(!!!) (Best Value Pair) 71A Sylvania branded Raytheon NOS 1947 (25.2ma and 29.2ma) Title: 71A Sylvania branded Raytheon NOS Pair 1947

1 pair) 71A Sylvania branded Raytheon NOS 1947

1 tube) 25.2ma Gm=1900

1 tube) 29.2ma Gm=2000

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