![Wade Bequest collection of valves: full-wave rectifier radio valve](https://coimages.sciencemuseumgroup.org.uk/448/691/medium_thumbnail_smg00237730.jpg)
Wade Bequest collection of valves
Wade Bequest collection of valves
![Wade Bequest collection of valves: full-wave rectifier radio valve](https://coimages.sciencemuseumgroup.org.uk/448/691/medium_thumbnail_smg00237730.jpg)
![Wade Bequest collection of valves: early triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/599/medium_thumbnail_smg00237638.jpg)
Wade Bequest collection of valves: early triode radio valve
![Wade Bequest collection of valves: full-wave rectifer radio valve](https://coimages.sciencemuseumgroup.org.uk/448/596/medium_thumbnail_smg00237635.jpg)
Wade Bequest collection of valves: full-wave rectifer radio valve
![Wade Bequest collection of valves: early triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/595/medium_thumbnail_smg00237634.jpg)
Wade Bequest collection of valves: early triode radio valve
![Wade Bequest collection of valves: Early triode valve by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/598/medium_thumbnail_smg00237637.jpg)
Wade Bequest collection of valves: Early triode valve by Marconi-Osram
![Wade Bequest collection of valves: early triode radio valve by Marconi-Osram, 1926](https://coimages.sciencemuseumgroup.org.uk/448/597/medium_thumbnail_smg00237636.jpg)
Wade Bequest collection of valves: early triode radio valve by Marconi-Osram, 1926
1926
![Wade Bequest collection of valves: early triode radio valve by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/602/medium_thumbnail_smg00237641.jpg)
Wade Bequest collection of valves: early triode radio valve by Marconi-Osram
![Wade Bequest collection of valves: early triode radio valve by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/601/medium_thumbnail_smg00237640.jpg)
Wade Bequest collection of valves: early triode radio valve by Marconi-Osram
![Wade Bequest collection of valves: experimental triode radio valve by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/600/medium_thumbnail_smg00237639.jpg)
Wade Bequest collection of valves: experimental triode radio valve by Marconi-Osram
![Wade Bequest collection of valves: triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/604/medium_thumbnail_smg00237643.jpg)
Wade Bequest collection of valves: triode radio valve
![Wade Bequest collection of valves: full-wave recitifier radio valve](https://coimages.sciencemuseumgroup.org.uk/448/605/medium_thumbnail_smg00237644.jpg)
Wade Bequest collection of valves: full-wave recitifier radio valve
![Wade Bequest collection of valves: early triode radio valve by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/608/medium_thumbnail_smg00237647.jpg)
Wade Bequest collection of valves: early triode radio valve by Marconi-Osram
![Wade Bequest collection of valves: radio valve without base](https://coimages.sciencemuseumgroup.org.uk/448/607/medium_thumbnail_smg00237646.jpg)
Wade Bequest collection of valves: radio valve without base
![Wade Bequest collection of valves: World War One German triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/610/medium_thumbnail_smg00237649.jpg)
Wade Bequest collection of valves: World War One German triode radio valve
1916
![Wade Bequest collection of valves: early triode radio valve by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/611/medium_thumbnail_smg00237650.jpg)
Wade Bequest collection of valves: early triode radio valve by Marconi-Osram
![Wade Bequest collection of valves: experimental triode radio valve by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/603/medium_thumbnail_smg00237642.jpg)
Wade Bequest collection of valves: experimental triode radio valve by Marconi-Osram
1915
![Wade Bequest collection of valves: early tetrode radio valve by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/606/medium_thumbnail_smg00237645.jpg)
Wade Bequest collection of valves: early tetrode radio valve by Marconi-Osram
1916
![Wade Bequest collection of valves: pentode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/609/medium_thumbnail_smg00237648.jpg)
Wade Bequest collection of valves: pentode radio valve
![Wade Bequest collection of valves: experimental Catkin triode radio valve by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/613/medium_thumbnail_smg00237652.jpg)
Wade Bequest collection of valves: experimental Catkin triode radio valve by Marconi-Osram
