Here the schematic diagram of Fender Bassman 5F6-A tube amplifier. This circuit is a tube powered amplifier which is used as a bass guitar amplifier.
Fender Bassman was a bass amplifier introduced by Fender in 1952. Although it was originally designed for bass guitars, it is often used for normal electric guitar in rock and roll, blues and country music.
Fender Bassman history from WikiPedia:
The Bassman was designed for the first mass-production electric bass, the Fender Precision Bass. It was introduced in 1952 and discontinued in 1983. Up to until 1954, the Bassman amplifiers had only 1 speaker (circuit 5B6), but it was the four 10″ speaker combination that came to be one of the greatest and most sought after amplifiers in history. The original series of 4×10 Bassman amps included the 5D6 (1955), 5E6 (1955), 5E6-A (1955-1957), 5F6 (1957) and 5F6-A (1958-1960) circuits.
In 1990 Fender began producing a reissue of the 1959 Bassman model 5F6-A, known as the ’59 Bassman. The newest version of this reissue is the ’59 Bassman LTD. The LTD version has a lacquered tweed covering and 4×10 inch Jensen speakers instead of the Eminence speakers used in the earlier ’59 Bassman reissue series.
Download Fender Bassman 5F6-A tube amplifier circuit diagram in PDF document: