The Attic

Models 910, 912, 914, 915, 920, 922, 954 Dynamic Electronometer (tube tester) (21 pages, 66MB, April 1940) - a five-part instruction manual that has sections for the following:

• operational features - applies to models 920 and 922 only
• tube test instructions - applies to all the models
• multi-test instructions - applies to models 920 and 922 only
• battery test instructions - applies to models 912, 914, 915, 920, 922, 954 only
• reference section, including a schematic diagram, decibel conversion chart, and supplemental tube test information chart - applies to models 920 and 922 only