(!!!) (Best Pair #3) 56 Sylvania black plate NOS 1940”s branded Western Electronics 1946 slightly tilted glass (5.5ma and 5.6ma) (same Gm)

1 pair) 56 Sylvania black plate NOS 1940”s branded Western Electronics 1940”s original boxes, 4 metal prongs on top mica, same internals – slightly tilted glass

1 tube) 5.5ma Gm=1500

1 tube) 5.6ma Gm=1500

Amplitrex Test:

Vplate=250V

Vgrid=-13.5V

Iplate good range = 4.5-5.5ma

Gm=1400

– Inspire LP-27A