![](https://coimages.sciencemuseumgroup.org.uk/50/675/large_thumbnail_1972_0141_0248__0002_.jpg)
Mazda 1R5 heptode valve, 1933-1966
- Made:
- 1933-1966 in Ponders End
![Mazda heptode frequency changer valve, type 1R5](https://coimages.sciencemuseumgroup.org.uk/50/672/small_thumbnail_1966_0125__0001_.jpg)
![Mazda heptode frequency changer valve, type 1R5](https://coimages.sciencemuseumgroup.org.uk/50/673/small_thumbnail_1966_0125__0002_.jpg)
Mazda heptode frequency changer valve, type 1R5, made by Edison & Swan United Electric Light Company, Ponders End, London, England, 1933-1966
Details
- Category:
- Electronic Components
- Object Number:
- 1966-125
- Materials:
- plastic (unidentified), metal (unknown) and glass
- Measurements:
-
overall: 55 mm x 25 mm x 25 mm,
- type:
- thermionic valve
- credit:
- From the Ministry of Supply