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Old 16th January 2013, 06:19 PM   #21
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Default Power FETs by David Shortland - Practical Electronics November 1978 page 6

Last page - no 6!
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Old 16th January 2013, 06:50 PM   #22
Zen Mod is offline Zen Mod  Serbia
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good work RK R , as always
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Old 16th January 2013, 06:53 PM   #23
Nanook is offline Nanook  Canada
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Default suitable for the Yamaha B2 Vfet amps?

Anyone know if these could be used with the Yamaha Vfet amplifiers?
stew -"A sane man in an insane world appears insane."
Let's help Dave and Ruth
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Old 16th January 2013, 07:06 PM   #24
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Thank you ZM!
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Old 16th January 2013, 07:44 PM   #25
Telstar is offline Telstar  Italy
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btw, someone has more technical info on the 2SK82? I'm going to do full measurements on mines and I wonder what they should measure like
"The total harmonic distortion is not a measure of the degree of distastefulness to the listener and it is recommended that its use should be discontinued." D. Masa, 1938
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Old 16th January 2013, 08:38 PM   #26
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Michael Rothacher did some characterization in the L'Amp article.
There are a few data in the AES preprint no 1158 for the AES convention in Oct/Nov 1976. But this is for a PWM amplifier, so no much for linear amplifiers there.
There are a set of curves in the AES preprint, figure 7, as attached. Taken at VGS=0.
Besides that I think we know:
Vp = -42 V (pinch off voltage or VGS0)
Pd = 95 Watt
Id = 10 A
gm = 0.4 S (Siemens) (gm = transconductance) - this according to Rothacher.
2SK82 is n-channel.
2SJ28 is p-channel.
We know the case is TO-3, and the pin-out is also given in the L'Amp article.
I thought I had some input capacitance data and Ron data, but where!
Also, we do not know much about the different grades, KD-33, KE-33 etc.
BTW it was proposed to me to look at the datasheet for the 2SK60 and consider the 2SK82 to be two 2SK60 dies in parallel. (But as I understand the 2SK82 is a one-die VFET.)
Initially I wanted to make Spice models, but I have decided it is better to design by experience, so I am going the empirical way and will start out with a L'Amp to gather experience.

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Old 26th January 2014, 03:38 AM   #27
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would anyone have the LT Spice models for the 2SK82?
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