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That's supposed to be a cross hatch pattern on the 721. I tried the pattern on a 1962 Zenith I restored and it was perfect. Bob Andersen had a horizontal frequency/lock issue on his 721 on initial start up and was able to dial it in adjusting the frequency.slug and coil and messing with the lock trimmer. I'll need to try that out soon. The pattern on my screen is similar to what he got and was able to adjust to normal.
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