Marshall amp serial numbers dating amps

The raised “Fender” grille logo lost its tail around 76.

There are exceptions to this rule like the the Bronco.

In this article, I’ll try to cover the more “desirable” Marshall amps that were built since 1962 up to the JCM800 series, wich most consider to be the “last” great Marshalls produced (That until Marshall released the Vintage Modern series. I will also try to give examples of where they were used.. I hope you like it These are just a few of the thousands of codes that Marshall came up with for their amps. There were many cosmetic changes on the first years until it finally got the “Classic Marshall Look” by 1964.

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Serial Number: There is no information readily available for dating Fender amps by serial number but there are people working on it. Circuit Code: In 1963 Fender stoped using model numbers to identify schematics and began using the model name and an assigned circuit number.

These circuit numbers which are located on the tube chart can be usefull for getting a rough date on an amp.

The next one or two numbers are the month where January is 1 and December is 12. Example: AB763 = second revision, July, 1963 AA1070 = First revision, October, 1970 Misc Dating Info: Silver face amps with the aluminum trimmed grilles are from 67 or 69.

The fist Master volume controls were first installed in 72.

Marshall then “hot-rodded” the JTM-45 using four KT66 and two 50w output transformers to handle the extra wattage. The result was the JTM-45/100 (JTM-100, for short).

With more power tubes, the amp had more headroom, a tighter bass response and more definition.

It was basically a copy of the 1959 Fender Bassman. In 1965, the plexiglass faceplates were introduced.

This is the reason why Marshalls of this early era (up to 1968) are known as “Plexis”.

You can end up buying something that is not what you expected or even something that is damaged or modded beyond repair.

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