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You'd be better to get a real tester so you can read the condition of the tube on the meter. You don't want to rejuv a good tube! You'll actually make it worse and/or decrease it's life. Rejuvenation not only removes the trash; it removes some of the cathode coating that emits electrons. On a good tube; there is obviously minimal gunk on the cathode. Rejuvenating such a tube will remove the material that emits electrons from the cathode. You can probably pick up a quality tester on epay for $50 or less if you play your cards right.
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