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A tube tester is an electronic instrument designed to test certain characteristics of vacuum tubes (thermionic valves). Tube testers evolved along with the vacuum tube to satisfy the demands of the time, and their evolution ended with the tube era.
EICO was established in New York City in 1945 by radio repair business owner Harry Ashley to manufacture electronic test equipment in kit form. His first product, advertised in the July 1946 Radio News, was the model 113 VTVM/audible signal tracer. [1]
Creates constant-amplitude variable frequency sine waves to test frequency response Transistor tester: Tests transistors Tube tester: Tests vacuum tubes (triode, tetrode etc.) Wattmeter: Measures power in a circuit Vectorscope: Displays the phase of the colors in color TV Video signal generator: Generates video signal for testing purposes Voltmeter
Later thermionic vacuum tubes, mostly miniature style, some with top cap connections for higher voltages. A vacuum tube, electron tube, [1] [2] [3] thermionic valve (British usage), or tube (North America) [4] is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.
When tube equipment was common, retailers such as drug stores had vacuum tube testers, and sold replacement tubes. Some Nixie tubes were also designed to use sockets. Throughout the tube era, as technology developed, sometimes differently in different parts of the world, many tube bases and sockets came into use.
Vintage Eico Electronic Tube Tester, Model 625, Circa 1950 - 1952: Date: 19 August 2014, 01:21: Source: Vintage Eico Electronic Tube Tester, Model 625, Circa 1950 - 1952:
Test bench; Test light; Test loop translator; Test probe; Time base generator; Time-domain reflectometer; Total harmonic distortion analyzer; Transformer ratio arm bridge; Transistor tester; Tube tester; Two-tone testing
The company also designed and made other electronic instruments such as signal generators, valve (vacuum tube) testers and valve characteristic meters and specialist equipment for radio servicing. Many of these were intended for both military and commercial use and were made to a very high standard.