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Old 21st November 2019, 05:16 AM   #21
denny9167 is offline denny9167  United States
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I ran through B2 Spice as well, specs look nice for the 2SK170 JFET.

THD is 0.002% for a 5mV Input, output is 27mV p-p

Output noise at 20K measured 70nV/sq.rt.Hz.
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Old 21st November 2019, 02:29 PM   #22
cygnus x1 is offline cygnus x1  United States
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Just so I understand, 4 matched 2SK170BL for the difamp and one for the CCS?

Maybe I should invest and learn LT SPICE/ B2 SPICE. Where can I get a copy?
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Old 21st November 2019, 04:00 PM   #23
baudouin0 is offline baudouin0
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Quote:
Originally Posted by cygnus x1 View Post
Just so I understand, 4 matched 2SK170BL for the difamp and one for the CCS?

Maybe I should invest and learn LT SPICE/ B2 SPICE. Where can I get a copy?
The CCS is a mosfet not jfet - so you will something else for that. LT spice is free and free to download. You will need a spice model for 2SK170 - diy audio!
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Old 21st November 2019, 06:00 PM   #24
denny9167 is offline denny9167  United States
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Quote:
Originally Posted by cygnus x1 View Post
Just so I understand, 4 matched 2SK170BL for the difamp and one for the CCS?

Maybe I should invest and learn LT SPICE/ B2 SPICE. Where can I get a copy?
LTSpice is a free download, but you will have to acquire Most tube models, and a majority of discrete SS components yourself.

B2 Spice is a John Broskie product, that was put together several years ago, I got in on the ground floor, before the price was marked up. It will run close to $600.00, but it is loaded 1000’s of components, including ALL the popular tubes, OPT’s are another story, I haven’t been able to get any OPT model to work properly. I’ve asked for technical help but didn’t get very far.
But so far as accuracy, it’s been at least 90%. Which saves a lot of breadboarding, I’ve designed phono stages that have been better than 95% accurate with B2 Spice.
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Old 21st November 2019, 08:20 PM   #25
baudouin0 is offline baudouin0
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The DN2530 MOSFET for 1039 is the best match. The DN2540 is a little low on current.


Screenshot from 2019-11-21 20-16-59.png

Last edited by baudouin0; 21st November 2019 at 08:26 PM.
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Old 22nd November 2019, 01:49 PM   #26
cygnus x1 is offline cygnus x1  United States
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I really need to express my gratitude for all the help from everyone...you guys are awesome!

I downloaded LT Spice. Is there a "spice for dummy's"?
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