Fender 400 PS (1970-1975) is a 435-watt RMS vacuum tube bass amplifier with a "normal" channel featuring reverb and vibrato, suitable for both guitars and bass instruments. It boasts a deep switch and bass, treble, and volume controls for the bass channel, as well as a bright switch and bass, middle, treble, and volume controls for the normal channel. The master volume dial controls the overall volume of the bass and normal channels. Additionally, the amplifier has reverb and vibrato jacks for foot control, allowing the player to turn these effects on and off while playing.