Vintage 1965 Ampeg Portaflex SB-12 Tube Bass Combo Amp

The 1965 Ampeg Portaflex SB12 is a vintage 22-watt, all-tube combo amplifier featuring a unique flip-top design where the amplifier head inverts and stores inside the speaker cabinet. • First Year of Production: 1965 marked the debut of the SB-12 model, which was originally designed to complement the Ampeg Baby Bass upright electric bass. • Electronics & Power: Delivers around 22 to 25 watts of power driven by an all-tube circuit (typically featuring 7868 power tubes, 12AX7 preamp tubes, and a tube rectifier). • Speaker: Houses a single 12-inch speaker, often an original Jensen Concert series. • Control Layout: Features a simple, minimalist interface with just three control knobs—Volume, Treble, and Bass—alongside two distinct inputs for bass and instruments. • Aesthetics: Early 1965–1967 models typically featured the distinctive blue-check vinyl covering with a gray grille cloth before transitioning to black vinyl