Model AV-135B (2.5 GHz, 34 dB) The AV-130 series of AC-coupled miniature amplifiers is intended for amplifying nanosecond pulses and CW signals in the frequency range of 1.0 MHz to 4000 MHz.Models with the -PS suffix come in a larger bench-top instrument format, and operate from 100-240V, 50-60 Hz prime power.