Electrohome-CHF142_515-tun-电气原理图手册

CHF142-515 AM-FM TUNERDUAL ANTENNA INPUTSAM-Low impedance loop supplied.Provision for connecting external antenna.FM-Folded dipole for built-in installation supplied.Provision for connecting external antenna.Antenna impedance 300 or 72 ohm.TUNED R.F.STAGEOn BC Band 535-1650 Ke.On FM Band 88-108 Me.SENSITIVITYAM -1 Microvolt or better for 1 volt outputFM-3 Mierovolts (average)for 30 db.quieting.SELECTIVITYAM -Sharp-6 Kc.wide at 5 db.downBroad-16 Ke.wide at 10 db.downFM-100 Ke.wide at 10 db.downFREQUENCY RESPONSE20to20,000cps±1db.DISTORTIONLess than 0.04%for 1 voltHUM LEVEL100 db.below 2 volts rated outputOUTPUT500 ohms Impedance out of cathode follower10 KC.FILTERBuilt-in.45 db.down at 10,000 eps.2 db.down at 5,000 cps.I.F.FREQUENCYAM-455 Kc.FM -10.7 McPOWER CONSUMPTION70 watts at 117 volts AC.25/60 CyeleSIZE WEIGHT7”High x14%”Wide x9%”Deep.171bs.CONTROLS1.AC Off-On Switeh2.Volume ControlSelector Switch-Broad AM,Sharp AM,FM and FM AFC4TuningTUBE COMPLEMENT(2)6BQ7AFM RF Amplifier.FM Oscillator and A.F.C.Control.(1)6CB6FM Converter.(3)6BA6FM Ist and 2nd I.F.AM R.F.Amplifier.(1)6BE6AM Converter(2)6AU6FM 1st 2nd Limiter(2)6AL5FM Diseriminator.AM 2nd Detector and AVC.(1)6E5Tuning Eye(1)12AU7Voltage Amplifier Cathode Follower Output(1)5Y8GTRectifierSPECIAL FEATURESExtremely sensitive cascoded FM RF stage.Continuously variable A.F.C.threshold control.Channel indicator pilot lights.Flywheel tuning.Tuning eye.All values shown are nominal.