Echophone_EC-1_维修维护电器原理图手册_使用说明书手册

ECHOPHONE RADIO CORPORATION201 East Twenty-Sixth StreetChicago,U.S.A.INSTRUCTIONS FOR INSTALLATION,OPERATION AND SERVICEMODEL EC 1Echophone Commercial6 TUBEAC-DCTHREE BAND545KC-30.5MCRADIO RECEIVERInstalling The RadioIMPORTANT:This receiver,unless otherwise marked,must be operated from 115-125 volte -50/60cyeles-Alternating Current,or the same D.C.voltage.If you are in doubt,phone your electriclight company.Be sure all tubes are in their sockets before inserting plug in receptacle.If theset does not operate in one minute when connected to direct current,reverse the power plug in thereceptacle.DO NOT remove the chassis from the cabinet without first removing the power plug fromthe light aocket.ANTENNA:This receiver will require a piece of wire connected to A-1 terminal of the antenna term-inal strip appearing on the rear apron of the receiver's chassis.Very satisfactory operation ofthe receiver throughout its 3 band tuning range will be secured by using an outside antenna approx-imately 50 to 75 feet long including leadin.This antenna should be erected as high as possibleand removed from surrounding objects.Be sure the antenna is insulated from the ground at allpoints.For minimum interference it should be at right angles to street car lines,power lines andother electrical apparatus in the vicinity.When using this type of antenna the jumper between A2and G terminals should remain connected.A doublet antenna can be used and should be connected toterminals Al -A2.The jumper can remain connected between A2 and G or removed depending upon itsfavorable effect on reception.A ground can be connected to the G terminal and should be used onlywhen it materially improves the operation of the receiver.TUBES:The Model EC-1 receiver is shipped from the factory with the tubes in their proper sockets.The types of tubes required and the position of these tubes are clearly shown in the top chassisdrawing.Each tube has the type number stamped on it.Should it be necessary to replace any tubes