@atmasphere , you are right on the money....yes, VFET is a SIT transistor.
Tonkin (NEC), nor any other manufacturer make SIT devices today....not that I am aware of.
@teo_audio I am having a hard time fallowing your message??
Linear, yes, SIT devices are the most linear SS devices ever made, but they are no longer made anywhere.
Are you implying a new design, new build?
BTW, VFET and not V-fet is the name that Sony used in the 70s.
Besides Nelson Pass designs, Digital Do-main https://www.techradar.com/reviews/audio-visual/hi-fi-and-audio/amplifiers/digital-do-main-b-1a-646182/review
is the last to deliver a real Vfet amp, but it is not all SIT. Just as the original Yamaha B-1, it uses small signal SIT devices but IIRC, the input section is handled by J-Fets.
IMHO, the most sensible approach is to use a fully restored and enhanced Yamaha B-1, B-2 or another powerful choice from Sony.
For preamp the choices are limited to Yamaha C-1 as this was the only Vfet preamp ever build, and even the C-1 uses some J-fets in the signal path..Yes, the C-1 is very "busy" but the tone section can be defeated and the line stage is stunning. The tone controll section in the C-1 is also handled mostly by SIT devices and it becomes useful if the listening room is not ideal.
The entire signal path between the Yamaha C-1 and B-1 is all Fet, with the majority of the signal being handled by Vfet/SIT devices.
Both the amp and preamp are 40 years old by now and need proper rehab....NO, a simple recap would not do...and YES, once restored, they sound sublime....as they should since they make use the most linear transistor type ever made.
