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(!!) 56 Sparton Balloon engraved base

(!!) 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

 

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