1G4, (directly heathed triode).
1LE3, (directly heathed triode).
2A3, (directly heathed triode).
3A5, (directly heathed triode).
3B7, (directly heathed triode).
211, (directly heathed triode).
211 + 845 biasing, (directly heathed triodes).
300B, (directly heathed triode).
615, (directly heathed triode).
811A, (directly heathed triode).
845, (directly heathed triode).
6286, (directly heathed triode).
M7, (directly heathed triode).
S6, (directly heathed triode).
UX199, (directly heathed triode).