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29th November 2009, 04:17 PM
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#1 |
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diyAudio Member
Join Date: May 2007
Location: Eskilstuna, Sweden
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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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Brgds Lars |
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29th November 2009, 05:24 PM
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#2 |
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diyAudio Member
Join Date: Feb 2003
Location: ..
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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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29th November 2009, 05:36 PM
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#4 |
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diyAudio Member
Join Date: May 2007
Location: Eskilstuna, Sweden
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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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