Dating early Fender amplifiers is sometimes quite challenging.
While dating Fender amps made before 1994 by serial number is all but impossible (as records of these numbers were never kept), all hope is not lost—the charts below should prove helpful in dating your Fender amp.
This black-and-silver sticker contains several lines for “sign-offs” on completion of sound and electrical testing.
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.
This is the reason why Marshalls of this early era (up to 1968) are known as “Plexis”.
The sound of this amplifier is “creamy” and “warm”. This amp is more suited for blues players, with a smoother sound.
The switch from 6L6 to the KT66 valve gave Marshall amps a more aggressive tone.
Eventually the KT66 became too expensive causing the jump to EL34 and even more aggression. [Source: Wikipedia] Dating Marshall cabs and amps Info from Wayback Machine Serial number (no barcode) version: Marshall Serial Numbers and Chassis Codes Does it have a serial number stamped on the chassis?
Soon, however, the Model 2210 appeared on the market.