The SITs that I have conduct current from Gate to Source if you apply
more than 0.6 volts, so I have to assume we are dealing with P-N
junctions.
Pot R4-R5 adjusts M1 and J1, where pot R2 adjusts J1 only. Given the different temp specs, a swing of settings is not surprising.
How does the Vdc at the sources respond during warming up?
That was not my question. You said "high cutoff voltage". How high, in volts? What low in volts to be a low cutoff voltage?
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My measurements have the Tokin 2SK182/THF cutoff voltage much lower than the 2SK60/2SJ18/2SJ20.
Nelson's DEFiSIT design matches the Semisouth SIT Vgs to an ordinary Harris 9240 Vgs.
One man's enhancement switch is another man's depletion triode-ish JFET.
Attachments
The most striking difference being that one is extinct while the other is freely available on the open market (at DIY volumes) although, admittedly declining.
This is DIY, not commercial so as long as we can get our hands on them, the journey is part of the fun right?
I guess the other aspect to consider is - how do they actually end up sounding?
I haven't heard both so will withhold comment but other forum members have heard both and I know of at least 1 (fellow Canadian) who prefers his Tokin implementation over his Sony one.
If I could get hold of 2SK60/2SJ18 I would not hesitate.
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What is measurably different between the 2SK60 and the 2SK182 that would make a difference in an amplifier circuit? I have some of each transistor and I have access to a modern calibrated curve tracer. I will be happy to explore your assertion and post results here.
bummer .......
I don't need more than 10W
Unfortunately that is not about what you need but rather what your adoring followers want. And we know you enjoy all that adulation so, back to work!
woofertester,
transistors conceived to work as a switch feature huge interelectrode capacitances, low conduction channel resistance, low switch-off voltage, high input impedance, high doping levels, a thin dielectric layer contaminated with toxic heavy metals and inexorably exhibit high signal distortion.
The 2SK60 is one of only a few power transistors that was explicitly developed with the intention of designing an audio amplifier by employing uniquely peculiar, advanced techniques. What do you think your measurements could reveal?
transistors conceived to work as a switch feature huge interelectrode capacitances, low conduction channel resistance, low switch-off voltage, high input impedance, high doping levels, a thin dielectric layer contaminated with toxic heavy metals and inexorably exhibit high signal distortion.
The 2SK60 is one of only a few power transistors that was explicitly developed with the intention of designing an audio amplifier by employing uniquely peculiar, advanced techniques. What do you think your measurements could reveal?
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