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Old 6th June 2007, 10:13 AM   #21
lineup is offline lineup  Sweden
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Default 2SK170GR - Spice Model

Quote:
* http://www.iu.hio.no/~knutn/eldesign/library/knut.lib

.model 2sk170GR NJF(Beta=20m Rs=4.151 Rd=4.151 Betatce=-.5 Lambda=1.923m
+ Vto=-.5024 Vtotc=-2.5m Cgd=20p M=.3805 Pb=.4746 Fc=.5
+ Cgs=25.48p Isr=84.77p Nr=2 Is=8.477p N=1 Xti=3 Alpha=10u Vk=100
+ Kf=111.3E-18 Af=1)
*Modified Beta-value from J2sk170
This is what I use to simulate my 2SK170GR preamplifier circuits.
Is this a decent model?

Are there any other 2SK170 models around .....
Me lineup, and many others, would be grateful to know these models.
As well as good useful models for
those 'other Nelson preamp devices'. Like IRF610 IRF9610

thanks lineup

--------------------------------------------------------------------------------------
From the same Norwegian knut.lib ( OrCAD )
The PNP P-JFET partner of 2SK170:
Quote:
.model 2sj74GR PJF(Beta=20m Rs=7.748 Rd=7.748 Betatce=-.5 Lambda=4.464m
+ Vto=-.5428 Vtotc=-2.5m Cgd=85.67p M=.3246 Pb=.3905 Fc=.5
+ Cgs=78.27p Isr=129.8p Nr=2 Is=12.98p N=1 Xti=3 Alpha=10u Vk=100
+ Kf=26.64E-18 Af=1)
*Modifisert Beta-verdi fra J2sj74
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Old 6th June 2007, 10:53 AM   #22
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Is the pot essential ?
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Old 6th June 2007, 11:42 AM   #23
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Default D&G reversed

I have to apologize - I have the pinout incorrect on the jfet - I thought it was GDS but it's DGS (stoopid newbie mistake )

I'll revise and repost. Sorry about this

Stephen

Edit: Actually, I have the jfet facing backward as well - reminder to self - don't get overexcited and attempt layouts late at night

Edit2: Actually, it's not that it's late at night, it's because I didn't check the datasheet first.
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Old 6th June 2007, 11:51 AM   #24
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Quote:
Originally posted by Zen Mod


Papa already promised to me one X1000 case ,complete with hsinks
( that dreky box will be probably good enough for my next phono preamp), randomly throttle filled with small/medium/big jfet/mosfet goodies ;

he sez-because weight is slightly under 100 killos ,he will pay for shipping.......there is no need that I worry about trivia like this ........



X1000 is ugly



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Old 6th June 2007, 11:58 AM   #25
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Quote:
Originally posted by mpmarino
Hi Twitchie,

I look forward to your completion and impressions. I'm sure I won't get to it for quite some time. Amongst the majority of the company on DIYA I'm a hopeless newb but I think you may want to make room on the board for 10uf film caps. I'm thinking that with so few parts - selection may be more important.

Please free to tell me I'm wrong and I'll happily crawl back into my hole
Thanks for the input mpmarino - I didn't start out thinking I was going to share this layout and did it with a pair of 10uF Blackgate N caps I have that I ordered for a P1.7 (Veteran's boards) in mind.
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Old 6th June 2007, 11:58 AM   #26
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Quote:
Originally posted by stefanobilliani
Is the pot essential ?

YES IT IS
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Old 6th June 2007, 12:07 PM   #27
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by mpmarino


X1000 is ugly




I like ugly preamps

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Old 6th June 2007, 02:14 PM   #28
Manu is offline Manu  Europe
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Quote:
Originally posted by cviller

How did you know I needed that exact circuit for my lunch-box project???
That saves me a lot of time! Thanks!
I allways wanted to see a genuine Tupper-Amp. Nice.
manuel
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Old 6th June 2007, 02:22 PM   #29
cviller is offline cviller  Denmark
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Quote:
Originally posted by Manu

I allways wanted to see a genuine Tupper-Amp. Nice.
manuel
It is actually an amp A/B tester and it works nicely except for the passive preamp feature which is not the way to go when listening to F4...

I had planned to build something based on one of papas preamps, but it was with two 2sk170s and slightly more complicated feedback....
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Old 6th June 2007, 02:51 PM   #30
Manu is offline Manu  Europe
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I'LL try this tonight.

Manuel
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