What an awesome thread!
I'll add that anything VFET is high end.
What makes a VFET special is that they have the linearity of a tube with the low noise, low distortion, and stability of solid state. Basically most of the advantages and few of the drawbacks of each type, though many do enjoy the inherent distortion of tubes, which is likely akin to me singing in the shower almost never causes glass to break or my dogs to try to bury their ears.
The main reason that there weren't a lot of them and that they haven't been made since ~1980 is cost. A set of replacement VFETs was almost the same price as an entire conventional amplifier.
They also have a three dimensional sound stage that is second to none. You have to experience it to fully understand it. Pair them with the right speaker like a JBL-XPL200A or a Yamaha NS-10000 and it's mesmerizing. IMO both of those speakers belong in this thread.
If you run across any of these do not let them get away. Do make sure you have them serviced by someone who has worked on VFETS before you power them up to prevebt damaging these no longer made and magical devices. Great info at The Vintage Knob, where I purloined these photos:
http://www.thevintageknob.org/ Go to Specials, then V-Fet.
JVC JM-S7
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Sony TA-N7B
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Yamaha B-1
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Yamaha B-2
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Yamaha B-3
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