Wireless valve, 7405A
Wireless valve, admiralty pattern 7405A made by the Mullard Radio Valve Company Limited, Mitcham in May 1940. Type NR16A. Tested at the H.M Signal School, Portsmouth.
Wireless valve, admiralty pattern 7405A made by the Mullard Radio Valve Company Limited, Mitcham in May 1940. Type NR16A. Tested at the H.M Signal School, Portsmouth.