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Questions about tubes and gear that glows. FAQ

Simple to buy only tested tubes

In Europe on eBay you frequently see photos of the tube in question in the tube tester. Particularly in Germany vendors are good at recording actual test results. A lot of vendors have tube testers, and if they won't give youth results as a percentage of new it's up to you to buy or look elsewhere. "Tests good" only means 60% upwards, and 60% isn't great. You would usually be looking for 80% and above. And if you see a vendor with a tester (look at other tubes he's selling) saying "filaments good" it's a good bet he tested the tube and got a low result.

This doesn't address the question of rebranding tubes, but it addresses the question of whether you're getting a strong tube or not (80% or over). I'd prefer a reliably tested used tube to a "new" boxed tube. You can get all kinds of tubes in what looks like their original boxes.

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