I have used mosfet as both input and vas for quite sometime. I usually use small signal mosfets, like FQU1N or FQP1N / IRF510 from Fairfield. The FQU comes in dpak and is great for small signal applications; and FQP in TO220 and is great for hot VAS.
I have never had problems with either.
I have never had problems with either.
mzzj said:For ultimate Ft look for BFQ232A
And for PNP BFQ252A.
95v VCE rating and Ft=1.2GHZ
300mA 3watt
but beta sucs big time, around 20.
, they are since some years obsolet!
Option to High Voltage Medium (Video) and High Power Devices for Output and VAS Stage
in this case this thread could be of interest:
http://www.diyaudio.com/forums/soli...wer-devices-output-vas-stage.html#post2239333
in this case this thread could be of interest:
http://www.diyaudio.com/forums/soli...wer-devices-output-vas-stage.html#post2239333
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