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(!!!!!) (Excellent Pair) 10 Sylvania and Sylvania Philco "engraved base" 1930's NOS (26ma and 29ma) (rare)
(!!!!!) (Excellent Pair) 10 Sylvania and Sylvania Philco "engraved base" 1930's NOS (26ma and 29ma) (rare)
$ 249.99
1 pair) 10 Sylvania and Sylvania Philco "engraved base" 1930's same build (rare)
1 tube) 26ma and Gm=1800 Sylvania Philco NOS
1 tube) 29ma and Gm=2000 Sylvania in white box
Vplate=300V
Vgrid=-15V
Good mA range 20-30ma
Good Gm range 1700-2000
General Information
(Filament=7V @ 1.2A, Vplate=220V, Vgrid=-7V, Iplate=25ma, Mu=6, Rp=6Kohms)
(The VT-25 is built exactly the same as a VT-52, but the plate and grid are spaced differently yielding ifferent Mu factors and plate resistance)
See more: vacuum tube
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 (Excellent Pair) 10 Sylvania and Sylvania Philco "engraved base" 1930's NOS (26ma and 29ma) (rare)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/files/1_47c808cb-589e-437e-a12e-6838910cae9d.jpg?v=1755723691){kind=link}
 (Excellent Pair) 10 Sylvania and Sylvania Philco "engraved base" 1930's NOS (26ma and 29ma) (rare) "Pin It")