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(!!!!) (Best Value Single) EZ81 GE Mullard Blackburn UK NOS 1966 (57/40 and 60/40)
(!!!!) (Best Value Single) EZ81 Mullard Blackburn UK "O" getter like new 1964 (56/40 and 57/40) 1-2% section balance
(!!!!) (Best Value Single) EZ81 Mullard Blackburn UK branded Pope Holland "D" getter used/strong 1963 (56/40 and 57/40)
(!!!!) (Best Value Single) EZ81 Mullard Blackburn UK branded VALVO like new 1964 (57/40 and 58/40)
(!!!!) (Best Value Single) GZ34 Mullard NOS rebranded Tungsram NOS 1972 (54/40 and 60/40)
(!!!!) (Best Value Single) JAN-CHY-5U4G CBS used/very good "D" getter 1946 (53/40 and 53/40) 1% section balance
(!!!!) (Best Value) 5U4G GE NOS 1952 in white box glass slightly tilted (48/40 and 49/40)
(!!!!) (READ REVIEW) 6106 Bendix rebranded 5Y3WGTA Heintz & Kaufman NOS (67/40 and 70/40)
(!!!!) (READ REVIEW) GB-5931 Sylvania brown base gold brand 1960's (60/40 and 65/40)
(!!!!) (Recommended GE Pair) 5U4GB GE NOS 1966 (56-59/40 and 56-58/40)
(!!!!) (Recommended Pair) 5U4GB RCA NOS and like new 1962 (56-58/40 and 56-58/40)
(!!!!) (Recommended Pair) 6CA4 RFT East Germany (Funkwerk) NOS 1970's (48-48/40 and 49-49/40)
(!!!!) (Recommended Pair) 6CA4 RFT East Germany (Funkwerk) NOS 1970's (47-48/40 and 48-48/40)
(!!!!) (Recommended Pair) 6CA4 RFT East Germany (Funkwerk) NOS 1970's (49-49/40 and 48-49/40)
(!!!!) (SINGLE) 5U4GB Raytheon "O" getter NOS 1962 (56/40 and 60/40)
(!!!!) 5U4G GE NOS 1952 (55/40 and 51/40)
(!!!!) UX-280 RCA Radiotron Balloon used/60% 1930 era some white oxide flakes inside tube (38/40 and 38/40)
(!!!) (BEST PAIR) 12AL5 Tungsol NOS 1960 (48-48/40 and 48-48/40)
(!!!) (Best Pair) 5Z4 RCA NOS 1959 (50-50/40 and 51-51/40)
(!!!) (Best Pair) 5Z4 RCA NOS 1959 (51-51/40 and 52-52/40)
