50 K B-taper (linear) snap-in style potentiometer. "D" shaft design. Fits push-on style knobs.
Used in X-15, Bullet Amp, Bronco™, Princeton® 112+, RAD, JAM, Automatic GT™, Acoustasonic™ Jr./Jr. DSP/30 DSP/Ultralight, Blues Junior™, Princeton 65 DSP/650, and Jazzmaster Ultralight™ amplifiers manufactured from 1990-Present.