(!!!) (Best Balloon 50) 450=50 Sparton Balloon tests like new 1930 era (61.5ma) (High mA and Gm) (rare 50)
$349.99
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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
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