Dynamic Output Tube Tester
Jackson Electrical Instruments Co
Dayton, Ohio, U.S.
||6175 stamped near hinges inside of case.
||637-4 Form # located in lower right of form attached to lid.
overall: 6 x 14.75 x 15
Object consists of tube tester, one jumper cable, 4 loose probes, Sylvian Electronic Products tube type chart, JFD tube list, tube tester instructions and ballast tube types chart.