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[TinselKoala]

Well, I don't have a 2sk170 but I've certainly posted plenty of JT scope traces. And LTseung has a thread that is mostly discussion of scopetraces from his JTs.

[omdano]

Well, I don't have a 2sk170 but I've certainly posted plenty of JT scope traces. And LTseung has a thread that is mostly discussion of scopetraces from his JTs.

Yeah because .. i would love write an equation for the JT circuits inputs and outputs
to make things simpler .

[TinselKoala]

Good luck!

Actually the JT is a type of blocking oscillator and these have had equations written for them in plenty.

Here you go, calculate away to your heart's content.

http://www3.alcatel-lucent.com/bstj/vol38-1959/articles/bstj38-3-785.pdf

Here's a good overview of transistor blocking oscillator operation, but without the equations:

http://mysite.du.edu/~etuttle/electron/elect37.htm

So the JT is really a blocking oscillator with components chosen so that it will operate at low input voltages.

[omdano]

is there an easier way for winding the 100 windings ? XD

[TinselKoala]

Are you winding toroids? Yes, there is.

http://www.youtube.com/watch?v=ipfYPbNl_rc