(!!) 56 Sparton Balloon engraved base "mesh-plate" used/good 1930's (4.5ma)
$ 42.99
56 Sparton Balloon engraved base "mesh-plate" used/good 1930's in white box
4.5ma
Gm=1200
(Vfilament = 2.5 volts)
Amplitrex Test:
Vplate=250V
Vgrid=-13.5V
Good Iplate used range= 4.0-4.5ma
Good used Gm= 1100-1300
See more: vacuum tube
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 56 Sparton Balloon engraved base "mesh-plate" used/good 1930's (4.5ma)&Category=vacuum tube&ImageURL=http://cdn.shopify.com/s/files/1/0333/7633/products/1_c184c663-a951-4a26-8b1c-fe882155091a.jpg?v=1601477176){kind=link}
 56 Sparton Balloon engraved base "mesh-plate" used/good 1930's (4.5ma) "Pin It")