The Visual Study of Vacuum Tubes
Understanding how to perform the visual study of vacuum tubes can enable you to readily identify the unique characteristics and applications of a given tube.
The EICO 667 Vacuum Tube Tester
This guide explains how to use the EICO Model 667 Dynamic Conductance Tube and Transistor Tester to test vacuum tubes. It provides step-by-step instructions for testing a tube, including setting the knobs and sliders, inserting the tube, and conducting a merit test. The guide is intended for anyone who needs to test vacuum tubes and wants to ensure they follow the proper process to avoid damaging any tubes or their tester.