McVitie Weston valve collection, Ediswan projection tube valve, type 20kV
Ediswan projection tube valve, type 20kV, hemispherical bulb 5.5in diam with 11.5in long x 1in diam glass neck, graphite internal screening, (RMW/K35 - McVitie Weston number), by Royal Ediswan, 1938.
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