HP 8568B 1.5 GHz Spectrum Analyzer Repair

Our HP 8568B 1.5GHz Spectrum Analyzer is broken again (we first repaired it 8 years ago!). The CRT display has gone bonkers. And its unusual Lithium Thionyl battery needs to be changed, followed by a recalibration. Let's fix all this.

Previous "YTO Unlock" repair series from 8 years ago: https://youtube.com/playlist?list=PL-_93BVApb5_cuWe_NmRpuYJISmqlQt4Z

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