A.H. Systems' Preamplifier
line is an excellent choice with a rugged design, no hassles with
soldering your own power leads and they improve overall system
sensitivity by at least 20 dB. All of A.H. Systems' Preamplifiers
come with a 12-volt (or 15-volt) DC regulated power source. A low
voltage indicator confidently allows you to power the amplifier
with your own external 12-volt DC battery. This makes it a convenient
choice for field measurements. See table below for amplifier specifications.