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9   

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  fingerprints  or  similar  smudges. 
Cleaners  containing  abrasives  should  not 
be used as they will damage the anodized 
finish  of  the  front  panel.  A  small,  soft 
paintbrush  is  effective  in  removing  dust 
from bevels, the recessed nameplate and 
other features of the front panel. 
 

 
 
 
 
 
 
 
 

 

Disposal and Recycling 

Guidelines 

To  dispose  of  this  electronic  product,  do 
not  place  in  landfill.    In  accordance  with 
the  European  Union  Waste  Electrical  and 
Electronic  Equipment  (WEEE)  directive 
effective  August  2005,  this  product  may 
contain  regulated  materials  which  upon 
disposal  require  special  reuse  and 
recycling processing.   
Please  contact  your  dealer  or  importing 
distributor  for  instructions  on  proper 
disposal of this product in your country. Or, 
contact  Audio  Research  Corporation 
(763.577.9700)  for  the  name  of  your 
importing  distributor  and  how  to  contact 
them. Packing and shipping materials may 
be disposed of in a normal manner. 

Limited Warranty 

Audio  Research  Corporation  products  are 
covered by a 3-Year Limited Warranty or a 
90-Day  Limited  Warranty  (vacuum  tubes). 
This  Limited  Warranty  initiates  from  the 
date  of  purchase,  and  is  limited  to  the 
original  purchaser,  or  in  the  case  of 
demonstration  equipment,  limited  to  the 
balance  of  warranty  remaining  after 
original shipment to the retailer or importer. 
In  the  United  States,  the  specific  terms, 
conditions  and  remedies  for  fulfillment  of 
this  Limited  Warranty  are  listed  on  the 
warranty card accompanying the product 
in its shipping carton, or may be obtained 
from  the  authorized  retailer  or  from  the 
Audio 
Research  Customer  Service  Department. 
Outside  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 event that technical service 
beyond  the  ability  of  the  importer  is 
required,  Audio  Research  will  fulfill  the 
terms  and  conditions  of  the  Limited 
Warranty.  Such  product  must  be  returned 
at  the  purchaser's  expense  to  the  Audio 
Research factory, along with a photocopy 
of  the  dated  purchase  receipt  for  the 
product,  a  written  description  of  the 
problem(s) 

encountered, 

and 

any 

information  necessary  for  return  shipment. 
The  cost  of  return  shipment  is  the 
responsibility of the purchaser. 
 

 
 
 

 

Summary of Contents for Reference 75

Page 1: ...Owner s Manual Model Reference 75 Stereo Power Amplifier...

Page 2: ...cessories 4 Warnings 4 Vacuum Tubes and Preparation for Use 5 Panel Controls 5 Installation 5 6 Connections 6 7 Remote Turn on Connections 7 Operating Procedure 7 Output Tube Bias Adjustment 8 Servici...

Page 3: ...3...

Page 4: ...ge 3 conductor power cord on your Reference 75 is equipped with a standard 3 prong grounding plug If used normally it will provide a safe earth ground connection of the chassis Defeat of the grounding...

Page 5: ...le this is often recommended for solid state equipment Audio Research does not recommend this procedure for vacuum tube power amplifiers 2 000 hours of tube life will elapse in 84 days ROTARY KNOBS Se...

Page 6: ...the red or speaker terminal to the wire that connects to the 4 or 8 terminal on the Reference 75 and tighten the speaker terminals securely to ensure best sonic results Matching It is important to us...

Page 7: ...are provided to allow chaining connections to control two or more Reference 75s or other equipment The 12V IN jack should be connected to the 12VDC output of the master control system using a continu...

Page 8: ...bias switch is set to that associated V number position The meter should be set to read in the center of the tube bias arc 65mA for each of the four output tubes V1 V4 for optimum sonic performance Se...

Page 9: ...rranty vacuum tubes This Limited Warranty initiates from the date of purchase and is limited to the original purchaser or in the case of demonstration equipment limited to the balance of warranty rema...

Page 10: ...Balanced input pin 2 IEC 268 OUTPUT TAPS 8 ohms 4 ohms OUTPUT REGULATION Approximately 1 0dB 8 ohm load to open circuit Damping factor approximately 8 OVERALL NEGATIVE FEEDBACK 15dB SLEW RATE 10 volts...

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