Rectifier Tubes 

274A / 274B
5U4G-Mesh
5Z3-Mesh

Output tubes 

AD1-mesh
2A3-S
2A3-Mesh
45
45-mesh
300B
300B-mesh
300B-XLS
320B-XLS
520B

Driver tubes

20A / 20B / 30A

Problem solvers 

Tube base glue for repairs