I AM LOOKING FOR INFO ON JACKSON 648 TUBE TESTER AND DON'T KNOW WHERE TO LOOK OR WHO TO ASK. I WOULD LIKE TO FIND TEST DATA FOR TUBES LIKE 0A2, 0B2 ETC. I HAVE SEVERAL ADDITIONAL DATA SHEETS, BUT NOTHING ON THESE TYPE OF TUBES. DOES ANYONE KNOW IF IT IS AVAILABLE ANYWHERE. MURRAY