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Hi--
I tried most of the above options....I cannot pull the horizontal output tube (is it above the 3CU3?). It has some sort of a round metal ring that locks it into place....I feel like I would break it if I tried any harder....but I did clean its cap. The 3CU3 glowed orange and/or blue....the back of the crt had some blue lighting up and the sounds of a CRT coming up, but nothing in the screen (pic does not show the blue).
I see a crack on the CRT as well. (see pic). I did not notice that before. I pulled out the cap a bit to investigate, but plugged it back in.
Sound was fine, no smoke or arcs.
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