(!!!) 231=31 US Made Balloon NOS 1920's (14.2ma)
By Tube World
$ 29.99
231=31 US Made Balloon NOS 1920's
14.2ma
Gm=900
1 TUBE ONLY
Vplate=180V
Vgrid=-30V
Good NOS Ma = 11 -12ma
Good Gm = 900-1000+
See more: vacuum tube
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 231=31 US Made Balloon NOS 1920's (14.2ma) "Pin It")