SIT power jfet

yero · 9th April 2012, 05:50 PM

Could a thread be started for the semisouth sjep120r100a which is now available at Newark. Can this power jfet be implemented in Mr. Rothacher latest design as a direct subsitute?

qusp · 9th April 2012, 05:51 PM

I dont think it really warrants another thread, yes it can be swapped in; they are practically identical

Zen Mod · 9th April 2012, 05:54 PM

E means enhanced

you need SJDP for direct implementation in MR's schm

but , E is doable easy , too - just look at Papa's Arch Nemesis article ........ or maybe is biasing of it already covered in MR's thread

qusp · 9th April 2012, 06:04 PM

doh, sorry I completely missed the E as I hadnt seen this (new?) part. i just read as the A in R100A being the heart of the question

thanks for the catch ZM

generg · 9th April 2012, 06:08 PM

Quote:

Originally Posted by yero

Could a thread be started for the semisouth sjep120r100a which is now available at Newark. Can this power jfet be implemented in Mr. Rothacher latest design as a direct subsitute?

The SIT 2SK82 from acronman Singapore and the SS depletion have a similar price....

Why not take the SIT......and get triode characteristic!

vdi_nenna · 9th April 2012, 06:30 PM

2SK82 from acronman Singapore delivered in 10 days to US east coast.

yero · 9th April 2012, 06:35 PM

I thought the SS sjep120r100a was the j fet that provides triode characteristics? Could you please eleborate on this subject. Yero

generg · 9th April 2012, 07:14 PM

When you want to take Semisouth you must look what Zen Mod wrote
....
You must take the depletion mode type R85 (?)?...

instead of original SIT 2SK82.

As far as I understand the SJDPR85 is at lower currents triodish and the 2SK82 really behaves like triode.

Only disadvantage less power handling and TO-3 case, means a bit difficult for our flat big heatsinks we are used to....

qusp · 9th April 2012, 09:35 PM

nope, the R100 has been covered in the circlotron article, Michael actually did a revision for the all jfet version and it does actually use the E version

qusp · 09:39 PM

ahh its huge!! its covering the edit button too so I can delete and resize. I just linked directly to his DIYA blog

now it behaves, after i've reported my own post. oh well its still not really suitable. sorry guys when I came back I could see the edit button again

9th April 2012, 05:50 PM	#1
yero diyAudio Member Join Date: Mar 2010 Location: Medina, N.Y. near Rochester N.Y.	SIT power jfet Could a thread be started for the semisouth sjep120r100a which is now available at Newark. Can this power jfet be implemented in Mr. Rothacher latest design as a direct subsitute?

9th April 2012, 05:54 PM	#3
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	E means enhanced you need SJDP for direct implementation in MR's schm but , E is doable easy , too - just look at Papa's Arch Nemesis article ........ or maybe is biasing of it already covered in MR's thread __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

9th April 2012, 06:30 PM	#6
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA Blog Entries: 1	2SK82 from acronman Singapore delivered in 10 days to US east coast. __________________ I build, therefore I am.

9th April 2012, 06:35 PM	#7
yero diyAudio Member Join Date: Mar 2010 Location: Medina, N.Y. near Rochester N.Y.	SIT I thought the SS sjep120r100a was the j fet that provides triode characteristics? Could you please eleborate on this subject. Yero

9th April 2012, 07:14 PM	#8
generg diyAudio Member Join Date: Jul 2009 Location: Near Frankfurt	When you want to take Semisouth you must look what Zen Mod wrote .... You must take the depletion mode type R85 (?)?... instead of original SIT 2SK82. As far as I understand the SJDPR85 is at lower currents triodish and the 2SK82 really behaves like triode. Only disadvantage less power handling and TO-3 case, means a bit difficult for our flat big heatsinks we are used to.... __________________ and the First Wtt is......a really First Class PSS Idea !


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9th April 2012, 05:51 PM	#2
qusp is choosing a less facetious title... diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	I dont think it really warrants another thread, yes it can be swapped in; they are practically identical

9th April 2012, 06:04 PM	#4
qusp is choosing a less facetious title... diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	doh, sorry I completely missed the E as I hadnt seen this (new?) part. i just read as the A in R100A being the heart of the question thanks for the catch ZM

9th April 2012, 09:37 PM	#10
qusp is choosing a less facetious title... diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	ahh its huge!! its covering the edit button too so I can delete and resize. I just linked directly to his DIYA blog now it behaves, after i've reported my own post. oh well its still not really suitable. sorry guys when I came back I could see the edit button again Last edited by qusp; 9th April 2012 at 09:39 PM.

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