(!!!!) (Highest Testing Pair) 71A Philco and Aristocrat test like new 1930's similar build (32.2ma and 32.5ma) 1-3% matched

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1 pair) 71A Philco and Aristocrat test like new 1930's similar build - different shape top mica 1 tube) 32.2ma Gm=2000 Aristocrat 1 tube) 32.5ma Gm=2100 Philco Matched on Amplitrex Vplate = 180V Vgrid = -38V Good Ma = 20ma Good Gm = 1700 (71A=5V @ .25A Filament) Typical Characteristics: Vplate=135V, Vgrid=-27, Iplate=17.5ma, Rplate=1.82Kohms Gm=1650, Mu=3, Rload=3Kohms, Pout=0.4watts Show more