This Part Name is 9956B.
This is Semiconductor.
This product has 52 mm Diameter functions.
Manufacturers of the product is Electron Tubes
Image and pinout :
Some of the text files within the PDF file :
These photomultipliers have low background windows.
Quartz (fused silica) windows are also avaiable as an option. Most are available in hard pin, flying lead with temporary B14A cap or permanent B14A cap options
This photomultiplier is an earlier type for scintillation counting. [ ... ]