McVitie Weston valve collection
- Made:
- United States and Canada
- maker:
- Mullard Limited
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LicenseMullard output triode valve, type D060, B4 base, serial no
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Mullard output triode valve, type D060, B4 base, serial no. 5565, marked 'ONYX', black moulded square 4-pin base, (RMW/D72 - McVitie Weston number), by Mullard Limited.
