JJ 5881 Power Tube
The JJ 5881 Power Tube is a beam power pentode with a maximum plate dissipation of 23W in the classical short bulb. It is very similar to the 6L6 sound but with less power. It can be used in any 6L6 amplifier.
The JJ 5881 is versatile with respect to playing styles. It is warm and tight with top end chime.
The datasheet for the JJ 5881 can be found here.