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(!!!) (Best Single) ECC85=6AQ8 RCA Holland NOS 1968 (17.4/23.3ma) (Highest mA and Gm)
(!!!) (Best Value Single) ECC85=6AQ8 Philips Holland NOS 1975 (10/17ma)
(!!) (Best Value Single) ECC85=6AQ8 RCA Canada NOS 1970's (12.6/11.0ma)
(!!) (Best Value Single) ECC85=6AQ8 RCA Canada NOS 1970's faded printing (12.2/13.0ma)
(!!) (Good Value Pair) ECC85=6AQ8 RCA Japan by Hitachi 1970's (10/15ma and 10.4/14.4ma)
(!!) (Recommended Single) ECC85 Siemens Germany NOS rebranded RCA 1969 (16.5/14.5ma)
(!) (Good Value Pair) ECC85 Siemens Halske Germany branded RCA NOS 1966-1969 (9.2/8.6ma and 9.8/9.5ma)
(!) (SINGLE) ECC85=6AQ8 Sylvania black plates NOS 1960's (12.2/9.8ma)
6AQ8=ECC85 Tungsol NOS 1960 era (8.2/8.6ma)
