![]() The tube must be heated in order to function. In these cases you can carefully check if the tube is hot or cold. There are some tubes that have their filaments well hidden making it nearly impossible to see. What matters is that it is glowing to some degree. In some tubes it’s more intense than others, but this is not a problem. ![]() First, every tube will have a heater filament that, when working, will cast a nice warm orange glow. There are a couple very obvious things to look for. But keep in mind the same issues will arise in hifi stereo tube amplifiers and preamplifiers so audiophiles will find this article useful too. We’ll go over some of the most common scenarios that a guitar player might find with his or her guitar amp. Well although not all tube problems can be found without a tester, many problems can be. You’re doing sound check before a gig, something sounds wacky, and now you’ve got to figure out what’s happening. We are often asked how to determine when a tube is bad without access to a tube tester.
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