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(!) (Best Single) 6DQ6B RCA NOS 1970's (120ma)
(!) (BEST SINGLE) 6HF5 Sylvania NOS 1970 era (117.5ma)
(!) (BEST SINGLE) 6JB6 Sylvania branded RCA NOS 1970's (81ma)
(!) (BEST SINGLE) 6JB6A RCA NOS 1970 era (100ma)
(!) (Best Single) 6JT6A Sylvania tipped top NOS 1970 era (93ma)
(!) (Best SIngle) 6L6G RCA NOS black plate and gray coated glass 1951 (68ma)
(!) (Best Single) 6L6GB Sylvania Black Plate NOS 1958 (73ma) (rare)
(!) (Best Single) 6LU8 GE Admiral NOS 1971 (3.4/64.5ma)
(!) (Best Single) 6V6GT Tungsol gray plate coated glass NOS 1951-1956 (64ma)
(!) (Best Single) 7408=6V6GT Sylvania branded Amperex NOS 1974 (41.5ma) (rare)
(!) (Best Single) EL84 Siemens Halske Germany NOS 1972 (54.5ma)
(!) (BEST SINGLE) JAN-CDZ-811 Electronic Enterprises by RCA NOS 1954 (62/36)
(!) (BEST VALUE PAIR) EL84 Brimar England NOS 1962 (67ma and 66ma) (recommended for FIXED-BIAS amp only due to high current)
(!) (Best Value Pair) US Navy-CNU-1626 National Union NOS 1940's (30ma and 32.5ma)
(!) (Best Value Single) 6L6GC Sylvania NOS 1960's internals tilted (95ma)
(!) (Best Value used) 5998 Tungsol branded IBM black plates used/good 1961 very small rattle inside base (68ma/67ma)
(!) (BEST VALUE) EL34 Philips Holland brown base used/good 1960 era (95.5ma)
(!) (Good Value Pair) 6S4A RCA USA black plate NOS 1960's - 1970's (19ma and 18.8ma)
(!) (Good Value) 6BQ5 Sylvania gray plate used/very good 1960's faded printing (47.5ma)
(!) (PAIR) 12DQ6B GE NOS 1961 and 1973 (55ma and 51ma)
