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I missed your question earlier, but if you're still looking (or for others that google brings):
The valve sockets are not numbered on the chassis, nor is there a layout diagram.
Looking from front (CRT face) to back:
Top "shelf" -
Immediately behind the focus control - ECL80
The 3 behind the ECL80 are all Osram Z309s
Immediately behind the power switch/intensity control - 12AT7
The 2 7 pin behind the 12AT7 are both Osram Z77
The bottom "shelf" contains only a 12AT7 (assumed - all but the "T7" has rubbed off) and a 5V4G rectifier.
Never seen/heard of the Osram Z309 or Z77, though google suggests the Z77 may be compatible with the EF91.
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