Marshall cabinet serial number dating
This (a)(b)(c) sequence began in 1969 and was valid through 1983.How to read the serial number (1984-1992)In 1984, the order of the serial number components changed to (a)(c)(b), but the method used to determine the values for (a) and (c) remain the same.
Marshall exclusively used Celestion speakers in their amps, and if the speaker is original, it can be dated with the Celestion speaker code (see section on Celestion speaker codes).1979-1981: Some Marshalls made from 1979 to 1981 have the serial number on the front panel.July 1969 - December 1983 EXAMPLE: SL/A 24523 D SL/A = Model Code 24523 = Serial Number E = Date Code This amp would have be a 100 Watt Super Lead 1972 January 1984 - October 1992 EXAMPLE: S/A T 24523 S/A = Model Code T = Date Code 24523 = Serial Number This ampwould have be a 50 Watt 1985 JCM900's The JCM900's began using a Bar Code system which consists of 9 digits which are broken down into three sections.This system was used until 1992, when a bar code system was introduced.(a) Model - The first part of the serial number grouping determines the model of the chassis. (b) Serial number - The second part of the alphanumeric grouping is the five-digit serial number itself.(c) Manufacture date - The last character determines the date of manufacture.Since A was used in both 19, Marshall decided that 1971 would start with C.Z was used for two years, allowing time to convert to the bar coding scheme started in October 1992.
Dating Marshall amplifiers can be challenging, but most information is available to correctly identify the date.
On date codes, they started at A in July 1969, which ran until December 1970.
They then skipped the letter B and started with C in 1971.
Amps from this era are covered in black levant with a black front on heads or gray grille on combos, feature an old block-style Marshall logo, and all chassis' are mounted center.
Model Codes:/A - 200WSL/ - 100W Super Lead SB/ - 100W Super Bass SP/ - Super PAST/ - 100W Tremolo S/ - 50WT/ - 50W Tremolo July 1969-September 1992 - The Marshall date coding system was introduced in 1969.
Using the information in this section, you can attempt to dial in the possible dates of manufacture more closely than by sheer estimation alone.