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

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