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Old 29th November 2009, 04:17 PM   #1
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Default Max voltage of 2SK170?

Have not worked with 2SK170 at high B+ before. For a future singlestage preamp-project I intend to use it with the DC-working point like below with B+=90-100V, Vd=35-38V, Id=8mA, P=280mW. This is quite close to the limits of 40V/10mA.

Will there be any immediate risk of frying it due to the high B+? My main concern is what will happen on "power up".
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Old 29th November 2009, 05:24 PM   #2
jcx is online now jcx  United States
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I have heard of fets being selected at the factory for over 2x their nominal V rating as a special order product

but if you're looking for for low noise you really don't want to push the Vds - look for "hot carrier" noise

maybe you could talk yourself into counting a cascode as "single" stage?
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Old 29th November 2009, 05:34 PM   #3
wahab is offline wahab  Algeria
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Vgds max 40V...
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Old 29th November 2009, 05:36 PM   #4
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Hey jcx,

Will never go two stage ie. cascode. This is intended to be a line stage so noise will not be that problematic.

It is not above its voltage rating but the question is what happens at turnon. Using a mosfet cap multiplier with a long time constant should probably sort that out.
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Old 29th November 2009, 05:37 PM   #5
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Originally Posted by wahab View Post
Vgds max 40V...
My post says so, also that I will run it at 35V......
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