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(!!!!) (Best Value Pair) 6B4G Raytheon NOS 1940's separate plates, 1 branded Philco (90ma and 91.5ma)
(!!!!) (Best Value Pair) 6B4G Raytheon NOS 1940's separate plates, 1 branded Philco (90ma and 91.5ma)
By Tube World
$ 149.99
1 matched pair) 6B4G Raytheon NOS 1940's separate plates
1 tube) 90.0ma Gm=5850 Raytheon branded Philco same build
1 tube) 91.5ma Gm=5600 Raytheon - hairline crack in base - see pic
Test Data:
Vplate=225V
Vgrid=-30V
GOOD NOS Ma range 70-90ma
GOOD NOS Gm = 5200
Recommended for
(6B4G=6.3V filament)
(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)
See more: vacuum tube
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 (Best Value Pair) 6B4G Raytheon NOS 1940's separate plates, 1 branded Philco (90ma and 91.5ma) "Pin It")