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A68JMT50X is the early one, without a built-in radiation shield (uses an external one) A68KZJ50X is the update, and it has one built in, but for the sake of a place to mount the degaussing coils, you can keep the external shield in place. The KV-27TS27 had the KZJ originally, but I can't remember whether the 27TS32 did as well. The model number being larger isn't necessarily newer, and I can't remember which board & tube the 27TS32 had.
Not to be negative, but I am 100% prejudiced against ANY rebuilt Sony 27" tubes. They never converge right, and there is always a purity blotch.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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