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(!!!) (Best Balloon 50) 450=50 Sparton Balloon tests like new 1930 era (61.5ma) (High mA and Gm) (rare 50)
(!!!) (Best Balloon 50) 450=50 Sparton Balloon tests like new 1930 era (61.5ma) (High mA and Gm) (rare 50)
$ 349.99
450=50 Sparton Balloon tests like new 1930 era in white box - rattle inside base - dried glue particles from age - base is tight to glass
61.5mA
Gm=2480
Tested on Amplitrex
Vplate=440V
Vgrid=-66V
Good NOS mA range = 55-60ma
Good NOS Gm = 2100
See more: vacuum tube
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 (Best Balloon 50) 450=50 Sparton Balloon tests like new 1930 era (61.5ma) (High mA and Gm) (rare 50) "Pin It")