Avo twin panel valve tester

Better late than never! As a new member I can't create a new post at the moment so will start here. 50 years on and I finally decided to open my Grandfather's box of history. He was involved with radio during WW2 some of it classified it seems! First thing I found his1939 license for experimental wireless telegraphy! Various valves (100) and a AvoDapter tester with several adapters,
Marconi service manuals ++ and data for various valve tubes. Condition good and bad. I would be grateful for any advice on what to do with this time capsule!
Many thanks
Glyn (Instrument Electrical Technician & DJ retired)