(!!) (#1 37 Pair) 37 RCA like new 1940”s (7.7ma and 7.8ma) 1% matched

1 matched pair) VT-37=37 RCA like new 1940”s same build reboxed

1 tube) 7.7ma Gm=1100

1 tube) 7.8ma Gm=1100

Test parameters:

Vplate=250V

Vgrid=-18V

Good Iplate Ma range = 6.5-8ma

Good Gm=1000-1100

(Filament=6.3V @ 300ma, many think the 37 sounds better than the 76)