(!!!) (Recommended GE Pair) 12SL7GT RCA black plates NOS 1974 (2.1/2.2ma and 2.3/2.4ma) (same Gm)
(!!!!) (Best Audio Pair) PCC88=7DJ8 Philips Holland "A" Frame 1970 (11.5/12.6ma and 11.6/13.6ma) (Similar sound to 6DJ8 Holland)
(!!!) (Recommended PAIR 1953) JAN-CW-231D Western Electric NOS 1953 (1.5ma and 1.5ma)
(!!!) (Recommended PAIR 1953) JAN-CW-231D Western Electric NOS 1953 (1.8ma and 1.8ma)
(!!!) (Recommended Pair) 12BZ7 National Union branded Admiral and Sylvania "U" getter NOS 1960-1961 era (1.6/1.6ma and 1.7/1.8ma)
(!!!) (Recommended Pair) 12BZ7 RCA NOS 1964 and 1968 (1.8/1.8ma and 1.8/1.9ma)
(!!!) (Recommended Pair) 30 RCA Cunningham engraved base 1930's low hours/test like new (3.3ma and 3.4ma)
(!!!!) (Recommended Pair) JAN-CRC-30 RCA NOS 1940's same build (2.9ma and 3.0ma)
(!!!) (Recommended Pair) 311B Amperex made in Russia NOS 1977 (37.2ma and 38.5ma) (Highest mA and Gm)
(!!!) (Recommended Pair) 311B WE used/good 1960-1961 partially faded getters (24.5ma and 26.5ma)
(!!!) (Recommended Pair) 56 National Union rebranded Western Electronics NOS 1940's (4.9ma and 5.1ma)
(!!!) (Recommended Pair) 6AC7 RCA NOS 1950's (11.5ma and 12.2ma)
(!!!) (Recommended Pair) 6AC7 RCA NOS 1970 era (10.0ma and 10.5ma)
(!!!) (Recommended Pair) 6BL7GTA GE and GE branded Admiral 1960's (38/40ma and 35/45ma)
(!!!!) (Best GE Pair #2) 6BX7GT GE "O" getter gray plates 1960's (50/56ma and 53/59ma)
(!!!) (Recommended Pair) 6C4WA GE JAN and JG NOS 1965-1967 (8.4/8.8ma) 1-3% matched
(!!!) (Best Value Pair) 6DJ8 Matshushita JAPAN branded RCA NOS 1975 (15/17.8ma and 16.4/18.2ma)
(!!!) (Best Value Pair) 6FQ7 GE NOS 1978-1979 (5.8/6.2ma and 5.6/6.6ma)
(!!!) (Best Pair #3) 6FQ7 RCA clear top NOS "D" getter halo 1965-1966 (7.4/7.6ma and 7.0/7.8ma) (same Gm)
(!!!) (Recommended Pair) 6FQ7 Sylvania NOS 1970's same build (6.4/6.8ma and 6.4/6.4ma)
