(!) (#1 231D Best Value Pair) 231D Western Electric NOS 1953 (1.8/1.8ma)
$139.99
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1 pair) 231D WE NOS original boxes (352=1953) same date codes 1 tube) 1.8ma Gm=500 1 tube) 1.8ma 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
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