12B4/12B4A/Matched Pair
9 pin miniature triode
6.3v/.6 - 12.6v/.3 amp heater
NOS
Sylvania
Low Mu triode
Black plate
5.5 Max plate dissipation
Amplification- 5.5
1030 plate resistance
Interesting little power triode
Would make a great lower power audio amplifier,
inexpensive and plentiful supply