Haha someone got that from me. I am the one who originally put the FDA24N40F in a 4x amp back in like 2010. I only told a few people. Yes they do work. Within 5-10% of the correct power output and they are like $3 each. $1 each if you buy 1000.
I think I may even have some pictures to prove it. Let me look for them. That's been a decade ago though LOL.
The Palomar ERF9530 is what the Rocketbox website says is used. IDK for sure but Whatever they are they work quite well & have very low amperage draw. The amp pictured above has been through Hell & back for the past year & still works as well as the first time I hooked it up. The Sound Quality is much better than the bipolar two pill mrf455 amp it replaced.So just curious, but what fets is he using in the builds now? With all the ekl palomar fets gone he must be using something else?!