Has anyone tried a low input capacitance MOSFET in a line stage preamp - diyAudio
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Old 27th August 2003, 10:10 AM   #1
MIKET is offline MIKET  United States
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Default Has anyone tried a low input capacitance MOSFET in a line stage preamp

How would a BS170 or SD210DE work as a line stage amp? Both devices are much lower capacitance than the IRF610 in BOZ.
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Old 27th August 2003, 06:44 PM   #2
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Myself, I occasionally use Zetex ZVN3310 and ZVP3310,
both of which are low capacitance, and they work well, but
don't have anywhere near the low noise figure of something
like the JFETs 2SK170 and 2SJ74.
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Old 27th August 2003, 08:29 PM   #3
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Default Re: Has anyone tried a low input capacitance MOSFET in a line stage preamp

Quote:
Originally posted by MIKET
How would a BS170 or SD210DE work as a line stage amp? Both devices are much lower capacitance than the IRF610 in BOZ.
We use a Calogic 3N190, which is a dual P-channel device. It has its limitations (for example it's a 40 volt device) but its Ciss is a mere 4pF.

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