ECC99 JJ ELECTRONIC
DOUBLE TRIODE AUDIO FREQUENCY AND R.F.
DOUBLE TRIODE AUDIO FREQUENCY AND R.F.
ECC99 is a 9-pin DOUBLE TRIODE usually used as a driver for directly heated power triodes (i.e. 300B and 2A3), but in some applications can be used as power tube (headphones amps, small power amps...).
Data sheet