Abbingdon Music Research Dual Mono Pre-Main Amplifier AM-77 Owner's Manual
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Contents
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545b. ‘HiFi/Pro’ Switches for Balanced XLR inputsFor the majority of sources, the HiFi/Pro switch (R3) is best left in the ‘HiFi’ position. However, if the source hasa pro-audio style transformer balanced output, the HiFi/Pro switch needs to be set to ‘Pro’.A transformer balanced output uses a floating secondary from an audio transformer: unlike electronic balancedoutputs of any description, the signal is NOT referenced to ground (Pin 1). For such (rather rare) equipment, the‘Pro’ switch is engaged to short-scircuit Pins 1 & 3, thus establishing the ground connection.‘Pro’ switch is forthe few pre-amplifiers thathave floatingtransformerbalanced outputsHiFi ProModeIntAmpPowerAmpL RMPowerOn OffSyncBalancedInputDesigned and Engineered in Great BritainDual Mono Amplifier AM 77-++ __90V 135V190V 260V～ AC INSpeakerOutputSpeakerOutputLRIR LinkLR1 5432InputsNo User Serviceable Components Inside.,..For service contact your AuthorisedDealer or Distributor Any modifications tothis equipment will void all warrantiesCAUTION ATTENTIONRISK OF ELECTRIC SHOCKDO NOT OPENRISQUE DE CHOC ELECTRIQUENE PAS OUVRIR!,( ) ..Under normal operation set all switches tothe default position Please refer tothe instruction manual for further detailsboldHiFi ProModeIntAmpPowerAmp-OptionSERIAL NO.L R M MIn OutAM 77-AM 77-MM M |
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