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75 ohms AC line AC operated adjustment Ampex amplifier audio signal basic battery charger beam broadcast brushes called cause chamois circuits cleaning co-axial cable components composite video condensor connected control track degausser drive pulses drum assembly EIAJ electron gun erase head focus frequency hardware high voltage impedance input integrated circuit lens mount line level magnetic maintenance procedures meter mixer modulator monitor screen multi-meter necessary ohms original tape oscilloscope output Panasonic PC board phillips head piece of equipment plastic playback VTR played back plug portable camera portable VTR problems Proc Amp receptacle record current record VTR replace RF modulator RF signal RF unit ring scan schematic screwdriver screws service manuals shield Sony speaker surface switch sync pulses sync signal transfer TV set UHF connector usually vertical sync video and audio video equipment video heads video signal video tape vidicon tube viewfinder VTR equipment wire