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Marshall JMP

In 1967 the JMP (Jim Marshall Products) panels 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.

Make and model Marshall - JMP (All)
Power (Watt) W
Type
Channels 0
Rectifier
Effect loop No
Effects No
Reverb No
Impedance 4/8/16
Size
Weight

Marshall-JMP

In late 1967 Marshall finally retired the JTM model prefix and replaced it with JMP (for James Marshall Products), a name that would stick through 1981.

The heads produced under the JMP label from 1968 – 1972 (‘69 in particular) are considered by many to be the high water mark of vintage Marshall amps. While brushed gold metal faceplates replaced the true Plexi faceplates in mid-1969, the Plexi sound remained the same and became even brighter and louder through the early ‘70s. For those looking for vintage Marshall sound without paying the Plexi premium, specimens from 1970 – 1973 are great candidates.

In 1972 EL34 tubes were getting harder to come by, so the American distributor started replacing them with 6550 tubes. In 1973 Marshall switched to printed circuit boards (no more point-to-point hand wiring), marking the end of an era but not the end of classic Marshall tone. These post-1973 amps are considered less valuable, but whether or not they sound different is debatable. Look for more on that era in part two of our history of Marshall amps.

JMP Timeline

– 1959 JMP Super Lead, 100W head

This amp was in production from 1967 up to 1981.

– 1959T JMP Tremolo Lead, 100W head

This amp was in production from 1967 up to 1973. It was the tremolo version of the 1959

– 1961 JMP Lead, 50W 4×10″ combo

This amp was in production from 1967 up to 1972. It used the 1987 tremolo chassis in a 4×10″ combo cabinet.

– 1962 JMP Bass; Lead, 50W 2×12″ combo

This amp was in production from 1967 up to 1972. It used the 1987 tremolo chassis in a 2×12″ combo cabinet.

– 1963 JMP Super PA, 50W head

– 1964 JMP Lead and Bass, 50W Head

– 1968 JMP Super PA, 100W head

This amp was in production from 1967 up to 1975. It had 4 channels and 8 inputs. It was the PA version of the 1959.

– 1982 JMP, 4×12″ 120W cabinet

From 1970 onwards the 1982 cabinet was fitted with four Celestion G12H30 speakers. It was discontinued in 1980 just prior to the introduction of the JCM800 range.

– 1985 JMP PA, 50W head

This amp had 2 channels and 4 inputs. It was the PA version of the 1987.

– 1986 JMP Bass, 50W head

This amp was in production from 1967 up to 1981. This is the Bass version of the 1987 amp. It features a high treble channel and a normal channel.

– 1987 JMP Lead, 50W head

This amp was in production from 1967 up to 1981.

– 1987T JMP Tremolo Lead, 50W head

This amp was in production from 1967 up to 1975.

– 2103 JMP Master Volume Lead, 100W 2×12″ combo

This amp was in production from 1976 up to 1981. This is a 2×12″ combo version of the 2203 head.

– 2104 JMP Master Volume Lead, 50W 2×12″ combo

This amp was in production from 1976 up to 1981. This is a 2×12″ combo version of the 2204 head. Early 2104’s were fitted with two Celestion G12-65 15Ω T3054 speakers, later 2104’s were fitted with two Celestion G12-65 15Ω T3120 speakers.

– 2144 JMP Master Volume, 50W 2×12″ combo

This amp was (probably) in production from 1979 up to 1980. It was fitted with a reverb and a 6dB Boost foot switch. These combo’s were fitted with two Marshall labeled Celestion 12″ speakers. The power amp schematic is the same as of the 2104/2204.

– 2159 JMP Super Lead, 100W 2×12″ combo

This amp was in production from 1977 up to 1981. This is a 2×12″ combo version of the 1959 head.

– 2187 JMP Lead, 50W 2×12″ combo

This amp was in production from 1974 up to 1981. This is a 2×12″ combo version of the 1987 head.

– 2203 JMP Master Volume Lead, 100W head

This amp was in production from 1975 up to 1981.

– 2204 JMP Master Volume Lead, 50W head

This amp was in production from 1975 up to 1981.

– 2959 JMP Lead, 100W head

This amp was in production from 1978 up to 1980. It was fitted with a reverb and a 6dB Boost foot switch. Only a couple of hundred of these amps were manufactured.


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