A low-level DC amplifier using solion tetrodes

AMPLIFIERS FOR LOW-LEVEL dc signals must generally be chopper stabilized because of the drift associated with transistors and vacuum tubes. A new amplifying element, the solion tetrode, has been Pound to have drift, noise, semiconductors and vacuum tubes. DC amplifiers built and .temperature characteristics superior to those of both less expensive, and consume less power than chopper with solion tetrodes can achieve high performance, are amplifiers.