The Fender Bassman used a 12AY7 as the input tube but the JTM45 was fitted with a 12AX7/ECC83 which has a higher gain. It is said that the first prototype and early production amps were fitted with two 5881 beam power tetrodes, three ECC83 tubes and a GZ34 rectifier tube, but soon KT66 tubes were used instead of the 5881 tubes. The circuit was a 1959 Fender Tweed Bassman (circuit 5F6-A) clone. It didn't actually have a model number at first, but later it was called the JTM45.
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