Here are some relevant datasheets I've collected:
6AT6
6aq5
6cg7
6l6_1 6l6_2 6l6_3 6l6_4
Phillips Tube Codes
6sn7gt 6sn7gta1 6sn7gta2
6v6_2 6v6_3 6v6a
7025_1 7025_2
2SK170
2SK369
VTL5C1-2 VTL5C2X2-3X2 VTL5C3-4 VTL5C4X2
437a
ec8020 curves
ZM1040
A2293
LM7512
