(!!!) (Recommended Pair) 56 Sylvania black plate NOS 1943 (6.3ma and 6.2ma)
$ 27.99
1 pair) VT-56 Sylvania black plate NOS 1943 original boxes, 4 metal prongs on top mica, same internals
1 tube) 6.3ma Gm=1600
1 tube) 6.2ma Gm=1500
(Vfilament = 2.5 volts)
Amplitrex Test:
Vplate=250V
Vgrid=-13.5V
Iplate good range = 4.5-5.5ma
Gm=1400
- Inspire LP-27A
See more: vacuum tube
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 (Recommended Pair) 56 Sylvania black plate NOS 1943 (6.3ma and 6.2ma) "Pin It")