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(!) (Single) E288CC=8223 Siemens Halske Germany NOS 1974 (36/35ma)
(!!!) (Best Value Single) 12AX7=ECC83 SIEMENS HALSKE GERMANY used/good 1967 (0.8/0.9ma)
(!) (Single) 12AZ7A Tungsol gray plates "O" getter halo NOS 1960 era (8.4ma/9.0ma)
(!) (Single) 12SN7GTA RCA black plates NOS 1960's (8.4/8.0ma)
(!!!) (Best Single 1962) JHS-12AX7 Sylvania NOS 1962 (Gm=2600/2500 and 1.8/1.9ma)
(!!!) (Best Pair) VT-174=3S4 Tungsol NOS 1943 (100/60 and 100/60)
(!) (- Best Value) JAN-5847A=404A Amperex USA NOS 1988 (23ma and 24ma)
(!!) (PAIR) JAN-CRC-6AC& RCA used/tests like new 1955-1957 (12.6/11.0ma) (close Gm)
(!!!!) (Best Overall Pair) 7247=12DW7 Mullard UK NOS rebranded RCA 1972 (1.2/11.5ma and 1.2/11.4ma) 1% matched
(!) (slightly microphonic single) CV4004=12AX7 Mullard NOS 1981 (1.3/2.1ma)
(!) (BEST PRICE) 7E5=1201 US Brands NOS (4 tubes for $14.99)
(!) (Best RCA Pair) 6SG7 RCA metal can NOS 1961 (11.6/12.4ma)
(!) (SINGLE) 417A/5842 LM Ericsson Sweden NOS "O" getter halo 1960's (35ma and Gm=29,700)
(!!) (Best Single #2) 6111 France NOS 1962 (8.0/7.0ma)
(!) (Best Single) 6111 France NOS 1962 (7.0/7.4ma) (close triode balance)
(!) (BEST SINGLE) 6BA6 Brimar England NOS 1960's (10.8ma)
(!!!) (Best Value Pair) 12A Sylvania NOS and Philco like new 1930's - 1940's same build (6.7ma and 6.8ma)
(!!!) (Best Single) ECH81=6AJ8 Mullard Holland NOS 1962 (6.8ma and 13.5ma)
(!) (Good Value) 6SN7GTB CBS black base black plates side-getter NOS, the same shape as Sylvania 6SN7GTB 1960 (6.8/7.2ma)
(!) (PAIR) 6D6 RCA Cunningham used/good 1930's (62/40 and 62/40)
