(!) 30 Philco engraved base NOS 1930”s (3.7ma)

1 tube) 30 Philco engraved base NOS 1930”s (3.7ma)

3.7ma
Gm-900

NOS Ma = 3ma
NOS Gm = 800-900

(ST12 or T9 bulb shape on UX-4 base, Vfil=2V @ 60ma, Mu=9.3, Variant=1230)
(VT-67=30 Special)

– LINCOLN DC SW-33 radio 1933