Submarine repeater pentode P.O. type 8P, made by the Post Office, England, 1950-1970.
Valves used in submarine telephone cables need to be very long lasting, due to the effort and cost involved in retrieving a cable from the seabed in order to replace one.
- Science Museum, Information Age Gallery: Exchange
- Electronic Components
- Object Number:
- thermionic valve
- component - object
- Donated by the Post Office Research Department
- Permanent collection
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