The first model was the B-15N. This amplifier had a 15” speaker and a whopping 25 watts. Later models had 30 watts. A smaller version called the SB-12 came with a 12" speaker.
|1965 SB - 12|
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As the years went on, Ampeg changed hands several times through its history and finally St. Louis Music acquired ownership in 1986. This is the company that brought us Electra guitars and Yairi-Alvarez acoustic guitars and many, many other products.