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A.C. voltage A.F. oscillator adaptor adjusted aerial amplifier analyzer anode circuit anode current armature arrangement attenuator battery bias bridge calibration capacity cathode chassis checked components connected continuity tester current flowing curve cycles decibels deflecting plates diode electrodes emission employed example fault filament frequency modulator full scale give grid circuit grid leak harmonics heater I.F. circuits impedance inductance injected instrument insulation kc/s leakage load loudspeaker magnet mains maximum measurements meter needle method metres milliammeter moving coil meter mutual conductance negative obtained Ohm's Law ohmmeter ohms operation oscillator circuit oscillograph output meter pentode plug pole position potential potentiometer radio range reading receiver rectifier screening grid sensitivity series resistance Service Oscillator short shown in Fig shunt simple sockets suitable thyratron trace transformer trimmer triode tube tuning indicator valve tester valve voltmeter valveholder voltage volts waveform wavelength winding wire zero