ElectroVoice-A15CL-int-电气原理图手册

ElechoyoiceSpecifications andInstructionsELECTRO-VOICE.INC.Model A15CL Lowboy AmplifierBUCHANAN,MICHIGAN15-watt Circlotron High-FidelityAmplifier with ControlsGENERAL DESCRIPTION-The Electro-Voice Model A15CL is a lowboy styled,self-powered preamplifier,amplifier and music control center for use with ultra-linear ceramic phonograph cartridges,crystal phonograph cartridges,low and bigh-level magnetic phonograph cartridges,tuner,television,and tape reproducers.The A15CL is designed with a basic modular height and thus may be stacked inequal height with the Electro-Voice Model A20CL lowboy amplifier and Models3305 and 3306 lowboy tuners or double stacked to match Models 3303 and 33047stereophonic tuners.The brushed-brass and rich brown baked enamel finish pre-Specificationssents an attractive appearance which will blend with contemporary room decors.FEATURES-The Model A15CL power amplifier employs the new Wiggins Circlo-tron circuit.DC output current is removed from the output transformer throughthe use of a bridge circuit.All switching transients are eliminated through unitycoupling between output tubes.The primary impedance of the output trans-former is one quarter of that found in conventional amplifier output circuits,allowing an increase in power output at extremes of the frequency spectrum:Fig.1-Model A15CL Lowboy AmplifierA damping factor control permits perfect coupling between the amplifier andloudspeaker system eliminating the usual loss of bass from overdamping or hang.Instructionsover due to underdamping.For the first time,through the use of this control,optimum operation of any speaker system is assured.The music control center of the A15CL has available a number of fixed and vari-able frequency response curves.Many features of this unit have been patternedafter precepts laid down in the design of professional equipment.The phono-equalizer switch is effective on both the magnetic and ceramic (high-0impedance)phono channels.A recording signal,available at the record outputjack,is affected by the equalizer circuits,but not the volume and responseELECTRvarying controls.62015SPECIFICATIONS10Power Output:15 watts rated,30 watts on peaksSee Fig.2"Maximum Undistorted Power vs.原201001,00010,000100.000Frequency"FREQUENCY IN C.P.S.Frequency Response:1.5 db 20 to 20,000 cps at rated outputModelSee Fig.3 "Frequency Response"Fig.2-Maximum Undistorted PowerHarmonic Distortion:vs.FrequencyLess than 0.5%at rated outputIntermodulation Distortion:Less than 1.2%at rated outputA15CLSee Fig.4"Power vs.IntermodulationDistortion"Hum and Noise:75 db below rated output at maximumLowboyvolume setting60 db below rated output through magneticpreamplifierAmplifierSpeaker Output:4 ohms,8 ohms,16 ohmsRecord Output:0.5 V RMS rated,3 V RMS,max.fromRECORD OUT jack10Record Output Imp.:50K ohms(to work into 250K ohms minimumload)Feedback:1,0010,000Loop feedback:15 db negative2 db positiveFREQUENCY IN C.P.SDrive plate:Output circuit:25 db negativeFig.3-Frequency Response a