There is some magical thinking with regard to RD15hhf parts.
RTFM, in this case, the data sheet.
First its a 16V max part.
Its dissipation is to low for a pair to sustain more than 20W.
Its layout is different than IRF510.
Will it work... once your past the mechanical issues, and limit
power out to maybe 20W and deal with the fact that for all
that effort you gain little.
When it comes to that if you limit the IRF510 to 16V or less you get
the same power reduction and its also about as SWR tolerant as
the RD16HHF.
Allison
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