Fantastic working and cosmetic condition overall, perfect studio recording amplifier. The original Ampeg speaker cable is long gone, now has a hardwired/modified cable configuration (see pics).
The Ampeg B-18N Portaflexbass amplifier was introduced in 1963 as a larger and more powerful companion to then popular B-15N. This B-18N has the Jensen PLM series 18 inch speaker and shares the B-15N's preamp circuit. At 50 watts, the B-18N had twice the power of the B-15N. It was designed as a dual channel amp, with two inputs for channel 1 (Guitar, Bass), and one input for channel 2 (Instrument). Each channel had the separate controls for bass, treble and volume.
Please reach out if you have any questions about this rig!