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I have seen a few that have developed H-K shorts where the heater has "welded" itself to the inside of the cathode nickle, and have been very difficult to remove without distorting/breaking... did this crt have a H-K short? Most of the heaters that I have seen after years of service look pretty much like the picture that I posted above, although they may "darken" somewhat over the life of the tube.
jr
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