6SF5GT Sylvania Philco NOS 1940”s (1.1ma Gm=1100)

6SF5GT Sylvania Philco NOS 1940”s

1.1ma

Gm=1100

NOS mA = .9ma

NOS Gm = 1500

(6SF5=6F5 without top cap and 7B4)
(6SF5GT are used in Fi X 2A3/45 SET amp)
(6SF5GT have gain similar to a 12AX7)
(Vplate=240V, Vgrid=-1V, Mu=110, Gm=2120, Rplate=52Kohms, Pout=.48 watts)

– Masco MA-808
– Supro amp
– Fi 2A3