I ran across this old OLSON tube tester at a flea market here. It came with a notebook with the settings for about ten different tubes. I had a 6AB6 and the settings for it, and the tester seemed to work ok. It would be nice to have a manual with settings for other tubes, plus some operating instructions, but I can't find a model number on it anywhere. Help Anybody ?? - 399 EDIT: I should have looked before posting. It is a model KB-92. Radio Museum has photos of a manual, but not source info.