779 Thirty-Two Channel Photomultiplier Preamplifier



The Model 779 is a 32 channel preamplifier packaged in a single width NIM module. Each channel has a non-inverting voltage gain of 10 and operates from DC to over 275 MHz, with one output capable of driving two 50 ohm loads per amplifier. It is designed for use with photomultiplier detectors having negatively going output pulses. Both the input and output stages are protected for reliable operation.

This amplifier exhibits excellent DC and high frequency stability. Two channels can be cascaded to obtain voltage gains of 100, while maintaining good pulse fidelity without significant overshoot or baseline drift. Each channel has an internal DC offset adjustment allowing for compensation of the DC output due to variations of input source impedance or grounding differences.

The output stage is a low-impedance voltage source design with short-circuit protection. No damage will occur from overloading or continuous shorts to ground. Front panel space limitations allow for only one output connector, however each output is capable of driving two 50 ohm loads.

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