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Pub.  42004-374A 

GAI-TRONICS  3030 KUTZTOWN RD.  READING, PA  19605 USA

610-777-1374  

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  800-492-1212  

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  Fax:  610-796-5954 

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Model 370-202 Interface Amplifier 

Assembly for Electro-Sound 

Confidentiality Notice 

This manual is provided solely as an operational, installation, and maintenance guide and contains sensitive 
business and technical information that is confidential and proprietary to GAI-Tronics.  GAI-Tronics 
retains all intellectual property and other rights in or to the information contained herein, and such 
information may only be used in connection with the operation of your GAI-Tronics product or system.  
This manual may not be disclosed in any form, in whole or in part, directly or indirectly, to any third party. 

Introduction 

The Model 370-202 Interface Amplifier for Electro-Sound allows GAI-Tronics’ Page/Party

®

 systems to 

interface with GAI-Tronics’ Electro-Sound systems.  This unit interconnects two voice circuits that are 
dissimilar in voltage and/or impedance.  The interface amplifier is not just a matching transformer; it also 
includes a gain adjustment that compensates for differences in signal levels or permits use with a range of 
signal level.  It can also be used in other paging systems. 

Consisting of: 

Model 
No. 

Amplifier Enclosure 

370-202 371-202 

372A 

Installation 

WARNING

Do not install the Model 370-202 equipment in hazardous areas; such installation may cause a safety 
hazard and consequent injury or property damage. 

Enclosure Placement 

The Model 370-202 Interface Amplifier Assembly should be located near the Model 10456-001 
Electro-Sound power source and within 300 feet of the Model 305-001 Line Balance Assembly for the 
GAI-Tronics Page/Party

®

 system. 

Summary of Contents for 370-202

Page 1: ... or indirectly to any third party Introduction The Model 370 202 Interface Amplifier for Electro Sound allows GAI Tronics Page Party systems to interface with GAI Tronics Electro Sound systems This unit interconnects two voice circuits that are dissimilar in voltage and or impedance The interface amplifier is not just a matching transformer it also includes a gain adjustment that compensates for d...

Page 2: ...erfere with the plug in amplifier receptacle There are four 5 16 inch diameter mounting holes in the corners of the Model 372A Amplifier Enclosure See Figure 1 When mounting the enclosure use caution to avoid damaging the terminal blocks inside The suggested mounting height for all station enclosures is 54 inches 137 cm to the bottom of the enclosure Connect the conduit to the enclosure then feed ...

Page 3: ...g when no handset or headset is plugged in and another relay for switching between page and party lines The wiring shown in Figure 2 provides ac power to Model 471 Electro Sound Power Source Model 370 202 Interface Amplifier Assembly and Page Party wall stations The wiring to the interface shown in Figure 2 can be modified for two wire Electro Sound systems See the Electro Sound installation manua...

Page 4: ...004 374A Model 370 202 Interface Amplifier Assembly for Electro Sound Page 4 of 9 s_eng gtcproddocs standard ioms current release 42004 instr manuals 42004 374a doc 07 05 Figure 2 Page Party to Electro Sound ...

Page 5: ...he Page Party system 3 After system basic operation has been verified adjust the Model 370 202 Interface if necessary First establish communications between the Electro Sound system and the Page Party handset station nearest the interface Follow Sub steps A through C to complete the Model 370 202 adjustment Adjustments are made through the plugged access holes on the front cover A The Balance Cont...

Page 6: ...stem or central amplifier cut Jumper W 3 When the Model 370 202 is operated in a one way mode the BALANCE control will have no effect on operation When W 4 is cut only the LINE TO GTC control will be functional The GTC TO LINE potentiometer will be active if W 3 is cut Model370 202Applications In Figure 3 a Model 370 202 Interface allows the following options paging to be initiated by either a Pag...

Page 7: ...Pub 42004 374A Model 370 202 Interface Amplifier Assembly for Electro Sound Page 7 of 9 s_eng gtcproddocs standard ioms current release 42004 instr manuals 42004 374a doc 07 05 Figure 3 ...

Page 8: ...e line or a simple twisted pair of wires An interface to a central amplifier Maintenance The construction of the 371 Series Plug in Two way Amplifier allows replacement of either the printed circuit board assembly PCBA or two fuses without the need for soldering The Model 371 202 is used to interface Page Party systems to Electro Sound systems Replacement Parts Part No Description 371 202 372A 615...

Page 9: ...Hz Load impedance 33 ohms nominal Output source impedance 1000 ohms minimum Output level 1 5 VRMS nom with nom input Maximum output 1 9 VRMS with nom input Input level 0 78 VRMS nom 0 21 VRMS minimum Frequency response 250 4000 Hz 0 4dB Harmonic distortion 0 6 maximum Power Requirements 120 V ac 105 130 V ac 50 60 Hz 10 W 24 V dc 21 28 V dc 1 amp max Physical Characteristics Controls Gain control ...

Page 10: ... of the Contractor s personnel from the work site Re performance of services shall be Buyer s sole and exclusive remedy and in no event shall GAI Tronics warranty obligations with respect to services exceed 100 of the total cost of the services provided hereunder Warranty Periods Every claim by Buyer alleging a defect in the goods and or services provided hereunder shall be deemed waived unless su...

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