Transmitting valve type TT4A, made by M-O Valve Company Limited, England, 1919-1922. Transfer logo on the valve reads "VALVE WRLESS TANSMITTING, PATT NO. 5199A, TT4A". On the reverse it reads "MANUFACTURED BY THE M.O. VALVE CO. LTD. MADE IN ENGLAND".
- Electronic Components
- Object Number:
- brass (copper, zinc alloy), glass, metal (unknown), plastic (unidentified), textile and wood (unidentified)
- thermionic valve
- component - object
- Donated by the M. O. Valve Company Limited
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