(!!) (Recommended Pair) 5V3=5AU4 Sylvania NOS 1960's (54-54/40 and 54-56/40)
(!) 5AU4 GE NOS 1961 (52/40 and 54/40)
5AU4=5V3 Sylvania NOS 1960's (49/40 and 50/40)
5V3 GE branded ITT NOS 1960's (52/40 and 54/40)
5V3 GE used/tests like new 1959 (58/40 and 60/40)
5V3 Raytheon branded RAD-TEL NOS 1961 (53/40 and 54/40)
5V3A RCA NOS 1962 (47/40 and 48/40)
