778 Sixteen-Channel Variable Gain Preamplifier



The Model 778 is a high performance, variable gain preamplifier with 16 channels in a single width NIM module. It is designed to operate with photomultiplier detectors producing negative output pulses from DC to over 200 MHz. Each channel has a 50 ohm input, a front panel gain adjustment providing non-inverting voltage gains from two to fifty, an offset control, and two outputs.

Excellent stability for both DC and higher frequencies helps to maintain good pulse fidelity without significant pulse overshoot or baseline drift. The DC offset control can easily compensate for offsets due to variations in source impedance or differences in signal grounding.

The output stage is a low impedance voltage source design with short circuit protection. No damage can occur from overloading or continuous shorts to ground. Each output is capable of driving a 50 ohm load providing a fan-out of two for the amplified signal. However, unused outputs may be left unterminated with no adverse effects.

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