(!!!) (Best Pair) 56 National Union rebranded Western Electronics NOS 1940”s (6.5ma and 6.9ma) (Highest mA and Gm)

1 pair) 56 National Union rebranded Western Electronics NOS 1940”s

1 tube) 6.5ma Gm=1500 taller glass – on left

1 tube) 6.9ma Gm=1600

Matched on Amplitrex

Vplate=250V

Vgrid=-13.5V

Good Ma range = 4.5 – 5ma

Good Gm range = 1300-1400

(76=Type 56 with a 6.3V Filament and also is similar to type 37)

UX-5 pin socket

– Tube Audio Lab FF preamp
– Korneff preamp