The B-15N boasts a powerful twin-6L6 power section, three 12AX7 preamps, and a 5AR4 tube rectifier, along with an Eminence 15” speaker. What’s more, each preamp’s selectable bias mode can be used with either preamp, allowing for even more subtle tone shaping. More importantly, the B15 sounds warm, round, and resonant - as suitable for jazz and soul players as it was for the growing army of rock and garage band aficionados.Īmpeg’s Heritage Series B-15N added a few key twists to this legendary design, notably the introduction of two separate preamp sections: one modeled after the spongier, quicker-to-distort 1964 preamp, a 25-watt cathode-based circuit and the other the slightly cleaner and midrange-forward 1966 version, built around a 30-watt, fixed bias design. With its clever “tube cage,” the amp’s pair of 6L6 power tubes and three 6SL7 preamp tubes are kept out of harm’s way while the head was inside the cabinet.
Forever associated with Motown bass legend James Jamerson, as well as Stax low-end kingpin Donald “Duck” Dunn, the Ampeg B-15 Portaflex (short for “portable reflex cabinet”) features a distinctive “flip-top” 30-watt all-tube head, complete with classic two-band Baxandall EQ, that could live inside the double-baffled 1x15 cabinet (typically a Jensen P15N speaker) while travelling, and flip upright to sit atop the cabinet during recording or gigs.
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