(!!!) (Best Pair) VT-174=3S4 Tungsol NOS 1943 (100/60 and 100/60)
3S4 GE used/good 1960 era (99/60)
3S4 Philco and Raytheon NOS same build 1940's - 1951 (1 Pair)
3S4 RCA Fordom used/good 1950's (100/60)
3S4 RCA NOS 1950's (95/60)
3S4 RCA NOS 1950's (98/60)
3S4 RCA NOS U getter 1950's (1 pair)
3S4 Tungsol NOS 1944 (101/60)
3S4 Tungsol NOS 1948 (102/60)
