Manufacturer, on tube: "...TYPE NUMBER ML-41PB/..THE MACHLETT LABORATORIES INC. MADE IN U.S.A.".

Note: See 96/269/242-2 for manufacturer details and image of the rectifying valve 'ML-41'. This tube is manufactured by Machlett X-ray Tubes (Great Britain) Ltd., the sister company of Machlett Laboratories Inc. USA. The only difference between the valves are the type codes issued by the companies: 'ML-41PB' (USA); ML-41 (Great Britain).

Alfred Hospital.
Alfred Hospital, then donated by Joan Prior to the Radiology Collection stored in basement of PANCH Hospital.

Rectifying valve for X-ray equipment, glass/metal, Machlett Laboratories, USA, 1940-1960.
(-1) Rectifying valve type ML-41PB, No. 89512.
(-2) Information sheet issued by Machlett X-ray Tubes (Great Britain) Ltd., on the 'ML-41' Rectifying valve.

Made: Machlett Laboratories Inc.; 1940 - 1960

Manufacturer and type, on valve, printed sticker: "X-RAY VALVE TUBE/ TYPE NUMBER ML-41PB/ MAXIMUM PKV 140/ FILAMENT VOLTS 6.0/ SERIAL NO. STAMPED ON CATHODE/ THE MACHLETT LABORATORIES INC. MADE IN U.S.A.".
Manufacture type, engraved on cathode: "89512"

96/269/131

1940 - 1960