Audio Research Reference 75 Bedienungshandbuch PDF herunterladen (Seite 5)

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5!

DO NOT ATTEMPT TO OPERATE THIS

EQUIPMENT BEFORE INSTALLING THE

NUMBERED VACUUM TUBES IN THEIR

RESPECTIVE SOCKETS.

Vacuum Tubes and

Preparation for Use

Your Reference 75 amplifier is shipped with

the vacuum tubes packed in foam blocks.

These must be unpacked and installed

before you attempt to operate the

amplifier. Included are two matched pair

of KT120 output tubes, and two 6H30 dual

triodes used in the input stage. Proceed

according to the following instructions.

Carefully remove each vacuum tube from

its protective foam and match its location

‘V’ number (written on the base of the

tube) to the ‘V’ number printed next to

each socket. Firmly seat each tube in its

matching socket, taking care to ‘key’ the

tube pins to the socket holes. Retain the

foam blocks with other packing materials

for possible future use.

Refasten top cover on amplifier.

Panel Controls

The front panel has:

1 Power line On-Off switch

2 Rotary knobs for Operate/Bias control

1-Power ‘On’ LED (Green) indicator

POWER-ON SWITCH: Initiates/terminates

AC line power to the amplifier. Function

indicated by green LED above switch.

Note: Audio Research does not

recommend leaving your Reference 75

‘on’ 24 hours a day as is the custom of

some audiophiles to achieve maximum

sonic performance on demand. While 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: Set switch to center

position to operate each channel. Meters

show power output level when switch is set

to Operate mode. To check and adjust

output tube bias level, turn either rotary

knob to one of the two ‘V’ number output

tube pair bias positions for each channel.

See output tube bias adjustment

procedure on page 8.

The rear panel has:

1 Meter lights toggle switch

TOGGLE SWITCH: Select between the ‘On’

and ‘Off’ position to control meter

illumination.

Installation

To insure normal component life and safe

operation this unit must be operated only

in an upright position. Adequate airflow

and proper cooling can occur only if there

is no restriction above and behind 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 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.

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