(!!!) (Best Pair) 12B4A GE NOS 1960's (47ma and 48ma)
$21.99
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1 pair) 12B4A GE NOS 1960's same build1 tube) 47ma Gm=7900 GE1 tube) 48ma Gm=8100 GE Admiral Matched on Amplitrex Vplate=140 Vgrid=-15V Good Ma range 25-40ma Good Gm = 6000 - Mapletree Ear+ Purist Headphone amp- Mapletree Audio Design Ear+ Purist HD 2007- Ultra-Fi linestage- Graham Ingle, Black Cat Electronics- Experience Music DHT
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