McVitie Weston valve collection, Ediswan projection tube valve, type 20kV
- Made:
- 1938
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.