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Introduction Superheterodyne Receivers
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AC DC receivers AC/DC adjustment alignment ampliﬁer antenna audio audio frequencies auto radio battery bias by-pass condenser cathode cause chassis common negative conﬁrm connected control grid converter tube coupling defective denser diagram dial direct current ﬁeld coil ﬁlament ﬁlter condenser ﬁrst AF stage ﬂow function ground heater input intermediate frequency lead loop megacycles noise ohmmeter ohms operation oscillator coil output meter output transformer padder pentagrid converter pickup plate circuit position power supply primary push-pull receiver of Fig rectiﬁer tube replacement resistance resistor response RF stage screen voltage screw second AF stage second AF tube serviceman shield short shown in Fig signal check signal-generator standard circuit standard output station substitution box superheterodyne receiver switch terminal test signal three-way portable trimmer Troubles common tuning circuit tuning condenser usually vibrator voice coil voltage check voltmeter volts volume control VVhen wave trap winding wire