Actual Year of Introduction. Classification by year the valve was introduced in the UK

Approximate Date of Manufacture. Valves listed by decade of manufacture where known

Base Type. Valves listed by the base fitted to the envelope.

Construction Index. Details of the production technology and envelope shape used.

Data Sheets Attached to Exhibits. Click the valve name within the exhibit page to open the data sheet

Electrode System Index. Valves classified by the electrode system in the envelope. i.e. triode pentote etc.

Equivalents Index. Listings of valve types, electrode system and characteristics for exhibits and non-exhibits.

Heater Characteristics. Organised by heater voltage or current.

Makers Design Purpose. A broad classification by original usage

Manufacturer Index. Valves organised alphabetically within an alphabetical listing of makers names

Master Index. All exhibits presented by name, in one large single list.

New and Ammended Entries. All exhibits listed by date of last update. New exhibits listed first.

Pins on Base. If all else fails match the thumbnail for your unmarked valves.

Some Important British Valves Keith Thrower's selection of landmark developments

Timeline of Valve History. Major milestones of valve technology development.

Valve Name Index. Alphabetic Listing of Valves by Type Designation