Audio Research HD220 Owner'S Manual Download Page 2

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Contents

Model HD220

Section Page No.

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Vacuum Tubes and Preparation for Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Panel Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Use of Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2, 3

Balanced Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Single-Ended Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Remote Turn-on Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Operating Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3, 4

Start-Up Following “Protect” Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Cooling Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Hour Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Disposal and Recycling Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Warranty Terms and Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Summary of Contents for HD220

Page 1: ...3900 ANNAPOLIS LANE NORTH PLYMOUTH MINNESOTA 55447 5447 PHONE 763 577 9700 FAX 763 577 0323 Model HD220 STEREO POWER AMPLIFIER Owner s Manual...

Page 2: ...ntrols 2 Use of Controls 2 Installation 2 Connections 2 3 Balanced Operation 3 Single Ended Operation 3 Remote Turn on Connections 3 Operating Procedure 3 4 Start Up Following Protect Shutdown 4 Cooli...

Page 3: ...ZARDOUS HD220 S T ER E O AM P L I F IE R VOLTS SERIAL PLYMOUTH MINNESOTA MADE IN U S A CAUTION FOR CONTINUED PROTECTION AGAINST FIRE HAZARD REPLACE FUSE ONLY WITH SAME TYPE AND RATING WARNING RISK OF...

Page 4: ...personnel 4 The 12 gauge 3 conductor detachable power cord on your HD220 is equipped with a standard 3 prong grounding plug If used normally it will provide a safe earth ground connection of the chass...

Page 5: ...is sitting on a soft surface such as a thick 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 suppor...

Page 6: ...chieved when the only direct connection between audio common ground and true earth ground occurs in the preamplifier through its grounded power cord Other equipment in the system should have some form...

Page 7: ...e information about reset procedure Servicing Because of its careful design and exacting standards of manufacture your HD220 amplifier should normally require only minimal service to maintain its high...

Page 8: ...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 descrip tion of the problem s encountered and a...