12DW7 Sylvania rebranded RCA tests like new 1961 era (1.0ma/11.2ma)
$ 44.44
12DW7=7247 Sylvania rebranded RCA tests like new 1961 era in white box
12AX7 Section = 1.0ma Gm=1600
12AU7 Section = 11.2ma Gm=2400
Tested on Amplitrex
12AX7 Section Good = 1-1.2ma Gm=1600-1800
12AU7 Section Good = 8-10ma Gm=1800-2200
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