(!!!) (BEST PAIR) 6463 GE NOS 1966 (16.8/21ma and 17.6/21.5ma) (Highest mA and Gm)

1 pair) 6463 GE NOS "O" getter same date codes 1966 (JV)

1 tube) 16.8/21.0ma Gm=5850/5900

1 tube) 17.6/21.5ma Gm=6100/6200

Tested on Amplitrex

Vplate=250V

Vgrid=-9V

Good Ma =12-15ma

Good Gm = 5000 

Filament=12.6VCT @ 300ma, 10,000 hour computer rated duotriode, 4.4W
DIFFERENT PINOUT than a ECC86, CANNOT! be directly subbed!
9CY pinout pattern, which is same as a 6350

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