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(!) (Best Single) 6111 France NOS 1962 (7.0/7.4ma) (close triode balance)
(!) (Best Single) 7N7 Sylvania NOS 1960 era (10.8/11.2ma)
(!) (Best Single) E83F=6689 Siemens Holland NOS gold pins 1968 (15.2ma)
(!) (BEST VALUE PAIR) EL84 Brimar England NOS 1962 (67ma and 66ma) (recommended for FIXED-BIAS amp only due to high current)
(!) (Good Single) 7N7 Sylvania branded GE NOS 1961-1962 (7.5/8.3ma)
(!) (microphonic single tube) E182CC=7119 Philips SQ Holland NOS "O" getter halo 1963 (39.0ma/39.2ma)
(!) (READ REVIEW) CV1377=GZ34 Mullard Blackburn UK NOS 1976
(!) (SINGLE) JAN-6DJ8 GE NOS 1982 (13/16.8ma)
(!) (slightly microphonic) 6072 GE branded RCA triple mica black plates "O" getter halo 1960 used/good (2.0/2.0ma)
(!) 1L6 Sylvania NOS 1956 (112/60)
(!) 1L6 Sylvania NOS 1957 smeared printing (20/16)
(!) 5687 RCA black plates used/good 1961 (33/33.5ma)
(Best Single) E130L=7534 Amperex by Valvo Germany NOS 1962 in Amperex box (102ma)
(READ REVIEW) 7247=12DW7 Mullard England rebranded Hammond and Bogen 1965-1970 (1.2/10ma and 1.1/10ma) (1-3% matched)
(READ REVIEW) JG-5814A=12AU7 GE triple mica NOS "o" getter 1958-1959 (9.8/9.6ma) 1-2% section balance
(slightly microphonic) 7062 Amperex Holland "PQ" NOS large "O" getter halo 1962 (6.8/7.0ma)
1614 GE NOS 1962 (66ma)
1614 RCA NOS 1957 (58ma)
1614 RCA NOS/75% 1973 (55ma)
5814A RCA NOS 1970 era slightly microphonic (10.2/11.2ma)