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(!!!!) (BEST SINGLE #2) 5992=6V6GT Bendix used/very good 1950's (37.6ma) (rare)
(!!!!) (Best Single #2) 6146B GE NOS 1981 (107ma)
(!!!!) (Best Single #2) 6SN7GTB RCA NOS 1957-1958 (8.8/9.6ma)
(!!!!) (Best Single #2) 7581A GE NOS 1979 (87ma)
(!!!!) (Best Single #2) ECC803S=12AX7 Telefunken Qualitex Ulm Germany <> bottom like new 1964 (1.3/1.5ma and Gm=1600/1800)
(!!!!) (Best Single #2) JAN-5998 Tungsol NOS black plates NOS 1966 same build as 421A Western Electric (117ma/141ma) (close Gm balance)
(!!!!) (Best Single #2) JAN-5998 Tungsol NOS black plates NOS 1966 same build as 421A Western Electric (94ma/100ma) (close triode section balance)
(!!!!) (Best Single #3) 6146B GE NOS 1979 (98ma)
(!!!!) (Best Single #3) 7581A GE NOS 1979 (76ma)
(!!!!) (Best Single #3) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (12.0/10.2ma)
(!!!!) (Best Single #3) EF86 Telefunken Germany <> bottom NOS gray shield 1972 (2.8ma) (Neumann, Lawson, Soundelux, Manley)
(!!!!) (Best Single 1953) 12BH7 Sylvania Motorola black oval plates "D" getter like new 1953 (14.6/13.8ma) (High mA and Gm)
(!!!!) (Best Single 1956) 12AX7 GE Motorola tall gray ribbed plates "U" getter 1956 like new (Gm=1700/2000 and 1.6/2.1ma)
(!!!!) (Best Single 1956) ECC82=12AU7 Siemens Halske "Long Ribbed Plates" and large/wide "U" getter branded Haltron 1956 (10/9.2ma) (k62 series) (High Gm) (rare)
(!!!!) (Best Single 1958) 12AX7 GE tall gray ribbed plates "U" getter 1958 like new (Gm=1800/1800 and 1.3/1.3ma) 1% section balance
(!!!!) (Best Single 1960) 12AX7 GE tall gray ribbed plates "U" getter NOS 1960 (Gm=1700/1600 and 1.5/1.1ma)
(!!!!) (Best Single 1960) 12AX7 Westinghouse NOS gray pinched plates "D" getter 1960 (Gm=1700/1800 and 1.3/1.4ma)
(!!!!) (Best Single 1963) PCC88=7DJ8 Philips Miniwatt Holland "O" getter NOS 1963 (14.2/12.0ma)
(!!!!) (Best Single 1965) CV491=12AU7=ECC82 Mullard UK NOS ribbed plates 1965 (12.5/11.8ma) (High Gm)
(!!!!) (Best Single) 5692 RCA RED BASE black plates like new 1950 (10.0/9.2ma)