RCA jack, 3.20 mm ID, through-hole right-angle
The 901 is a mono phono (RCA) jack from Keystone Electronics, female, with 2 conductors and 3 contacts, mating to the standard 3.20 mm ID/9.00 mm OD RCA plug. Termination is through-hole right-angle with a kinked pin for retention; the steel body is unshielded and the brass contacts receive a tin plating.
