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being as there is practically no load on the focus grid, I am not suprized about the zenith. This is a little different as the resistors are not in series with the focus pin, but are connected from the focus tube cathode to the ground. Anyway I will see if it makes any difference after I get the correct fuse. I will also do a quick B+ current check just to see if in spec. Will be easy to do since the fuse clips are on the top of the chassis along with the PS diodes. Does not pay to stick you hand back around that.... there is even a tube shield about 1/4" away from the 385v B+.
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