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An RCA self-service tube tester on display at the Oklahoma History Center. From the late 1920s until the early 1970s, many department stores, drug stores and grocery stores in the U.S. had self-service tube-vending displays. They typically consisted of a tube tester atop a locked cabinet of tubes, with a flip chart of instructions.
Front View of 7JP4 Electrostatic Television Picture Tube. The 7JP4 is an early black and white or monochrome cathode-ray tube (also called picture tube and kinescope). It was a popular type used in late 1940s low cost and small table model televisions. The 7JP4 has a 7" diameter round screen which was often partially masked.
An aside, as have been a repair tech, (not much with tubes) but from older tech I worked with, tube testers were a joke; that had the purpose to sell tubes. The good tubes would test as bad, and if you tested the new ones they would test bad. And full-fill pointless corporate diagnostic protocols (following steps even after its known to be bad).
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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.
In April 1976, the National Enterprise Board bought a 43% stake in Sinclair Radionics for £650,000, and in October the National Research and Development Council agreed to provide £1 million for a revived portable TV project, which was finally launched in January 1977 as the Microvision TV1A and MON1A at £99.95. Supply exceeded demand, and ...
Tube Testers- Use air pressure or vacuum to test for leaks, cracks, and material failures in a tube. Both manual activated and air activated models are available. To test for leaks in tubes, two operators are required with an operator at each end of the vessel. Step 1 - Seal the tube at both ends. Step 2 - Build air pressure or vacuum in the tube.
Eagle Test Systems was founded by Len Foxman and began providing test solutions in 1976. Since October 1, 2003, they have delivered over 600 test systems to more than 60 customers worldwide. Prior to being acquired by Teradyne, global headquarters were located at its manufacturing facility in Buffalo Grove, Illinois. There, Eagle Test Systems ...