That adapter is going to cover most of the missing sockets. Left to right:
B9G (EF50 and others) RADAR IF strips, etc. and the WS19 & WS62.
Mazda Octal - most of the receiver and small octal-based transmitter valves.
B5 - T1154 PA valves (PT15), HV rectifiers in CRT displays.
B7 - WS 9 & 52 receiver valves and probably others.
There was an adapter box for the I-177 that added some of the later sockets but not the British or European valves. (MX-949U, I think.)
Chris.
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