Of course the United States and Europe are turning out amazing guitars and basses that are more technologically advanced than ever before.
Musical instruments are now made with computer aided design and CNC tools that give them excellent tonality.50 years ago there were no computerized tools.
Each group uses a unique serialization scheme that can be used to assist in dating the amps, but in many cases, it is the features and characteristics of the amps that determine the year of manufacture.
Electronic Industries Association (EIA) codes can also be very useful for giving clues as to an amp's age.
Ampeg is a manufacturer of musical instruments, especially the musical instrument amplifier, established by Everett Hull and Stanley Michaels in 1946, and now headquartered in Woodinville, Washington.
Research, development and upgrades in amplifier modeling have given even a small practice amp some very usable tones that would make a kid from 1965 envious.
In 1962, Ampeg relocated to Linden, New Jersey, and became a publicly owned company after an initial public stock offering the following year.
In September, 1967 Ampeg became a subsidiary of Unimusic, Inc.
Ironically in 1965 most of the amplifiers available were tube amps.
For many years since '65, guitarists have sought that warm tube tone and breakup, but in 1965 when a clean sound with lots of headroom was desirable, most low wattage tube amps distorted like crazy.