Specifications

PERFORMANCE

BLEEDER RESISTANCE 1.5 MW total, tapped to provide proportional bias steps to successive tube elements.

CONTROL

FOCUS The voltage to the focus electrode in the tube is available as an external trim adjustment using a screwdriver potentiometer.

INPUTS

POS HV SHV connector accepts positive bias voltage to 2.5 kV maximum.

PMT SOCKET TRW 3B14. Fits JEDEC B14-38 PMT pin base (see Fig. 1).

OUTPUTS

ANODE  BNC connector provides negative linear output through Z_o ~ 1.1 MW, capacitively-coupled.

DYNODE  BNC connector provides positive linear output from the tenth dynode through 1.1 MW, capacitively-coupled.

ELECTRICAL AND MECHANICAL

WEIGHT
Net  0.37 kg (0.81 lb)
Shipping  0.96 kg (2.12 lb)

DIMENSIONS  5.6 cm (2.2 in.) diameter x 10.2 cm (4 in.) long.

RELATED EQUIPMENT

Either the anode or dynode signal may be processed through an ORTEC Model 113 Scintillation Preamplifier that is connected to a main shaping amplifier such as the ORTEC Models 460, 570, 572A, 575A, or 590A. These signals may also be connected through 50-W coaxial cables and amplified by fast amplifiers to be used in timing applications with the ORTEC Model 473A Constant-Fraction Discriminator or other fast discriminators. If one of the outputs is not used, it should be terminated with a C-27 100 W terminator to prevent distortion on the other outputs. The ORTEC Model 556 High-Voltage Power Supply is recommended for supplying the positive high voltage. A C-24-1 Cable is recommended for connecting the dynode output to a Model 113 Preamplifier. A C-24-12 Cable can be used between the preamplifier output and the input to the main shaping amplifier. For timing from the anode use a C-25-12 Cable. The C-36-12 Cable is recommended for the high voltage connection.

Table 1.  Compatible Photomultiplier Tubes

Fig. 1   JEDEC B14-38 PMT Pin Base with Pin Assignments:

Fig 2.  Simplified Schematic Diagram for the ORTEC Model 266 Photomultiplier Base.

ORDERING INFORMATION