1954 - 1980
Luckily Marantz serial numbers include the information needed to calculate production numbers and more !
There are two basic patterns. 1. Earlier units proceed in pure sequential order starting from zero or a specific starting number as follows: 0 for models 10, 24 1000 for 1, 2, 3, 4, 5, 8, 8B, 9, 10B, 15, 16, 18, 19, 20, 20B, 22, 25, 26,27, 28, 29, 32, 105, 110, 115, 115B, 120, 120B, 125, 150, 240, 250, 250M, 500, 510M, 1200, 2010, 2015, 2200, 2240, 2245, 2270, 2440, 3300, 3600, 3800, 4060, 4100, 4220, 4230, 4240, 4270, 4415, 4430 10000 for 7, 7C, 7T 100000 for 2235, 2250B. Also some later units have a "J4" suffix which indicates the unit is equipped with a universal power transformer. Inside a terminal strip allows the unit to be switched between 100V, 120V, 200V, 220V, 240V voltage sources. 2. Later units are sequential but within only each production run. Example: 93N040085. In this case "04" indicates the fourth production run and the last four digits represent the sequentialproduction number within this run. When this method was adopted a letter was added to indicate the region of the world for which the unit was primarily intended to be sold: A = Australia C = Canada E = Europe K = Far East N = unknown, usually found in Europe P = Post Exchange U = USA. It appears that most if not all non - USA models include an external voltage selector which allows usage anywhere in the world. Later a two digit prefix was added to replace the manufacturing date stamp that was formerly found on the chassis. The first digit indicates the year, we believe the second digit indicates the six week period within the year. The following models overlap both numbering systems: 112, 140, 1030, 1040, 1060, 1070, 1090, 2215, 2215B, 2225, 2230, 2235B, 2275, 2325, 4300, 4400. When the change was made the production run number started at the correct number (indicating they were keeping track).
Listed below is our initial report of production numbers. As the database grows so will the accuracy !
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