• CV14x range of infrared image converters
• Mercury arc rectifiers
• TR Cell
• Trigatron
• Valves removed from the collection

• Frank's electron tube pages
• Duncan Amps TDSL3
• Åke's Tubedata

• Hans-Thomas Schmidt's collection
• UK National Valve Museum
• The Thermionic Website - Valve info and projects

• CV marked valves - information CV-marked valves including date and manufacturer codes and history.
• 1944 CV Register of Electronic Valves
• 1946 CV Register of Electronic Valves
• 1963 CV Register of Electronic Valves
• Joint Service Specification K1001
• E numbers (also some A-numbers)
• Decoding valve numbers
• Radioactive valves
• Valve base diagrams and dimensions

The following are links to external sources of information:

• Philips factory codes - Philips factory codes (pdf) on Frank's website