McVitie Weston valve collection
- Made:
- circa 1930
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LicenseMicromesh output triode valve, type PA1, B4 base
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Micromesh output triode valve, type PA1, B4 base, pinch marked 3, central pin clipped, (RMW/Y364B - McVitie Weston number), by Standard Telephones and Cables Limited, c.1930.
