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Blackface, early 1965 with "Fender Electric" text on control panel, piggyback head and cabinet with all mounting hardware and tilt-back legs, 50 watts from two 6L6s, 2x12" loudspeakers in a sealed cabinet, two channels,...
50-watt Marshall head, the Model 1986, bass variant of the 1987, plexi panels front and back, small box, lay-down mains transformer, black levant vinyl, gold piping, repro logo, Bulgin AC mains socket replaced with modern IEC, small...
Electronic Industries Association (EIA) codes can also be very useful for giving clues as to an amp's age.
These codes can be found on speakers, transformers, pots, capacitors, and multi-section electrolytic "can" caps.
It has a note at the top of the page that they were reprinting with permission from the authors of Ampeg: The Story Behind the Sound, ©1999, published by Hal Leonard.
If anyone feels this page should be taken down, please feel free to contact me.
This information original was found on The Unofficial Ampeg Page ( which appears to be dead.
I pulled this information from Google's cache of the site.
WARNING: Ampeg amplifiers, especially the high-powered amps such as the SVT and V-series, contain lethal voltages even when unplugged and turned off.
All-original except grounded plug (original gray cord included). Big brother of the tweed Harvard model, one of the most recorded amps in history. Here we have a vintage 1964 Ampeg M-15 "Big M" combo amp.