![Wade Bequest collection of valves: four-electrode radio valve by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/612/medium_thumbnail_smg00237651.jpg)
Wade Bequest collection of valves: four-electrode radio valve by Marconi-Osram
1920
![Wade Bequest collection of valves: early triode radio valve by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/614/medium_thumbnail_smg00237653.jpg)
Wade Bequest collection of valves: early triode radio valve by Marconi-Osram
![Wade Bequest collection of valves: early four-electrode radio valve by Marconi-Osram. With B4-3 base](https://coimages.sciencemuseumgroup.org.uk/448/616/medium_thumbnail_smg00237655.jpg)
Wade Bequest collection of valves: early four-electrode radio valve by Marconi-Osram. With B4-3 base
![Wade Bequest collection of valves: early triode radio valve by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/617/medium_thumbnail_smg00237656.jpg)
Wade Bequest collection of valves: early triode radio valve by Marconi-Osram
![Wade Bequest collection of valves: early triode radio valve by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/615/medium_thumbnail_smg00237654.jpg)
Wade Bequest collection of valves: early triode radio valve by Marconi-Osram
![Wade Bequest collection of valves: experimental triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/620/medium_thumbnail_smg00237659.jpg)
Wade Bequest collection of valves: experimental triode radio valve
![Wade Bequest collection of valves: early triode radio valve, by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/625/medium_thumbnail_smg00237664.jpg)
Wade Bequest collection of valves: early triode radio valve, by Marconi-Osram
![Wade Bequest collection of valves: early triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/626/medium_thumbnail_smg00237665.jpg)
Wade Bequest collection of valves: early triode radio valve
![Wade Bequest collection of valves: early triode radio valve by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/622/medium_thumbnail_smg00237661.jpg)
Wade Bequest collection of valves: early triode radio valve by Marconi-Osram
![Wade Bequest collection of valves: early R-type triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/619/medium_thumbnail_smg00237658.jpg)
Wade Bequest collection of valves: early R-type triode radio valve
![Wade Bequest collection of valves: early R-type triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/623/medium_thumbnail_smg00237662.jpg)
Wade Bequest collection of valves: early R-type triode radio valve
![Wade Bequest collection of valves: early triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/618/medium_thumbnail_smg00237657.jpg)
Wade Bequest collection of valves: early triode radio valve
![Wade Bequest collection of valves: miniature radio valve mounted in valve](https://coimages.sciencemuseumgroup.org.uk/448/621/medium_thumbnail_smg00237660.jpg)
Wade Bequest collection of valves: miniature radio valve mounted in valve
![Wade Bequest collection of valves: R-type triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/628/medium_thumbnail_smg00237667.jpg)
Wade Bequest collection of valves: R-type triode radio valve
![Wade Bequest collection of valves: early R-type triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/629/medium_thumbnail_smg00237668.jpg)
Wade Bequest collection of valves: early R-type triode radio valve
![Wade Bequest collection of valves: experimental radio valve](https://coimages.sciencemuseumgroup.org.uk/448/632/medium_thumbnail_smg00237671.jpg)
Wade Bequest collection of valves: experimental radio valve
![Wade Bequest collection of valves: R-type triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/631/medium_thumbnail_smg00237670.jpg)
Wade Bequest collection of valves: R-type triode radio valve
![Wade Bequest collection of valves: triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/624/medium_thumbnail_smg00237663.jpg)
Wade Bequest collection of valves: triode radio valve
![Wade Bequest collection of valves: early triode radio valve by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/594/medium_thumbnail_smg00237633.jpg)
Wade Bequest collection of valves: early triode radio valve by Marconi-Osram
![Wade Bequest collection of valves: early triode radio valve by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/627/medium_thumbnail_smg00237666.jpg)
Wade Bequest collection of valves: early triode radio valve by Marconi-Osram
![Wade Bequest collection of valves: experimental radio valve](https://coimages.sciencemuseumgroup.org.uk/448/630/medium_thumbnail_smg00237669.jpg)
