![](https://coimages.sciencemuseumgroup.org.uk/451/100/large_thumbnail_smg00239274.jpg)
![](https://coimages.sciencemuseumgroup.org.uk/451/100/large_thumbnail_smg00239274.jpg)
![](https://coimages.sciencemuseumgroup.org.uk/451/214/large_thumbnail_smg00240441.jpg)
V.H.F. diode, type SD6/12/1.0
![](https://coimages.sciencemuseumgroup.org.uk/393/900/large_thumbnail_smg00164369.jpg)
Mounted semiconductor diode by Philip Harris Ltd.
1960-1983
![](https://coimages.sciencemuseumgroup.org.uk/456/598/large_thumbnail_smg00263748.jpg)
Diode with screw base and lateral anode-lead
![](https://coimages.sciencemuseumgroup.org.uk/449/879/large_thumbnail_smg00241014.jpg)
Ferranti DS6A BN diode
![](https://coimages.sciencemuseumgroup.org.uk/449/880/large_thumbnail_smg00241015.jpg)
Ferranti DS6C BT diode
![](https://coimages.sciencemuseumgroup.org.uk/453/77/large_thumbnail_smg00261228.jpg)
Mullard Double Diode
1938
![](https://coimages.sciencemuseumgroup.org.uk/449/884/large_thumbnail_smg00241019.jpg)
GEC EW99 diode
![](https://coimages.sciencemuseumgroup.org.uk/449/882/large_thumbnail_smg00241017.jpg)
STC JK100C diode
![](https://coimages.sciencemuseumgroup.org.uk/448/978/large_thumbnail_smg00239809.jpg)
alloy junction diode
circa 1950
![](https://coimages.sciencemuseumgroup.org.uk/448/982/large_thumbnail_smg00239813.jpg)
diode kit
circa 1950
![](https://coimages.sciencemuseumgroup.org.uk/448/988/large_thumbnail_smg00239821.jpg)
veractor diodes type SVC11
circa 1950
![](https://coimages.sciencemuseumgroup.org.uk/448/985/large_thumbnail_smg00239818.jpg)
vx3282 and vx3289 mixer diodes
circa 1950
![](https://coimages.sciencemuseumgroup.org.uk/475/172/large_thumbnail_smg00243546.jpg)
Marconi Osram thermionic diode valve
1935
![](https://coimages.sciencemuseumgroup.org.uk/475/61/large_thumbnail_smg00243429.jpg)
Osram thermionic diode valve
1955
![](https://coimages.sciencemuseumgroup.org.uk/453/71/large_thumbnail_smg00261222.jpg)
Mullard Double Diode
![](https://coimages.sciencemuseumgroup.org.uk/455/190/large_thumbnail_smg00239352.jpg)
Special diode type GRD7
![](https://coimages.sciencemuseumgroup.org.uk/451/136/large_thumbnail_smg00239310.jpg)
Experimental cold-cathode diode
![](https://coimages.sciencemuseumgroup.org.uk/434/866/large_thumbnail_smg00155127.jpg)
VX 6102 modulator overswing diode
![](https://coimages.sciencemuseumgroup.org.uk/434/865/large_thumbnail_smg00155126.jpg)
VX 6122 modulator overswing diode
![](https://coimages.sciencemuseumgroup.org.uk/449/863/large_thumbnail_smg00240997.jpg)
Mullard silicon 4-layer diode BA148
![](https://coimages.sciencemuseumgroup.org.uk/439/408/large_thumbnail_smg00208125.jpg)
Germanium diode type GP5C
1953
![](https://coimages.sciencemuseumgroup.org.uk/448/987/large_thumbnail_smg00239820.jpg)
Q-band detector diode
circa 1950
![](https://coimages.sciencemuseumgroup.org.uk/448/983/large_thumbnail_smg00239814.jpg)
diode components
circa 1950
![](https://coimages.sciencemuseumgroup.org.uk/449/7/large_thumbnail_smg00239853.jpg)
Q-band detector diode
circa 1950
![](https://coimages.sciencemuseumgroup.org.uk/449/8/large_thumbnail_smg00239854.jpg)
mixer diode VX3352
circa 1950
![](https://coimages.sciencemuseumgroup.org.uk/449/5/large_thumbnail_smg00239850.jpg)
components for crystal diode
circa 1950
![](https://coimages.sciencemuseumgroup.org.uk/475/378/large_thumbnail_smg00243816.jpg)
Marconi thermionic diode valve
1915
Original Fleming diode (1904)
1904
NU5 diode
Commercial pattern Fleming Diode (Ediswan Make)
Large diode
circa 1950-circa 1970
Guard-ring diode apparatus by Unilab
1970-1979
Antique Diode
diodes CV2154
1950-1980
varactor diode
circa 1960