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(!!) 12AX7 Hitachi Japan branded Bell and Howell used/good 1962 (Gm=1500/1400)
6BQ5 Lindal Japan like new 1970's (50ma)
6BQ5 Lindal Japan NOS 1970's (42ma)
6BQ5 Lindal Japan NOS 1978 (59.5ma)
6BW4 Sylvania black plates used/good 1954-1955
