RCA 6J4 "NOS", 7 pin, 6.3V. Made in USA
The 6J4 valve is a 7-pin triode used in radio and television receivers. Today it is used in DIY audio amplifier projects, as a valve preamp. It can replace any 6J4W, CV1763, CV5029, CV5311 or 8532. This 6J4 is a Mil Spec RCA, meaning it is designed for longer life and reliability than commercial grade valves.