All of Tennelec’s high-purity germanium detectors contain state-of-the-art charge sensitive, cooled FET preamplifiers. The preamplifier and high-voltage fitler network are encapsulated in the Uniline cryostat shroud. A temperature sensing circuit monitors the detector element and protects against warm-up damage by disabling the high-voltage. LEDs provide indications for high temperature and high count rate conditions. An exclusive cable pack insures compatibility with other manufacturers amplifiers yet eliminates the need for seperate signal and test pulser cables when used with a Tennelec amplifier.