1 pair) 45 RCA Radiotron 1930”s – 1940”s used/good in white boxes

same plate style – different top mica shapes

1 tube) 20.2ma Gm=1350 (75%) 1940 era printed base

1 tube) 19.0ma Gm=1300 (70%) 1930”s engraved base

– sound nice in SET amp

Tested on Amplitrex

Vplate=275V

Vgrid=-54.8V

Good used ma 25-30ma

Good used Gm 1500-1800

Recommended for

Tektron

Deja Vu

Victor RE-36 1929

DIY