Combined with what we saw with dating a tweed Fender Champ by the tube chart and speaker code, I’m feeling pretty good that all of the various dating methods point to early 1959 for my amp.
I wish I could say that I figured all this out on my own.
I eventually traded it in for a used blackface Showman with a 15” JBL.
That amp worked pretty well with my Rick 12-string.
The first of these amps were the K&F models, which were produced between 19.Many years later, in the ‘80s, I was back into playing and recording and looked in the want ads for a Fender tube amp. That amp turned out to be an early-production 1960 Pro-Amp.I started to investigate the world of pre-CBS Fender amplifiers.The cream-colored board is laid out entirely differently (and better) than the green board. But the old ones sound darker, while the new ones are brighter, with more emphasis on treble tones.One is not necessarily better than the other; the dark tones are nice for blues and jazz, while the new amps do brighter tones better.