Marconi DEQ triode detector from 1923. Intact filament - rare!
Click the picture above for an example of the images available to museums friends.

www.r-type.org has always been free to use, but running the museum has costs that exceed the small amount of paid advertising. If you support the museum as a friend you gain access to the full size exhibit images, films and larger vintage adverts, as well as a monthly update email and advanced search to help identify unknown valves.

⚪ Stats as of 08/05/2026 ⚪

⚪ 8,670 valve exhibits with a total of 24,961 exhibit pictures ⚪

⚪ 5,162 data sheets, 13,479 equivalents, 48 vintage films, 597 articles, 213 mini features ⚪

⚪ 1,859 makers adverts and 474 boxes ⚪

⚪ British Radio Valves: 1916 - 1960. Keith R Thrower ⚪

⚪ 2022 Supplement: Data on 6,500 valves ⚪

To support the museum as a friend the minimum donations are: £8.00 for six months, £14.50 for a year or £29.00 for three years.

The museum (as an ISO file on a 64 Gb SDHC card) and two years as a friend of the museum is available from £48.00. SD cards have increased in price.

Email contact: allan^@virtual-museums.org