I have problem to obtain all irfp240 so I think if is possible put another type in the current source (i.e. irfp250). I have read on others threads that problem is input capacitance. This affect current source on Aleph?
The 250's behave a lot like two 240's in parallel. They
work, and experience says that the bottom end improves,
but the top end gets a little darker. Not necessarily
objectionable. In my opinion it improves an Aleph 3 slightly,
does not work well in a 1.2.