Once upon a time, there was a junked out HP-564 Storage Oscilloscope...in my salvage yard :-) Once the crème de la crème, it now sat, dirty, broken, and forgotten. It had an open hv transformer winding, problems in the timebase module, missing the screen graticule, bad tubes, etc.
I had a junker RCA WO-78 scope, had picked up flea market HP input and timing modules for that mainframe, and had a junk HP-561 mainframe. It was time...
I was able to hack the old WO-78 HV transformer in, used the 561 graticule to fix the crt face, used parts from the spare modules to repair the originals, and the 561 had the needed mainframe parts. A few new tubes, a fresh calibration, and the 564 was back to its former glory. I love boatanchors!!
