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  • (!!!!) 56 Arcturus Blue Balloon engraved base tests like new 1930's (5.0ma)
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(!!!!) 56 Arcturus Blue Balloon engraved base tests like new 1930's (5.0ma)

$67.99 $79.99


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1943 56 all Balloon black plate engraved base RCA Radiotron Sparton Sylvania triode


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Preamp tubes
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  • Description

56 Arcturus Blue Balloon engraved base tests like new 1930's in white box

5.0ma

Gm=1300

 

 

(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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