We have developed a two-stage amplification system consisting of "in-line" preamplifiers and a second stage splitter amp. The system has a bandwidth that exceeds 1 GHz.

The preamplifiers are "in-line" in that the same coaxial cable is used to power them with a dc current and also carry the fast output signal. The preamps are assembled in a cylindrical structure with BNC connectors at either end.

The preamplifiers plug in directly into the base of photomultiplier tubes, as shown below.

The preamplifiers are powered by a second stage splitter amplifier that provides two outputs. The gains of the two outputs may be equalized or set in some fixed ratio. Shown below are two splitter amp boxes, each housing 8 channels. A DB-25 connector provides voltage outputs proportional to the anode current being drawn by each channel.