PTA Series - Low Profile Slide Potentiometer PTA Series low profile slide potentiometers with a metal housing and a long life carbon element. The PTA series slide potentiometers are available in three lengths of travel and single or dual gang options. Applications for the PTA series include audio/TV sets, car radio, amplifiers/mixers/drum machines/synthesisers, PCs/monitors and appliances 20, 45 or 60 mm travel options