We’re bringing you a quality tube this #TechTuesday ...

Red catalog with a black and white illustration of a Sonatron vacuum tube.

We’re bringing you a quality tube this #TechTuesday. This pamphlet advertised vacuum tubes from the Sonatron Tube Company.

Tubes like these were a crucial component in radios, televisions, and other electronic devices in the first half of the twentieth century. Prior to the development of semiconductor devices like diodes and transistors, vacuum tubes were needed to control the flow of electric current between electrodes.

This pamphlet is undated, but was probably published around 1926. It is Trade Cat .S698 19—in Hagley Library’s trade catalog collection.