Wade Bequest collection of valves: experimental radio valve
![Wade Bequest collection of valves: triode radio valve, by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/593/medium_thumbnail_smg00237632.jpg)
Wade Bequest collection of valves: triode radio valve, by Marconi-Osram
![Wade Bequest collection of valves: small triode radio valve, by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/592/medium_thumbnail_smg00237631.jpg)
Wade Bequest collection of valves: small triode radio valve, by Marconi-Osram
1921
![Wade Bequest collection of valves: small triode radio valve, by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/590/medium_thumbnail_smg00237629.jpg)
Wade Bequest collection of valves: small triode radio valve, by Marconi-Osram
![Wade Bequest collection of valves: experimental radio valve, 1918](https://coimages.sciencemuseumgroup.org.uk/448/591/medium_thumbnail_smg00237630.jpg)
Wade Bequest collection of valves: experimental radio valve, 1918
1918
![Wade Bequest collection of valves: experimental triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/589/medium_thumbnail_smg00237628.jpg)
Wade Bequest collection of valves: experimental triode radio valve
![Wade Bequest collection of valves: triode radio valve, by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/588/medium_thumbnail_smg00237627.jpg)
Wade Bequest collection of valves: triode radio valve, by Marconi-Osram
![Wade Bequest collection of valves: R-type triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/587/medium_thumbnail_smg00237626.jpg)
Wade Bequest collection of valves: R-type triode radio valve
![Wade Bequest collection of valves: small triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/586/medium_thumbnail_smg00237625.jpg)
Wade Bequest collection of valves: small triode radio valve
![Wade Bequest collection of valves: small diode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/584/medium_thumbnail_smg00237623.jpg)
Wade Bequest collection of valves: small diode radio valve
![Wade Bequest collection of valves: early transistors mounted in plastic tube](https://coimages.sciencemuseumgroup.org.uk/448/585/medium_thumbnail_smg00237624.jpg)
Wade Bequest collection of valves: early transistors mounted in plastic tube
![Wade Bequest collection of valves: Small transmitting triode, by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/635/medium_thumbnail_smg00237674.jpg)
Wade Bequest collection of valves: Small transmitting triode, by Marconi-Osram
![Wade Bequest collection of valves: Small transmitting triode](https://coimages.sciencemuseumgroup.org.uk/448/634/medium_thumbnail_smg00237673.jpg)
Wade Bequest collection of valves: Small transmitting triode
![Wade Bequest collection of valves: Small R-type triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/633/medium_thumbnail_smg00237672.jpg)
Wade Bequest collection of valves: Small R-type triode radio valve
![Wade Bequest collection of valves: Small R-type triode radio valve without base](https://coimages.sciencemuseumgroup.org.uk/448/638/medium_thumbnail_smg00237677.jpg)
Wade Bequest collection of valves: Small R-type triode radio valve without base
1917
![Wade Bequest collection of valves: Small R-type triode radio valve without base](https://coimages.sciencemuseumgroup.org.uk/448/637/medium_thumbnail_smg00237676.jpg)
Wade Bequest collection of valves: Small R-type triode radio valve without base
![Wade Bequest collection of valves: Small R-type triode radio valve without base](https://coimages.sciencemuseumgroup.org.uk/448/636/medium_thumbnail_smg00237675.jpg)
Wade Bequest collection of valves: Small R-type triode radio valve without base
1916
![Wade Bequest collection of valves: Small R-type triode radio valve without base](https://coimages.sciencemuseumgroup.org.uk/448/640/medium_thumbnail_smg00237679.jpg)
Wade Bequest collection of valves: Small R-type triode radio valve without base
![Wade Bequest collection of valves: Very small triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/641/medium_thumbnail_smg00237680.jpg)
Wade Bequest collection of valves: Very small triode radio valve
![Wade Bequest collection of valves: Box containing two transistors](https://coimages.sciencemuseumgroup.org.uk/448/639/medium_thumbnail_smg00237678.jpg)
Wade Bequest collection of valves: Box containing two transistors
