ML6, CV1105, VR105, VT105, SMALL SIGNAL, B5
The ML6 ceramic based triode was simply a version of the ML4 adapted for operation in sets powered by vehicle batteries.
ML6s were widely used as RF oscillators in medium-sizes military transmitters, in particular the RAF T1154 where they acted as driver valve for the PT15 output valves.
Today, they are prized for their superlative performance in audio applications where they can sound simply superb.