(!!!) (Best Single) 7247=12DW7 Mullard UK rebranded RCA NOS 1972 (1.6ma and 14.5ma)
$ 69.99
7247=12DW7 Hammond Mullard ribbed plates like new 1964
12AX7 Section = 1.0ma Gm=1600 (good)
12AU7 Section = 11.8ma Gm=2100 (very strong)
Tested on Amplitrex
12AX7 Section NOS Good = 1-1.2ma Gm=1500-1600
12AU7 Section NOS Good = 8-10ma Gm=1800-2200
See more: vacuum tube
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 (Best Single) 7247=12DW7 Mullard UK rebranded RCA NOS 1972 (1.6ma and 14.5ma) "Pin It")