![Wade Bequest collection of valves: Box containing two transistors and two diodes](https://coimages.sciencemuseumgroup.org.uk/448/644/medium_thumbnail_smg00237683.jpg)
Wade Bequest collection of valves: Box containing two transistors and two diodes
![Wade Bequest collection of valves: V24-type radio valve](https://coimages.sciencemuseumgroup.org.uk/448/643/medium_thumbnail_smg00237682.jpg)
Wade Bequest collection of valves: V24-type radio valve
![Wade Bequest collection of valves: Experimental four-electrode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/647/medium_thumbnail_smg00237686.jpg)
Wade Bequest collection of valves: Experimental four-electrode radio valve
![Wade Bequest collection of valves: V24-type radio valve](https://coimages.sciencemuseumgroup.org.uk/448/646/medium_thumbnail_smg00237685.jpg)
Wade Bequest collection of valves: V24-type radio valve
![Wade Bequest collection of valves: V24-type radio valve. Tubular bulb with two end caps and two side caps](https://coimages.sciencemuseumgroup.org.uk/448/642/medium_thumbnail_smg00237681.jpg)
Wade Bequest collection of valves: V24-type radio valve. Tubular bulb with two end caps and two side caps
![Wade Bequest collection of valves: V24-type radio valve](https://coimages.sciencemuseumgroup.org.uk/448/645/medium_thumbnail_smg00237684.jpg)
Wade Bequest collection of valves: V24-type radio valve
![Wade Bequest collection of valves: V24-type radio valve](https://coimages.sciencemuseumgroup.org.uk/448/650/medium_thumbnail_smg00237689.jpg)
Wade Bequest collection of valves: V24-type radio valve
![Wade Bequest collection of valves: V24-type radio valve](https://coimages.sciencemuseumgroup.org.uk/448/649/medium_thumbnail_smg00237688.jpg)
Wade Bequest collection of valves: V24-type radio valve
![Wade Bequest collection of valves: V24-type radio valve](https://coimages.sciencemuseumgroup.org.uk/448/648/medium_thumbnail_smg00237687.jpg)
Wade Bequest collection of valves: V24-type radio valve
![Wade Bequest collection of valves: DEQ radio valve](https://coimages.sciencemuseumgroup.org.uk/448/653/medium_thumbnail_smg00237692.jpg)
Wade Bequest collection of valves: DEQ radio valve
![Wade Bequest collection of valves: V24-type radio valve](https://coimages.sciencemuseumgroup.org.uk/448/652/medium_thumbnail_smg00237691.jpg)
Wade Bequest collection of valves: V24-type radio valve
![Wade Bequest collection of valves: V24-type radio valve](https://coimages.sciencemuseumgroup.org.uk/448/651/medium_thumbnail_smg00237690.jpg)
Wade Bequest collection of valves: V24-type radio valve
![Wade Bequest collection of valves: V24-type radio valve](https://coimages.sciencemuseumgroup.org.uk/448/656/medium_thumbnail_smg00237695.jpg)
Wade Bequest collection of valves: V24-type radio valve
![Wade Bequest collection of valves: Small triode radio valve without base](https://coimages.sciencemuseumgroup.org.uk/448/655/medium_thumbnail_smg00237694.jpg)
Wade Bequest collection of valves: Small triode radio valve without base
![Wade Bequest collection of valves: Small triode radio valve without base](https://coimages.sciencemuseumgroup.org.uk/448/654/medium_thumbnail_smg00237693.jpg)
Wade Bequest collection of valves: Small triode radio valve without base
![Wade Bequest collection of valves: Small triode radio valve without base](https://coimages.sciencemuseumgroup.org.uk/448/583/medium_thumbnail_smg00237622.jpg)
Wade Bequest collection of valves: Small triode radio valve without base
![Wade Bequest collection of valves: Catkin triode radio valve, by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/582/medium_thumbnail_smg00237621.jpg)
Wade Bequest collection of valves: Catkin triode radio valve, by Marconi-Osram
![Wade Bequest collection of valves: Catkin triode radio valve, by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/579/medium_thumbnail_smg00237618.jpg)
Wade Bequest collection of valves: Catkin triode radio valve, by Marconi-Osram
![Wade Bequest collection of valves: Catkin triode radio valve, by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/576/medium_thumbnail_smg00237615.jpg)
Wade Bequest collection of valves: Catkin triode radio valve, by Marconi-Osram
![Wade Bequest collection of valves: Small triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/580/medium_thumbnail_smg00237619.jpg)
Wade Bequest collection of valves: Small triode radio valve
![Wade Bequest collection of valves: Marconi-Osram radio valve](https://coimages.sciencemuseumgroup.org.uk/448/573/medium_thumbnail_smg00237612.jpg)
