Have you considered a MOSFET Yamaha MX-2000? beautiful looking and from what I'm told a beautiful sounding amp. There is also a CX-2000 preamp
I've had both the Yamaha B-1 and the B-2 and they are fantastic amps. But you're right - the only VFETS come from another amp.
Even if you can find VFETS, you have to find out WHY they went bad - the main reason VFETS usually fail is when the protection circuit fails. So then your left with trying to find a competent tech you feel comfortable with to trouble shoot and repair.