Since there is a possibility of overlap here, cosmetics are a huge factor in determining the year.
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In dating Ampeg Amplifiers, there are several different schemes to be used. made amps, the speakers, transformers, and potentiometers have date codes on them.
The good thing about Ampeg is that when they changed their models, they all changed at the same time. This along with the serial number on the amp can help narrow down the year of manufacture.
This means that it is fairly easy to determine the range of year by just looking at the outside of the amp. There are six distinctive periods in the Ampeg line.
Each period has a different way of identifying the year made. When Hull started on his own, the name was switched to Ampeg and were mostly wooden amps with Ampeg written across the grille.1953-Mid 1965 - In 1953, the first Serialization system was introduced.Note that each different period is approximately during each different ownership. Pre 1953 - These amps can only be dated by the EIA (Electronics Industries Association) codes on the speakers and other parts. This was a six-digit number like this: YMMNNN, which was the last digit of the year, month, and number of production.Ampeg has been a huge part of amplifier history, with amplifiers dating back to the mid 1940s that have been used by bands such as The Rolling Stones, Pink Floyd, Television, Booker T and the MG's, The Clash and others. Being able to place specific products in their time period is a great way to assess value and impress fellow gearheads.Ampeg did utilize serial numbers when producing their amps, but these numbers can sometimes be inaccurate.The best way to date an Ampeg amp is based on its specific features and characteristics.The Pro Series delivers the power and tone required by today’s modern bass players.