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That tripler crosses to a ECG559 or NTE559. An NTE distributer should have it.
Yes, you can discharge the CRT by shorting the anode connection to the dag ground. You might want to attach a wire to an insulated screwdriver and connect the other end of the wire to dag ground. Holding the screwdriver by the handle, slip the end under the anode cup. You may hear a loud POP as the CRT discharges. Repeat this procedure several times to make sure all the charge is gone.
If you get a CRT tester, try to get a B&K model 467 or later model number. The older ones usually do not have the socket to test the inline tube like what is in your set and their rejuvenate function is not that great. A Sencore CR70 is another good choice. Like you said, the ones on epay are usually untested and you could easily wind up spending big $ on a piece of junk. Someone on this forum may have something they would sell you that would stand a much better chance of working than that crap on epay.
Maybe someone here on AK with a CRT tester is close to you (I'm in MS) and could check your tube. Another option is to find an older TV shop that could check your tube. Most of the newer shops would laugh in your face and tell you to s**tcan it if you brought that set to them. But, I'm here to tell you that your Zenith is far better than most any TV made today!
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