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The last 1X15" Bassman was the 1954. In fact, I had the privilege of working on one of the firs5t 4X10 Bassman amps about 10-12 years ago. It was stamped Dec. of 1954. The circuit was a 5D6...5 for the '50's, D for 1954, and 6 for the model...Bassman.
The 5F6 circuit was designed in '56(F) and produced in '57. The 5F6A, which is the circuit for the '59 came on production in 1958. These two years...'58 and '59...are considered to be one of the prime rock guitar amps.
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