1 Matched Pair) 6B4G Sylvania NOS 1940's plates connected - same build - springs hold up filament wires

1 tube) 92ma Gm=6100 branded Philco

Test Data: Vplate=225V, Vgrid=-30V

(NOS Ma range 80-100ma)

(NOS Gm = 5200)

Technical Information

(6B4G is electrically equivalent to 6A3, but 6A3 has UX-4 pin base and 6B4G has 8 pin octal base)

(The best sounding 6B4G are 1940's-1950's: Ken Rad, Tungsol, Sylvania, Raytheon)