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Description
1 pair) 231D Western Electric NOS original boxes (439=1954) same date codes
1 tube) 1.6ma Gm=500
1 tube) 1.6ma Gm=500
General Information
3V Filament @ 60ma, Vplate=90V, Iplate=2.1ma, Mu=8.4, Gm=510, Rp=16Kohms, Pout=4.5mW
Similar to UV-199 and 864
