It's newer! It's better! It's the new Super for 1961. Well, maybe not, but it is all-original except for the speakers. There's quite a difference between the 6G4 and the "A", preamps are different and the trem circuit has the cathode follower. I'd love to hear the difference between these two amps, especially the trem. One rather unusual thing about this amp was the power transformer, 6516, which dates back to the 5C4 Super. This is odd as the tweed 5F4 Super used the 8087 2 years or more before this was built. No bias tap and no heater centre tap. OPT is 45216, 6G4-A used 125A6A. The mix of blue and yellow caps shows a transition period and Leo never wasted anything. Someone had replaced the cathode caps but not filters, which I did. I also replaced the .05 coupling cap in the vibrato channel with .0047 because the overabundance of bass-it still has plenty. Cool amp.