(!!) (Recommended Pair) 6BL7GT GE "D" getter NOS 1957 same build (34/36ma and 37/32ma)
(!!) (Slightly Microphoinic Single) 6072A RCA black plates NOS 1971 (2.6/3.0ma)
(!!) (slightly microphonic single) 12BZ7 RCA gray plates NOS 1966 (2.3/3.0ma)
(!!) (Slightly microphonic single) 6SN7GT Brimar UK NOS slightly microphonic 1960 era (6.8/7.8ma)
(!!) (slightly microphonic) 12AU7A Raytheon black ribbed plates "D" getter halo black coated glass 1951 (8.8/9.6ma)
5963 RCA black ribbed plates" and D getter halo NOS 1957 (sold out - read review)
(!!) (slightly microphonic) 6SL7GT RCA NOS 1950 (2.2/2.3ma) 1-2% section balance
(!!) (slightly microphonic) 6SL7GT RCA NOS black plates gray coated glass 1952 (2.8/2.8ma) 1% section balance
(!!!) (Best Value Pair) 6SN7GTA GE used/good 1952 (8.0/7.4ma and 8.2/7.2ma)
(!!) (slightly microphonic) JHS-12AT7 Sylvania black plate "D" getter 1953 (11.2ma/11.2ma) 1% section balance
(!!) (~ Best Value Pair ~) 56 Sylvania test like new 1940's (5.3ma and 5.5ma)
(!!) (~ Best Value ~) 12AT7 Toshiba JAPAN black plates rebranded CM Curtis Mathes NOS 1960's copper grid posts (9.0/9.2ma)
(!!) (~ Best Value ~) 12AT7 Toshiba JAPAN rebranded "LINDAL TUBE JAPAN" NOS 1960's copper grid posts (13.8/15.4ma)
(!!!!) (Recommended Pair) 5842=417A Amperex "PQ" USA Nickel Pins "O" getter halo NOS 1985 (35ma and 37ma)
(!!) (~ Recommended Pair ~) 6JD6 GE branded RCA NOS same date codes (13ma and 14ma)
(!!) (Recommended Single) 12AT7 Amperex by Mullard NOS 1966 (8.8ma/10.8ma)
(!!!!) (Best Single) 12AX7WA Sylvania NOS 1970's (Gm=3000/3100 and 2.5/2.5ma)
(!!) (Recommended Single) 12BZ7 RCA gray plates NOS 1968 mica slightly tilted (2.1/2.2ma) (High Gm)
(!!) 12AT7 Brimar black plates NOS/70-75% 1955 (5.6/5.8ma)
(!!) 12AT7 Brimar England black plates "U" getter used/good 1950's (6.0/6.4ma)
