhere around their. will ask cviller at BA-3 what's going on with those front end boards. :D

tinears02 7th October 2009 10:36 AM

stability issues ?
How prone are these Semisouth devices to oscillations compared to
say, a mosfet? MOS devices would typically need a couple of hundred ohms
right at the gate to stabilise them, are these required at these values?


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