McVitie Weston valve collection
- Made:
- 1929 in United States and Canada
- maker:
- Mullard Limited
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LicenseMullard output triode valve, type DFA7, B4 base, marked 1207
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Mullard output triode valve, type DFA7, B4 base, marked 1207, (RMW/D59 - McVitie Weston number), by Mullard Limited, 1929.
