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(!!!!!) (Recommended Pair) 5U4GB HYTRON NOS 1960 "O" getter halos (56-58/40 and 57-58/40)
(!!!!!) (Recommended Pair) 5U4GB HYTRON NOS 1960 "O" getter halos (60-64/40 and 60-66/40)
(!!!!) (Best Pair 1963) 5U4GB GE NOS 1963 same date codes (60-62/40 and 60-60/40 x 2 tubes)
(!!!!) (Best Pair 1968) JAN-6189 Sylvania NOS 1968 (9.2/9.8ma and 9.8/9.5ma) 1-3% matched (same Gm)
(!!!!) (Best Pair) D3a=7721 Siemens Germany NOS 1978 (32.5/33ma) 1% matched
(!!!!) (Recommended Pair) JAN-12AT7WC Philips by Sylvania black plates NOS 1981-1982 (8.3/8.4ma and 8.4/7.8ma)
(!!!!) (Single) JAN-6189 Sylvania NOS 1968 (9.0/8.2ma)
(!!!) (Best Mullard Single) 12AT7WA=CV4024=M8162 Mullard UK NOS 1964 (14/10ma)
(!!!) (Best Pair) 5U4GB Sylvania NOS 1960's (59-62/40 and 60-62/40)
(!!!) (READ REVIEW) GZ34 Mullard UK shield logo NOS 1962 (59/40 and 59/40)
(!!!) (Recommended Single) GZ34 Zaerix Japan by Matsushita NOS similar sound and build to Mullard NOS 1970's (60/40 and 60/40)
(!!) (Best Single) JAN-5693 GE JAN Black Can NOS 1978 (3.0ma)
(!) (BEST VALUE PAIR) 5R4GA GE Amperex NOS 1976 - vertical scratches on bases (50-53/40 and 50-50/40)
(!) (READ REVIEW) GZ34 Mullard UK shield logo NOS 1962
(!) (Single) 6L6WGB=5881 Sylvania black base NOS 1975 (78.5ma)
5736 Westinghouse 1978 display tube open filament
