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Update, I've discovered why this set had brightness issues, the 8BP4 has a G1 short in it.
I came to this conclusion after I tested a 7JP4 in the set, and the 7JP4 did allow the brightness to be turned all the way down, and there were no retrace lines. The focus was also improved.
So I tried the "remove G1 shorts" function on my Sencore CR70. It actually worked, for a few minutes. The picture was much better and I could adjust away the retrace lines and have good focus and contrast. But, after 3-5 minutes the brightness would jump back up in a couple quick steps and be back to the way it was.
I also noticed no spark during the remove short process on the CR70.
Is there anything else I can do? I tried the "extended" G1 short removal process in the Sencore manual but that actually did nothing. I also tried rotating and shaking the set around and tapping the neck of the CRT with no change...
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