I have a linear amp that gets over 40W at 6M using IRF510s.
Wasn't hard to do that.
The characteristics are not great but its not about capacitance as
a sole factor.? Then again input Z is a factor even MRF and BLF series
MOSFETs.
The problem of wideband amps with MOSFETs is input and output matching.
The gate is a capacitor and that makes input matching difficult.? Most designs
using IRF510 or IRF530 40M is a sweet spot.? The problem being input
impedance goes down with increasing frequency.
Develop voltage at the gate effectively you get power out.
--
Allison
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