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how about using J111 J175 Jfets in F5
how about using J111 J175 Jfets in F5
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Old 4th October 2017, 11:25 AM   #11
2 picoDumbs is offline 2 picoDumbs  Australia
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Just get the bloody linear systems devices.
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Old 4th October 2017, 11:40 AM   #12
Zen Mod is offline Zen Mod  Serbia
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how about using J111 J175 Jfets in F5
I have approx. 500 of each - J309 and J271

even if these are on par with Toshibas (and LSK) with xconductance , I can use them instead of Toshibas only in stages where biasing is via CCS or something , without too much influence of degenerating resistance

in F5 ( and other stages where biasing is made through source impedance ) , Idss is of same importance as xconductance

F5 is soooooo optimized , that any change will result in practically completely different amplifier

doable , possible , even resulting in great amplifier ..... but task not for someone in need to ask simple questions

not mocking or disrespecting anyone , just stating the facts
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Old 4th October 2017, 12:08 PM   #13
rhythmsandy is offline rhythmsandy
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Originally Posted by Zen Mod View Post
yeah , it will

same as 6DJ8 with 15V at anode
so what are the similaritie between 6DJ8 and the J111 175 Jfets here?
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Old 4th October 2017, 12:12 PM   #14
kpsthakur is offline kpsthakur  India
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Quote:
Originally Posted by Zen Mod View Post
I have approx. 500 of each - J309 and J271

even if these are on par with Toshibas (and LSK) with xconductance , I can use them instead of Toshibas only in stages where biasing is via CCS or something , without too much influence of degenerating resistance

in F5 ( and other stages where biasing is made through source impedance ) , Idss is of same importance as xconductance

F5 is soooooo optimized , that any change will result in practically completely different amplifier

doable , possible , even resulting in great amplifier ..... but task not for someone in need to ask simple questions

not mocking or disrespecting anyone , just stating the facts


how about using J111 J175 Jfets in F5how about using J111 J175 Jfets in F5, sometimes situation could be to gift an amp to one of your family member or a friend, because you loan Speakers from them....no way I am parting with my 2SKs for a gift...want to live with guilt, but not JFETs
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Old 5th October 2017, 05:36 AM   #15
PRR is offline PRR  United States
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Originally Posted by WalterW View Post
I see it in more datasheets from JFET's: "Sourced from process 51" .....
What does that mean? What is the manufacturer trying to tell us with that information?
There are 9,876 different JFET part numbers.

There are basically about 13 JFET masks (the Silicon layout).

Some parameter adjustment is possible "in the oven" with dopant concentration and cooking time, but not a lot.

Say you make a lot of cookies. Even using the same spoon, flour, lard, oven setting, they don't all come out identical. Soft, crunchy, plump, flat. Same in JFET processing. Vto and Idss will vary over a wide range. This influences Gm. Leakage and breakdown voltage also vary a lot.

So the JFET maker runs "process 50", and then *sorts* the resulting parts. Parts with "good" parameters are sold under "good" part numbers and should fetch "good" price (in an ideal world). Lesser parts may be plenty fine for some users, if they can pay less. That's how we got so many part-numbers from a limited range of basic Processes.

Processes 50 (51?) is perhaps the most popular. Just a good all-purpose size and parameters. My book is packed away. I recall another with very small size for low-low leakage, one of huge size for low Ron, and a dual (which seems to be obsolete).
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Old 5th October 2017, 03:54 PM   #16
WalterW is offline WalterW  Netherlands
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how about using J111 J175 Jfets in F5
Thanks PRR, never knew there are only 13 JFET masks to produce them all.
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Old 5th October 2017, 04:51 PM   #17
Zen Mod is offline Zen Mod  Serbia
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how about using J111 J175 Jfets in F5
great info , tnx!!
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Old 5th October 2017, 10:55 PM   #18
wrenchone is offline wrenchone  United States
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13 masks to make them all, and in the darkness bind them...
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Old 6th October 2017, 08:19 AM   #19
dimkasta is offline dimkasta  Greece
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But they were all of them deceived. For another one was made... In the land of Japan. In the fires of mount Fuji, Sauron forged a master process...
One jfet to rule them all
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Old 6th October 2017, 08:25 AM   #20
2 picoDumbs is offline 2 picoDumbs  Australia
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Precious....
Precious....
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