(!!!!) (Recommended Pair) 5751 RCA black plates low hours/test like new 1961-1962 (2.5/2.5ma and 2.7/2.4ma) (Best Audio Grade 5751) (same Gm)
(!!!!) (Recommended PAIR) 5U4GB Raytheon NOS "O" getters 1962 (58-60/40 x 2 tubes)
(!!!!) (Recommended Pair) 5U4GB RCA NOS and like new 1962 (56-58/40 and 56-58/40)
(!!!!) (Recommended Pair) 5V4G National Union NOS 1951 same date codes (58-59/40 and 57-58/40 x 2 tubes) 1-3% matched
(!!!!) (Recommended Pair) 5V4G RCA 1950's low hours/like new (60-62/40 and 60-64/40)
(!!!!) (Recommended PAIR) 6AC7 RCA NOS 1961 (11.4/12.4ma)
(!!!!) (Recommended Pair) 6BQ5 RCA NOS 1960's (50.5ma and 48.2ma)
(!!!!) (Recommended Pair) 6BQ7A RCA black plates NOS 1964-1968 (9.2/11.2ma and 10.2/11ma)
(!!!!) (Recommended Pair) 6BQ7A RCA black plates NOS 1967 same date codes (11.8/12ma and 11/12.2ma)
(!!!!) (Recommended Pair) 6F6G Marconi Spain NOS 1940's (37.5ma and 39ma)
(!!!!) (Recommended Pair) 6JB6A RCA NOS 1970 era (62ma and 66ma) (DRAKE)
(!!!!) (Recommended Pair) 6LQ6=6JE6C Sylvania NOS 1970 era (76ma and 77ma)
(!!!!) (Recommended Pair) 6SN7GTB RCA branded GE NOS 1966-1967 (10.4/10.6ma and 10.2/11.6ma) (smooth presentation)
(!!!!) (Recommended Pair) 6SN7GTB RCA NOS 1964-1970 (7.2/8.2ma and 7.0/7.4ma)
(!!!!) (Recommended Pair) 6U8A Philips by Sylvania NOS 1986 (15.5/16.0ma and 8.4/8.0ma)
(!!!!) (Recommended Pair) 6U8A Philips by Sylvania NOS 1986 (16.4/16.8ma and 9.2/9.2ma)
(!!!!) (Recommended Pair) 6U8A Philips by Sylvania NOS 1986 (17.2/17.6ma and 8.4/8.6ma)
(!!!!) (Recommended Pair) 6V6GT RCA black plate coated glass like new 1940's and NOS 1954 (49ma and 46ma)
(!!!!) (Recommended Pair) 6V6GTA GE NOS 1960's - 1970 (38ma and 40ma) (Fender, Two Rock, Victoria)
(!!!!) (Recommended Pair) 7199 RCA black plates NOS 1960's (12/6.6ma and 13.2/7.0ma)
