And yet, the epitome of Fender sounds, original Tremolux, uses EL 84s...
Most Peavey amps chasing the tweed market for a while (Classic 30, Classic 50) use EL84s, but sound nothing at all like Vox, or Fenders really. My Frenzel Super Deluxe uses all octal preamp tubes, yet sounds nothing like another boutique with the same pre - I suspect it's a Gestalt thing with tubes, curcuits, and 'that sound' however you define it. All components make up the end result, not just characteristics of one
All tweed Fender Tremoluxes (the first several years of production) used 6V6s, and all black panel/black tolex (along with most cream-tolex) Tremoluxes used 6L6GC output tubes.
There was one rare variant (certainly fewer than 300 made, probably closer to 200) of the 6G9 cream tolex model which did use the 6BQ5/EL84. This is one of the rarest Fender amps (probably THE rarest). They never even got around to producing a proper tube chart-- the tube chart in these amps is a blue mimeographed typewritten sheet of paper. It was made only for a brief time in 1961 (the vast majority of white/cream 6G9 Tremoluxes have 6L6s).
I've never seen one "in the wild," only in pictures.
I feel it might be a reach to call this amp the "epitome of Fender sounds", even if they sound great, just because too few exist for them to have become archetypal in that way (especially since there are SO MANY other iconic Fenders like the 5E3 Deluxe, 5F6-A Bassman, Twin Reverb, Deluxe Reverb, Princeton Reverb, etc etc). I've never actually heard one!
I've seen one in the wild, when I was working for Spitzer Music (Hayward CA) in the mid '70s. It haed a weird problem, in that it was unstable and ate output tubes after being on for maybe an hour. I never did figure out exactly what the problem was (maybe I could now, maybe not), but Matt Spitzer didn't want me to go too far into changing things in it because it was so rare and totally stock, and Matt was one of the first, maybe THE first in the Bay Area to really jump on the "vintage" thing in a big way - he prerfered to keep it unaltered in his collection. (I'm wondering now if the problem might have been that there was a tube base incompatibility between some versions of the 6BQ5/7189/EL84 and other versions which was not widely known at that time...?)
Anyway, yes, I have seen one and have kinda assumed that the stability problem that we experienced with that amp probably had something to do with it being discontinued so rapidly. It may also have something to do with the fact that you never see them in use.