Alpha

Alpha potentiometers are among the world's most widely used guitar tone and volume controls.
Alpha Products, Inc. was established in 1978 as a privately held, California Corporation. 40+ Years later Alpha is a recognized source for Cable Assemblies, Harnesses, Connectors, Switches, Potentiometers, RF. Devices, Precision Metal & Molded Parts and Contract Manufacturing / Turn Key Assemblies. Alpha's designers specialize in a wide range of standard and customized products.
Lutner's catalog contains the most popular Alpha potentiometers of logarithmic and linear characteristics, with resistances of 25, 250 and 500 kOhm.
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.