Audio Research Reference 750 Manuel du propriétaire télécharger pdf (Page 5)

Preface

Please take time to carefully read and understand

the following information and instructions before

you install or attempt to operate your Audio

Research Reference 750 vacuum tube monoblock

power amplifier. Becoming familiar with important

facts about your amplifier and its correct operating

procedures will help assure maximum musical

satisfaction and reliable operation.

Packaging

Save all packaging accompanying this product.

You have purchased a precision electronic

instrument, and it should be properly cartoned any

time shipment becomes necessary. It is very

possible that this unit could be damaged during

shipment if repackaged in cartoning other than

that designed for it. The original packaging

materials help protect your investment from

unnecessary damage, delay and added expense

whenever shipment of this unit is required.

See separate ‘Unpacking/Repacking Instructions’

card attached to the outer amplifier carton before

attempting to unpack or repack this amplifier for

shipment. Retain unpacking/repacking instructions

for future reference.

Accessories

1 – Phillips-head screwdriver for panel removal.

1 – Plastic screwdriver for front panel potentiometer

bias adjustment.

Fuses

1 – 2 Amp MDQ slo-blo for LV power transformer in

120V units.

1 – T1 Amp fast-blo for LV power transformer in 220,

240V units.

1 – 4 Amp MDQ slo-blo for start-up circuit in 120V

units.

1 – T3.15 Amp fast-blo for start-up circuit in 220, 240V

units

1 – 20 Amp MDA for main power in 120V units.

1 – 10 Amp MDA for main power in 220, 240V units.

CAUTION: When replacing fuses, use

ONLY the value and type of fuse

originally shipped with the amplifier.

Use of a different fuse value could

cause catastrophic damage to your

amplifier and will also void your warranty. Audio

Research selects fuses not only on grounds of safety

but also for their sonic performance.

Vacuum Tubes and Preparation for

Use

Do not attempt to operate this amplifier before

installing the necessary vacuum tubes in their

indicated sockets. The tubes are protectively

packed in a separate carton; save packing for

possible future use.

1. All input, driver and output-stage tube locations

are clearly labeled with tube type and “V”

number on the anodized plate covering the top

of the amplifier. There is one 6H30 input tube, two

KT120 drivers, and 16 KT120 output tubes. In

addition, two power-supply regulator tubes–one

6H30 and one 6550 – are located inside on the

upper or second-level circuit board. To access this

location, use the supplied Phillips-head

screwdriver to remove all fastening screws on one

of either of the two side panels; the tube sockets

will be visible near the center of the board.

2. Match each tube's ‘V’ number marked on the

tube with the ‘V’ number of the corresponding

socket. Insert tubes by carefully aligning tube pins

with socket holes and gently applying downward

pressure. The base of the tube should firmly

contact the surface of the socket. Once the

power-supply tubes have been installed inside the

amplifier, refasten the side panel and proceed to

install the tubes on top of the amplifier.

3. Note: In general, contact enhancers are not

recommend for use on vacuum tube contact

pins. With continual exposure to heat and air,

many of these substances can form gummy, dust-

collecting residues which actually reduce

contact and degrade sonic performance. Proper

external use of these preparations – on

interconnect plugs, speaker connections, etc.– is

subject to the discretion of the owner. Contact

Audio Research for specific recommendations.

Installation

To insure normal component life and safe operation

this unit must be operated only in an upright

position. Adequate air flow and proper cooling

can occur only if there is no restriction above the

unit and on either side.

The special non-marring elastomer feet provide

adequate spacing and stability only on a smooth,

hard surface. For upright stability, never operate the

unit while it is sitting on a soft surface such as a thick

rug or carpet.

Due to its unusually high weight, this amplifier must

be supported on a surface specifically rated for

such a load. Standard furniture cabinetry and

shelving are not typically designed to adequately

support this amplifier. Check with the manufacturer

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Audio Research Reference 750 Manuel du propriétaire Page 5

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