The 14 level and 12 level PMT suitable for standard 20 pin sockets are excellent pulse fidelity for high pulse current, fast timing applications, and energy measurement under various signal currents. They are very suitable for single photon counting. The ORTEC269 photomultiplier tube base structure is a mechanical component and resistive voltage divider with corresponding capacitive decoupling function, suitable for 14 level and 12 level PMT of standard 20 pin sockets