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Those things make much better collectibles/display items than they do tube testers. They were only basic emission testers, and many were reportedly "biased" to read low, to help encourage replacement tube sales.
One would make a great addition to a TV display room (especially is it has all the lighted signage, etc.), but if you really want to test tubes, you would be better served with something like a military TV-7 (older tubes) or a B&K 747 (newer tubes).
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