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aerial amplitude anode anode circuit anode current anode voltage audio frequency capacitance coupling capacitor cathode coil component constant conversion conductance coupled circuits damping decreases detection detector diode distortion dynamic resistance earth effect electrons equivalent expression feedback feeder frequency changer frequency modulation grid bias grid circuit grid current grid input harmonic response hexode horizontal IaEa IaEg IaEg characteristic increased input admittance interference intermediate frequency kc/s LC circuit maximum Mc/s minimum modulation envelope mutual inductance negative obtained oscillator frequency oscillator voltage output voltage parallel pass-band pentode positive produced r.f. amplifier ratio reactance receiver reduced resonant screen secondary Section series capacitance short wave range shown in Fig shunt capacitance signal and oscillator signal circuit signal frequency signal grid signal voltage suppressor grid terminal impedance tuned circuit tuning capacitance tuning frequency tuning range undesired signal valve variable vector vertical volts wire Wireless Engineer zero