(!!!!) (Best Pair) 5R4GB GE black base NOS 1981 (50-52/40 and 50-53/40 x 2 tubes)
(!!!!) (Best Pair) 5R4GB GE black base NOS 1981 (51-53/40 and 51-54/40 x 2 tubes)
(!!!!) (Best Pair) 5R4GB GE black base NOS 1981 (51-54/40 and 52-55/40 x 2 tubes)
(!!) 5R4GYA GE Hewlett Packard brown base "D" getter halo NOS 1959 (51/40 and 52/40)
(!!) 5R4GYB RCA branded Westinghouse NOS 1970 large getter (50/40 and 52/40)
(!!) 5R4GYB RCA like new 1963 a few oxide filament flakes inside tube slightly tilted glass (50/40 and 52/40)
(!!) 5R4GYB RCA NOS 1962 large getter (54/40 and 50/40)
(!!) 5R4GYB RCA rebranded Raytheon NOS 1960's (50/40 and 53/40)
(!) (BEST VALUE PAIR) 5R4GA GE Amperex NOS 1976 - vertical scratches on bases (50-53/40 and 50-50/40)
5R4GYA GE branded Westinghouse NOS 1960's (50/40 and 53/40)
5R4GYA GE brown base NOS 1961 (50/40 and 52/40)
5R4GYA GE NOS 1959 (48/40 and 50/40)
5R4GYB RCA branded GE NOS 1971 (55/40 and 57/40)
5R4GYB RCA branded Motorola used/good 1970 era small side getter (52/40 and 52/40)
5R4GYB RCA brown base like new 1970's part of glass partially melted into bottom mica (48/40 and 49/40)
5R4GYB RCA brown base NOS 1970's part of glass melted into bottom mica (50/40 and 53/40)
5R4GYB RCA used/very good 1964 (51/40 and 54/40)
