I have a 1965 Showman and a 1966 Showman, and I used to have a 1964 Dual Showman. RE: Tubes- Mar’ Himmerich is correct. Four 12AX7/7025s, four 6L6s. Dual Showman was made as early as 1964: Showman had an 8-ohm output transformer for a 1×15″ cabinet, Dual Showman had a 4-ohm output transformer for a 2×15″ cabinet. Fender occasionally got them wrong, as some have reported 4-ohm transformers in Showman, and vice-versa. I bought my 1965 Showman with its correct original 8-ohm transformer and its “matching” 4-ohm 2xi5″ cabinet! Due to years of being mismatched, the power tubes and sockets, grid load resistors, and speakers were pretty bad and barely functional. I had the speakers re-coned to 16 ohms (wired in parallel for a total load of 8 ohms), replaced tubes, sockets, grid load resistors and a few capacitors. That was about 18-19 years ago, and it’s still going strong!

Sitting in front of my ’65 Fender (Single) Showman, I count 2x 7025′ 1x 12AX7, 1x 12AT7 plus 4x 6L6. That’s fact.

My ’66 Showman (chassis dated 1964) has exactly four (4) preamp tubes and four (4) power tubes. The effect circuit uses only one (1) tube. The first blonde heads originally had six (6) preamp tubes to support the 3-tube effect circuit and four (4) power tubes.