56 RCA Balloon engraved base black plate tests like new 1930's (4.7ma)
$49.99
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56 RCA Radiotron Balloon engraved base black plate tests like new 1930's in white box 4.7ma Gm=1500 (Vfilament = 2.5 volts) Amplitrex Test: Vplate=250V Vgrid=-13.5V NOS Ma range = 4.5-5.2ma NOS Gm=1400
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