CTS 500K linear pot short shaft
Typically 250K pots are used for single coil pickups and 500K pots for humbucker pickups. The bigger the resistance value, the brighter the sound will be/ less highs will bleed off. 1MEG can be used to make humbuckers sound brighter.
The taper of a pot refers to the way its resistance changes as the shaft is rotated. A linear taper pot will work in a linear way related to shaft rotation. As the human ear is not linear in response to increasing volume an audio or logarithmic pot will work best for volume applications.
A split, knurled shaft will hold most knobs. Sometimes the knob is mounted using a set screw. You should order a solid shaft pot, or align the set screw with the split for correct mounting. Bushing: The standard bushing in most American guitars is diameter is 3/8" or 9,5mm and CTS is offers these measurements. Another industry standard is M8, as used by guitar builders outside of the USA and available with ALPHA pots from Taiwan, or any other pot on this site. When space is limited mini pots are used with a shaft diameter of 7mm. The standard bushing length is .375" for inch type pots and 10mm for metric type pots. Using two nuts it is very easy to set the correct bushing length for knob placement. Specially for pickguard (ST, PB) or control plate mount (TE, JB) the .250" short bushing from CTS will fit perfectly using only one nut. For use with a thick or carved top (LP USA) you should order the 'long shaft' CTS with a bushing length of .750".
CTS is a factory standard for most USA brands like Fender and Gibson. ALPHA is a good alternative, nowadays used as a factory standard by Ibanez, Epiphone and Squier.
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