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(!) (SINGLE) 6BQ5=EL84 Heath Mullard Great Britain used/good 1959 (40ma)
(!) (Single) 7189 Mullard UK used/strong 1962 (43.8ma)
(!) 6BQ5 GE used/good 1960's (35.5ma)
(Best Single) 6BQ5 Raytheon NOS 1960's (62ma)
(Best Value Single) 6BQ5 Hitachi Japan used/tests like new 1960's (44.5ma)
(Best Value) 6BQ5 GE branded Westinghouse NOS 1960's (38.5ma)
(Best Value) 6BQ5 GE NOS/80-85% 1959 (36ma)
(READ REVIEW) 7189 Westinghouse gray plate NOS 1960's (46ma)
6BQ5 GE NOS 1960's (40ma)
6BQ5 GE NOS 1973 (71ma) (recommended for FIXED-BIAS amp only due to high current)
6BQ5 GE NOS 1977 (58.5ma)
6BQ5 GE Zenith NOS 1976 (46.2ma)
6BQ5 Lindal Japan like new 1970's (50ma)
6BQ5 Lindal Japan NOS 1970's (42ma)
6BQ5 Lindal Japan NOS 1978 (59.5ma)
6BQ5 RCA gray plate used/good 1967 (32.6ma)
6BQ5 RCA Magnavox gray plate used/good 1961 (44ma)
6BQ5 RCA used/good 1970 (40ma)
7189 Amperex Japan NOS misbranded 7189A NOS 1970 (48.5ma)
7189 CBS gray plate like new 1960 era (46ma)
