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Vintage is the way to go if your working in tube stuff, you need to test them at high voltage. The heathkit c2 and c3 are good, and the later it-11 and it-28 are even better. Like any vintage gear, they will probably need new caps too, but they are pretty simple devices and you can find manuals online. EICO, knight, and many other companies made testers that are almost identical. Also nice to have a modern digital Multimeter to double check values.
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