| Model | Description | Characteristics | Applications |
| A101 | Charge Sensitive Preamplifier & Discriminator | Sensitivity: 1x106 electrons; Variable threshold; TTL and open collector output; 4MHz periodic; Externally adjustable discrimination levels and pulse width | Pulse counting mode with: Photomultiplier tubes (PMT), Channel Electron Multipliers (CEM) |
| A111 A111F | Charge Sensitive Preamplifier & Discriminator | Sensitivity: 5x104 electrons; Variable threshold; TTL output; 2.5MHz periodic; Analog monitor output; Externally adjustable discrimination level | Pulse counting mode with: Low gain photomultiplier tubes, Proportional counters, and Microchannel plates (MCP) |
| A121 | 12MHz Preamplifier Discriminator | Sensitivity: 5x104 electrons; Voltage controlled threshold; 12MHz periodic; Analog monitor output; Adjustable pulse width | Fast pulse counting mode with: Microchannel plates, Channel Electron Multipliers, Low gain PMTs, Proportional counters, and Solid state detectors |
| A203 | Charge Sensitive Preamplifier & Shaper | Preamplifier: Noise 900 electrons RMS; Rise time 50ns Shaper: 300ns Peaking time; Sensitivity 5V/picocoulomb; Unipolar and bipolar outputs available | Analog Mode with: Solid state detectors, Proportional counters, Photomultiplier tubes, and Channel Electron Multipliers |
| A206 | Pulse Amplifier & Discriminator | Amplifier: 10x gain Discriminator: Sensitivity 50mV; 200kHz periodic; Externally adjustable low level discrimination levels and pulse width | To follow a pulse shaper (A203, A225) for 10x gain and provide low level discrimination |
| A225 A225F | Charge Sensitive Preamplifier & Shaper | Preamplifier: Noise <280 electrons RMS; Rise time 20ns Shaper: 2.5µs peaking time; Sensitivity 5V/picocoulomb | Analog mode with: Solid state detector and Proportional counters Will accept high capacitance detectors |
| A250 A250F A250F/NF | Charge Sensitive Preamplifier "State-Of-The-Art" | External FET to match detector characteristics, allows cooling of input FET; Rise time <2.5ns; Noise <100 electrons RMS at +20 °C, <20 electrons RMS with cooled FET | All possible detectors can be connected to the A250 since the input FET is external and sensitivity is variable. The A250 has been called "the best preamplifier in the world", because it can be adjusted by the user to perfectly match the detector characteristics, reduce noise, and maximize performance in every application. |
| A275 A275FC A275FN | Pulse Amplifier | Low noise (4nV/ÖHz); Ultra low power (15mW), High slew rate (100V/µs), Wide band (ft=200MHz); Differential input, configurable as a shaping amplifier with adjustable gain and time constants | Used for gain and shaping with the A250 or other charge preamps |
| A150 | Pulse Amplitude Discriminator | Tunnel diode snap action discriminator; Complementary CMOS outputs; 5MHz periodic; Externally adjustable discrimination level and pulse width | To follow a pulse shaper (A203, A225, A275) for accurate level discrimination |
| BLR1 | Baseline Restorer | Restores baseline in high counting rate applications | For use with the A275, A203, A225 |
| PH300 | Peak-Hold Detector | To hold the peak of the analog pulse and interface with Analog to Digital converters. Both Wilkinson type and successive approximation ADC can be accommodated; Low power (<30mW); Low droop rate (<1µV/祍); Fast analog rise time (200ns) | To be used with the A275, A225, A203 or any other pulse amplifier |
