I purchase a Heathkit 0-8 oscilloscope in a Goodwill auction. I have the parts list and schematics for both 0-8 and 0-9 and the manual. The scope is in fair shape for its age. When I opened it up and started looking at the schematic. I had 2 extra tubes, that were not shown on either 0-8 or 0-9 paperwork. After some digging, I found out it was an aftermarket kit that added 2 voltage regulator tubes. My question is does anyone have a copy of the schematic and information on this add on. The problem was corrected in the 0-9 which I saw when I looked at them side by side. Thank you for your time.
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