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H I G H

D E F I N I T I O N

®

GS150

Stereo Power Amplifier

User Guide

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Summary of Contents for GS150

Page 1: ...H I G H D E F I N I T I O N GS150 Stereo Power Amplifier User Guide ...

Page 2: ......

Page 3: ...e eager to begin listening however please take a few minutes to read through this guide for useful information concerning the operation of your new amplifier Once installed please allow an appropriate break in period to fully appreciate the benefits this amplifier will provide to your system After reading the user guide if you have any further questions regarding your amplifier contact your dealer...

Page 4: ...ntrol 5 6 7 8 8 8 9 10 10 Operation Front Panel Controls and Displays Back Panel Controls and Connections Start Up Shut Down Cooling Fan Speed Adjustment Display Brightness Adjustment Hour Counter Auto Shut Off Break in Output Tube Bias Adjust 11 12 13 13 13 14 14 14 14 15 Maintenance Servicing Cleaning Disposal and Recycling Guidelines Warranty Specifications 16 16 16 17 18 ...

Page 5: ... a protective power ventilated cover While the cover may be removed its use is recommended to prevent accidental contact with the hot vacuum tubes The protective cover is also recommended to provide powered ventilation if the amplifier is mounted in shelving For continued protection against fire hazard replace the fuse only with the same type and rating as specified at the fuse holder The power bu...

Page 6: ...fficult to reach the included screwdriver will reach them as well as provide a magnetic tip to remove the screws Once all of the screws have been removed carefully lift the cover and detach the ventilation fan power plug located at the back of the unit cover Note that the plug has a screw type securing connector turn counter clockwise to loosen Installation After removing the top cover and the vac...

Page 7: ...rug or carpet Due to its weight this amplifier must be supported on a surface specifically rated for such a load Check with the manufacturer of your support system to be sure it is rated to handle this weight If the unit is to be operated in an enclosure such as an equipment rack make certain that adequate airflow above and to each side of the unit is provided The ambient operating temperature sho...

Page 8: ...ecomes increasingly important to avoid the limitations of inferior system interconnections It is important sonically that your entire system be connected so that the audio signal arriving at the speakers has correct or absolute polarity i e non inverted Connect the black or speaker terminal to the wire that connects to the 0 terminal on the GS150 Connect the red or speaker terminal to the wire tha...

Page 9: ...he loudspeakers Good operating practice dictates that the amplifier should be turned on last and turned off first in an audio system The GS150 uses a grounding system that does not require a ground lifter adapter plug on the A C power cord to minimize hum The power cord supplied with the GS150 has a standard grounding plug to provide maximum safety when properly connected to a grounded wall recept...

Page 10: ...2VDC signal at 12mA per GS150 for the duration of amplifier on time Do not use a momentary or data pulse control signal The 12VDC remote jacks have polarity protection so they will not operate if a 12VDC signal is accidentally connected or if the control wires are reversed RS 232 Control The GS150 has an RS 232 connector on the back panel in the event the amplifier is incorporated into an automate...

Page 11: ...11 Operation Left Channel Output Meter Right Channel Output Meter Voltage Meter Power On Off Display Brightness Bias Operate V1 V4 Bias Operate V5 V8 Front Panel Controls and Displays Power Indicator ...

Page 12: ...12 Operation Back Panel Controls and Connections side panel Bias Adjust V5 V8 side panel Bias Adjust V1 V4 Fan Speed Auto Shut Off Hour Counter RS 232 12 Volt Remote Turn On Ventilation Fans ...

Page 13: ...e cover of the GS150 has two low noise fans installed against the back panel to provide ventilation when the cover is installed on the amplifier Depending on your amplifier installation location you may wish to change the speed of the fans for adequate cooling As a guideline if the amplifier is sitting in the open with a minimum six inch clearance on all sides of the tube cover the low setting is ...

Page 14: ...d manner of usage of the amplifier Note Once the hour counter has been reset the total accumulated hours can not be recalled Operation Auto Shut Off The GS150 is equipped with an auto shut off feature designed to turn the amplifier off after a period of time during which it is not used The auto shut off feature is comprised of a signal sensing circuit designed to detect any incoming signals from y...

Page 15: ...corresponding to the V number selected with the Bias Operate knob Slowly turn the adjustment tool watching the front panel meter of the selected vacuum tube Continue to adjust the bias until the needle of the meter is within the bias area on the output meter see green area in illustration with the black Bias triangle on the meter being the center of the bias point Once you have made the adjustment...

Page 16: ...all 763 577 9700 You may also initiate a service request by visiting the Audio Research website www audioresearch com and selecting Service Repair at the top right of the home page Cleaning To maintain the new appearance of this amplifier occasionally wipe the front panel and top cover with a soft damp not wet cloth to remove dust A mild non alkaline soap solution may be used to remove fingerprint...

Page 17: ... the United States the authorized importing retailer or distributor has accepted the responsibility for warranty of Audio Research products sold by them The specific terms and remedies for fulfillment of the Limited Warranty may vary from country to country Warranty service should normally be obtained from the importing retailer or distributor from whom the product was purchased In the unlikely ev...

Page 18: ...y 2 0V RMS BAL for rated output 24 dB Bal gain into 8 ohms Input Impedance 300K ohms Balanced Output Polarity Non inverting Balanced input pin 2 IEC 268 Output Taps 8 ohms 4 ohms Overall Negative Feedback 14dB Slew Rate 13 volts microsecond Rise Time 2 0 microseconds Hum Noise Less than 0 1mV RMS 114dB below rated output IHF weighted input shorted Controls Rotary selector for tube bias Power on of...

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Page 20: ...014 Audio Research Corporation Reproduction of this document in part or whole is expressly forbidden without written consent from Audio Research Corporation H I G H D E F I N I T I O N 3900 Annapolis Lane North Plymouth MN 55447 www audioresearch com ...

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