During the 1960s Ampeg only produced fairly low wattage combo amplifiers.Rock concerts were becoming increasingly large affairs and bigger amplifiers were needed.The current Ampeg company is mainly known in the field of bass amps.They also have a line of guitar amplifiers and a remake of the Dan Armstrong guitar and bass. Louis Music (also makers of Crate amps) was purchased by LOUD Technologies Inc.
The code follows the format: = a number from 1 - 52 indicating the week of manufacture.
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.
Although the company specializes in the production of bass amplifiers (for bass guitars and double basses), they also manufacture guitar amplifiers.
The closest they came to a rock'n roll endorser at one point, was by way of Joe Long, a left-handed bass player of the Four Seasons, who played the company's Horizontal Bass.
This was further compounded by the one chief competitor Hull disliked the most; Fender, as they continually bested Ampeg in overall sales.