(!!!!) (Recommended Pair) 307A=VT-225 National Union NOS 1940's (68.5ma and 73ma)

$ 79.99

1 matched pair) 307A=VT-225 National Union NOS mid-1940's, same build, both have very small rattles inside base - dried glue particles due to age of tubes - tubes work perfectly

1 tube) 68.5ma Gm=5250

1 tube) 73.0ma Gm=5450


Good Ma range = 45-50ma

Gm Gm = 4000


(307A=VT-225 Sylvania / Ken-Rad, Identical to Western Electric, 6 Watt Pentode)
(The 307A is a 306A with a quick heating filament, 5.5V @ 1A filament,
5-pin bayonet socket with top cap)

- Peter Millett headphone amp

- Eddie Current Balancing Act-

See more: vacuum tube
Scroll to top