F6 Illustrated Build Guide

dunno bro, had 2 hrs of sleep tonight, woke up early and was on road for next 8hrs

now I'm eager only to get something in my belly and to catch some zzz

so, being fuzzy and upside down, not really ready for mental 'rhytmetic

no one would be happier that I can get 2SJ2145 from 2SK2145, but somehow I'm suspicious, before doing my own tests

or reading some Gargantuan Character laying down testing results

not suspicious per se, just avoiding to be overly optimistic
 
I tested the 2SK170/2SJ74 conform the print not the modern lousy fake news meter. . . 😎
Great!
 

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No, an N-Fet will never behave as a P-Fet, so complementary N-P is impossible with two devices, even if S and D are interchangeable in some J-FET devices.
See also J111 / J112 / J113 N-Channel jFET. "Features - Source & Drain are interchangeable." It is the die that is symmetric. But no, you don't change it's behaviour.
That was not my original question of pins outlay versus tester output; otherwise we would have a way to make gold sort of.