The 9526B is a photomultiplier tube that is clearly unused as it it sealed in a thick polythene bag. The tube is supplied complete with the special 14 pin base.
The sensitivity of this particular tube are listed on the attached label that is sealed into the bag with the tube.
On the box that in arrived in is the extra information that the tube has a quartz front window and that it is UV sensitive to 165 nm these are high energy UVC wavelengths.
The photocathode window.
The base and leads to the dynode secondary emission amplifier electrodes.
The end window envelope is 29 mm in diameter, and excluding the base pins is 111 mm tall.
Updated April 16, 2013.