#Marshall jmp 1 series#

The 100W models were built with 4 inputs & 4 channels. The 50W models featured 8 inputs & 4 channels instead of the usual 4 inputs & 2 channels. The 20 Master PA amps (introduced in 1966) were the first 19″ rack mount Marshall amps. This amp was in production from 1968 up to 1972. This is the Organ version of the 1987 amp. This amp was in production from 1967 up to 1975. (Photograph courtesy Joe Pampel of Obsolete Electronics). Mk2 Amp schematic with 3x ECC83 & 2x 6550, (Joe Piazza). Schematic with 3x ECC83 & 2x E元4, (Joe Piazza). It features a high treble channel and a normal channel. This is the Bass version of the 1987 amp. This amp was in production from 1967 up to 1981.

The 2100 is the combo version of this 1964 head. This is a two channel amp, one channel is that of a 1987 Lead amp and the other channel is that of a 1986 Bass amp, making it quite a versatile amp. This amp was in production from 1973 up to 1976. Schematic with 4x ECC83 & 2x E元4 (Marshall, 1970). It used the 1987T tremolo chassis in a 2×12″ combo cabinet. This amp was in production from 1967 up to 1972. See Jacques Marshall Bluesbreaker page for some nice pictures. It used the 1987T tremolo chassis in a 4×10″ combo cabinet. This amp was in production from 1967 up to 1973. Photograph of a beautiful red JMP 1959 from 1973. This amp was in production from 1967 up to 1981.Įarly 100W schematic (with errors) with 4x ECC83 & 4x KT66, (Marshall, 1967). Schematics of the standard 100W power amp and PSU circuit with 1x ECC83 & 4x E元4/6550, (Marshall, 1978). Schematics of the standard 50W power amp and PSU circuit with 1x ECC83 & 2x E元4/6550, (Marshall, 1978). Schematics of the standard pre amp circuits with 2x ECC83, (Marshall, 1978). The following three schematics are generic schematics for the 1987 Lead & 1959 Super Lead heads, the 1986 Bass & 1992 Super Bass heads, the 2203 & 2204 Master Volume heads and the 2103 & 2104 Master Volume combos.

#Marshall jmp 1 series#

JMP Lead Series Standard and Master Volume, 50W/100W It’s a 4 input, 2 channel amp featuring a tremolo. This amp was in production only shortly from 1972 up to 1973. Some people actually like the bright sound of the 6550s in their Marshall amps but most guitar players prefer the original sound of the E元4s. This in itself was true, but many American guitar players were wondering why their Marshall amps sounded so different from their European brothers. Instead of fitting new E元4s, Unicord decided to fit 6550s, thinking that these “heavier” tubes would last beyond the warranty period. Apparently the E元4s didn’t like to be knocked about while being shipped from Europe to the US of A. Too many Marshalls were coming back under warranty with defective output tubes. The US distributor at that time (Unicord Inc.) decided to switch to 6550 output tubes in favor of the E元4. In 1975 the Master Volumes, 2203 & 2204, were introduced. In July 1969 Marshall dropped the Plexi face plates and switched to the gold colored brushed aluminium metal face plates as we know them still today. In 1967 the JMP (Jim Marshall Products) panels were introduced.