(!!!) 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
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