Hivac valve, type PX 230, grid pin missing, (RMW/D82 - McVitie Weston number), made by Hivac Limited, aka the High Vacuum Valve Company, London.
Hivac valve, type PX 230, grid pin missing, (RMW/D82 - McVitie Weston number), made by Hivac Limited, aka the High Vacuum Valve Company, London.