JG I am well aware of all that in fact the Gate capacitance of the IRFz24 is about double that of the IRF 510 BUT? in general these will be going in a bolt on amp that has about 4-5 Wats pushed up the Wazoo. so you and afford a? bit of loss to gate capacitance at least up to and including 15 Mhz.??
In situations where you want real control over Cin and reproducible characteristics you go for the 6 dollar a piece Mitsubshi? RF qualified Mosfets . Basically on cost there are not many other options. At that price you get source = Ground tab and a device that runs much much cooler as a result .
Where the Z24 shines is? 1. It is not often counterfeited.? and 2. Thermally it is a lot better if you look at? the data sheets. So if you have a pair of each in the same amp both running 30W out with marginal heat sinking then the IRF510s will expire a lot earlier as? they might be running 25 C hotter than the IRFz24s for the same Po.
My tuppence worth.? TEF?
