There are several in the SX-80s models. The one you mention is awesome, I bet. But I picked this one up with a pair of Pioneer HP-100 speakers for a good price. Very happy given my vintage fetish.
Some times dreams do come true!!! I just found and then bought a pristine condition Yamaha Natural Sound B-2 VFET amplifier. I'm floored by the VFET goodness. And it hasn't even been looked at by my tech yet. So 2 VFET amp models in my collection now, 8 or 10 others to keep looking for.