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(!!!) 31 RCA Radiotron Balloon NOS 1920's (13.2ma)

(!!!) 31 RCA Radiotron Balloon NOS 1920's (13.2ma)

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31 RCA Radiotron Balloon NOS 1920's (13.2ma) Gm=1100

1 TUBE ONLY 

 

Vplate=180V

Vgrid=-30V

Good NOS Ma = 11 -12ma

Good Gm = 1000

See more: vacuum tube
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