Wade Bequest collection of valves: Marconi-Osram radio valve
![Wade Bequest collection of valves: Small B11 triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/577/medium_thumbnail_smg00237616.jpg)
Wade Bequest collection of valves: Small B11 triode radio valve
![Wade Bequest collection of valves: DEQ radio valve](https://coimages.sciencemuseumgroup.org.uk/448/581/medium_thumbnail_smg00237620.jpg)
Wade Bequest collection of valves: DEQ radio valve
![Wade Bequest collection of valves: V24 radio valve](https://coimages.sciencemuseumgroup.org.uk/448/578/medium_thumbnail_smg00237617.jpg)
Wade Bequest collection of valves: V24 radio valve
![Wade Bequest collection of valves: DEV radio valve. Tubular bulb with two end caps and two side caps](https://coimages.sciencemuseumgroup.org.uk/448/574/medium_thumbnail_smg00237613.jpg)
Wade Bequest collection of valves: DEV radio valve. Tubular bulb with two end caps and two side caps
![Wade Bequest collection of valves: DEV radio valve. Tubular bulb with two end caps and two side caps](https://coimages.sciencemuseumgroup.org.uk/448/571/medium_thumbnail_smg00237610.jpg)
Wade Bequest collection of valves: DEV radio valve. Tubular bulb with two end caps and two side caps
![Wade Bequest collection of valves: DEV radio valve. Tubular bulb with two end caps and two side caps](https://coimages.sciencemuseumgroup.org.uk/448/575/medium_thumbnail_smg00237614.jpg)
Wade Bequest collection of valves: DEV radio valve. Tubular bulb with two end caps and two side caps
![Wade Bequest collection of valves: small triode radio valve, by Osram-GEC](https://coimages.sciencemuseumgroup.org.uk/448/568/medium_thumbnail_smg00237607.jpg)
Wade Bequest collection of valves: small triode radio valve, by Osram-GEC
![Wade Bequest collection of valves: Early triode radio valve described as 'soft' Silver valve](https://coimages.sciencemuseumgroup.org.uk/448/570/medium_thumbnail_smg00237609.jpg)
Wade Bequest collection of valves: Early triode radio valve described as 'soft' Silver valve
![Wade Bequest collection of valves: Cosmos 'short path' radio valve](https://coimages.sciencemuseumgroup.org.uk/448/567/medium_thumbnail_smg00237606.jpg)
Wade Bequest collection of valves: Cosmos 'short path' radio valve
![Wade Bequest collection of valves: LT1 radio valve](https://coimages.sciencemuseumgroup.org.uk/448/572/medium_thumbnail_smg00237611.jpg)
Wade Bequest collection of valves: LT1 radio valve
![Wade Bequest collection of valves: R4 triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/569/medium_thumbnail_smg00237608.jpg)
Wade Bequest collection of valves: R4 triode radio valve
1917
![Wade Bequest collection of valves: DEVX triode radio valve, by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/658/medium_thumbnail_smg00237697.jpg)
Wade Bequest collection of valves: DEVX triode radio valve, by Marconi-Osram
![Wade Bequest collection of valves: UV202 triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/657/medium_thumbnail_smg00237696.jpg)
Wade Bequest collection of valves: UV202 triode radio valve
![Wade Bequest collection of valves: Triode radio valve, by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/659/medium_thumbnail_smg00237698.jpg)
Wade Bequest collection of valves: Triode radio valve, by Marconi-Osram
![Wade Bequest collection of valves: DEVX triode radio valve, by Marconi-Osram](https://coimages.sciencemuseumgroup.org.uk/448/661/medium_thumbnail_smg00237700.jpg)
Wade Bequest collection of valves: DEVX triode radio valve, by Marconi-Osram
![Wade Bequest collection of valves: NR18 triode radio valve](https://coimages.sciencemuseumgroup.org.uk/448/660/medium_thumbnail_smg00237699.jpg)
Wade Bequest collection of valves: NR18 triode radio valve
![Wade Bequest collection of valves: Seddig RJW radio valve made in Wurtzburg](https://coimages.sciencemuseumgroup.org.uk/448/662/medium_thumbnail_smg00237701.jpg)
Wade Bequest collection of valves: Seddig RJW radio valve made in Wurtzburg
![Wade Bequest collection of valves: R2A radio valve](https://coimages.sciencemuseumgroup.org.uk/448/664/medium_thumbnail_smg00237703.jpg)
Wade Bequest collection of valves: R2A radio valve
![Wade Bequest: DE6 triode radio valve with blue tint](https://coimages.sciencemuseumgroup.org.uk/448/663/medium_thumbnail_smg00237702.jpg)
Wade Bequest: DE6 triode radio valve with blue tint
![Wade Bequest: DE6b triode radio valve with green tint](https://coimages.sciencemuseumgroup.org.uk/448/665/medium_thumbnail_smg00237704.jpg)