Ampeg cabinet serial number lookup6/11/2023 ![]() These B-15s are most easily recognized by the random flair navy tolex, the distinctive power knob, their shared tone control circuit, and the lack of a lucite light up logo.Īt the outset, the B-15’s preamp section consisted of three 6SL7 preamp tubes and two 6L6GC power tubes. ![]() Geared toward acoustic bassists, this initial model featured extra porting options for use with upright basses. The Portaflex B-15 model was first introduced in 1960 for $355. Though you can easily find out when an amp was produced by the serial number, you’ll start to see that Ampeg switched model numbers mid-year, and the distinctions aren’t always cut and dried. This article will examine those differences chronologically to help better understand what you can expect from the dusty Portaflex at your local shop. ![]() Though every B-15 I’ve come across has an undeniable mojo to it, it’s rare to find two B-15s that sound exactly the same. The evolution of the B-15 is truly fascinating. Jimi Hendrix performs on The Dick Cavett Show
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