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If you later run into issues , its good to test the tube in that stage, or swap another tube in if you have one. One reason i use my tube tester is when i buy something off ebay, sometimes tubes develop shorts from being bumped in shipment, so I will usually run the tubes past my checker mainly to look for shorts, and weed out some weak ones as a side benefit. Radios and hifi rarely run the tubes hard, and often seem to work fine with rather weak tubes. Many TV circuits seem to be less forgiving of tubes, and may need a strong tube to work best.
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