|Dual gang 50kΩ 16mm logarithmic taper potentiometer with spline tooth shaft|
This potentiometer can be used in the Stereo Valve Preamplifier. This value is hard to get in this style of pot but it suits driving devices with a relatively high load impedance.
Note that because it has a spline shaft, not all types of knob will necessarily fit. The types with a grub screw generally work OK, or those designed for spline shafts. Also the shaft is quite short, which means you won't have to cut it down but it will not protrude a long way through a thick panel either.