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Clone preamp section of JC-120
Clone preamp section of JC-120
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Old 15th September 2018, 02:10 AM   #11
PRR is offline PRR  United States
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Originally Posted by john65b View Post
I vaguely remember that the 2SK170 should not be used over 18 vdc rail...hmmm.....
Rated 40V breakdown.

Gate current WILL rise over a few Volts. In some audio circuits, that matters. In this one, it does not.

I'm not gonna offer any opinion on JFET substitution. If you know basic amplifiers, you can probably figure how to re-bias. If you have to ask, it may get frustrating.
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Old 16th September 2018, 02:30 PM   #12
Printer2 is offline Printer2  Canada
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The 2sk117 came in different IDSS classification Y: 1.2~3.0 mA, GR: 2.6~6.5 mA, BL: 6.0~14 mA
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Old 16th September 2018, 04:10 PM   #13
john65b is offline john65b  United States
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OK, so I left the three gain stages 2SK-117 GR, and put in the 2SK-170 GR in for the two buffers...

Just gotta make up the tone stack / volume pots now...
I Speak Spanish to God, Italian to Women, French to Men, and German to My Horse. Charles V
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