PMT amps
Two 20-MH¥amplifier discriminators are available for use with photomultiplier tubes in fast-photon-counting systems or scintillation counting applications. The devices provide a TTL output pulse. Pulse-pair resolution is 20 ns, allowing the devices to work over a dynamic range of five decades. The research-oriented AD6 is housed in a screened diecast box, and the discriminator threshold is factory preset to -2 mV. The AD7 is housed in a tin-plated steel enclosure that mounts onto a printed-circuit board, and the discriminator threshold can be adjusted from -2 to -5 mV.
Electron Tubes Ltd., Ruislip, Middlesex, England