Let’s check out some of the vintage advertising below. To be fair, most tube testers that claim ‘operating conditions’ actually do have voltages similar to television and radio equipment of that era guitar amplifiers are a horse of quite a different color. Most Hickok advertising states that a tube is ‘tested under simulated operating conditions’, although I have never owned a Hickok that could put 500VDC on the plates of an E元4. Hickok really had quite a colorful history, and here we have but a very small sampling of the advertising/catalog inserts I could find. This model was replaced after the war years with the 530B, which thankfully had the roll chart, as well as sockets to test the ‘new’ miniature tubes. The 510X had the ‘drawback’ of having no room for a roll chart, thanks to the VOM function. Not quite what you thought it would be, is it? This model was manufactured up until approximately 1935, during which time most every model of tube tester was superseded by an ‘upgraded’ version, complete with a new model number. Hickok 510X is not as coveted as many other Hickok tube testers. A very early model (though certainly not the earliest model I’ve seen) is the 510X, which also doubles up as a VOM. Although they manufactured quite a large number of tube tester models (beginning in 1928!), today’s audio ‘experts’ seem to only covet the later models. ![]() Their name is held in the highest esteem, and Hickok tube testers are very much sought after today. The number one name in vintage tube testers is Hickok, without any doubt.
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