Given its cool features and history, the Ampeg B-15 is definitely treasure. Fjestad is a freelance writer who specializes in guitars and amplifiers including the history behind them and their current value.
In fact, most amplifiers had accordion inputs throughout the 1960s, and Ampeg amps were never really marketed to rock players until Hull left the company in 1968.
Ampeg went through numerous ownership changes over the next two decades with Unimusic taking over in 1967, Magnavox in 1971, and MTI in 1980. Louis Music bought Ampeg in 1985 and finally returned some stability and respect to the brand.
He sent us Parts 1 and 2 of a 4-part You Tube series he made about the classic equipment.
Part 1 deals with what “the sound” is and how to get it, while Part 2 goes into detail about identifying the date of your gear.
The company also reissued the B-15N Portaflex with blue check covering in 1995.