Alpha potentiometers are among the world's most widely used guitar tone and volume controls. Each pot has an aluminum split shaft that fits a coarse-knurled (18-spline) knob.
500K pots are standard controls for humbuckers. Compatible with the long-shaft pot for Les Paul and similar guitars.
Shaft diameter: 6mm split shaft, coarse knurling
Thread: 3/8" x 32
Threaded portion height: 3/4" (19.05mm)
Required mounting hole diameter: 3/8" (9.52mm)
Alpha pots are audio taper with standard ±20% resistance tolerance. Each pot includes a flat washer, lock washer, and two hex mounting nuts for custom height adjustment on a pickguard or control plate.
Which pot value should you choose?
500K pots are standard controls for humbuckers, and 250Ks are usually used for single-coil pickups. A 250K gives a slightly warmer tone than a 500K, and bleeds off some of the high frequencies to ground. A 1-meg pot bleeds off even less than a 500K—try one if you want to hear your guitar "wide open."
1-meg pots are also ideal for piezo pickups, as the ultra high impedance piezo element is more adversely effected by conventional, lower-value pots than magnetic pickups.
25K pots are for controlling the volume or tone of active pickups, or for use after the preamp of a piezo-saddle transducer bridge.