Jul
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In the beginning Marshall Amps designed a number of tube amplifiers, each to be used for a different purpose: PA (Public Address), Organ, Bass and Guitar. The JTM 45 was often used with two column type speaker cabinets for PA systems. Later when the 100 watt Marshall tube amplifiers were developed, many variations of the tube amplifiers were used for particular purposes. The PA versions had an extra 12AX7 to allow for extra input channels. They also added two more output tubes (EL34) and larger output transformers. The early Marshall tube amplifiers didn't yet have a Master Volume control. For the bass amps usually the only difference was an added capacitor placed on one of the inputs that would filter out some of the high frequencies. It was the Bluesbreaker tube amplifier or Model 1962 combo amplifier which really put Marshall on the map. This amp was used by Eric Clapton in the legendary John Mayall Bluesbreakers.
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looking to sell late 60s marshall gold face