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model 223 FEATURES ACCOMMODATES ALL SERIES STRING AND OTHER UP-TO-DATE TUBE TYPES: - 17 individual filament voltages from .75 to 110 volts. Tests all standard base types: 4-, 5-, 6-, 7-pin large, octal, loctal, 7-, 9-, and 10-pin miniature, and Spin nuvistor, novar and compactron. OPEN ELEMENT TESTS: - This special test supplements the primary Emission Test. 12 LEVER ELEMENT SELECTOR-DISTRIBUTION SYSTEM: - This important CONAR feature provides complete flexibility and anti-obsolescence assurance due to new tube basing terminations. THREE-COLUMN, TUBE ROLL CHART. INDEPENDENT FILAMENT TERMINAL SELECTION: - Locates terminals of all filaments (single, double, center-tapped) regardless of pin positions. This is possible only when 12 instead of the usual 10 levers are provided. FILAMENT CONTINUITY TESTS: - Rapidly shows up open filaments including open sections of tapped filaments. TESTS SPECIAL TUBES: - Tests special-purpose tubes and gas rectifier types such as 0Y4, 0Z3, 0Z4 and remote-control gaseous types such as 0A4. TESTS MULTI-SECTION TUBES: - Individual tests for each section of multi-section tubes (where required). Open-close "eye" tests of cathode ray indicator tubes. HOT CATHODE LEAKAGE TESTS: - Reliable, sensitive neon method shows up cathode leakage. INTER-ELEMENT SHORT TESTS: - Made universally simple through the use of the CONAR 12-lever element selector system. METER: - Large, easy-to-read, clear-plastic cased meter. Rugged, double-jeweled D’Arsonval type. LINE ADJUSTMENT: - Read directly on meter. Continuously variable, heavy-duty line-voltage control. TEST CIRCUITS COMPLETELY TRANSFORMER-ISOLATED FROM POWER LINE: - Assures utmost safety to operator and instrument. SEPARATE WINDING ON POWER TRANSFORMER FOR TEST VOLTAGE. Filament voltage taps are NOT used for test voltage supply.