Audio Research Reference 75 Bedienungshandbuch PDF herunterladen (Seite 8)

!

8!

Output Tube Bias Adjustment

As shipped from the factory, the output

‘bias’ adjustments are set for a nominal

65mA per KT120 tube. Under these idle

conditions the tubes are each dissipating

approximately 27 watts of their 60 watt

rating. This point of operation provides

‘enriched’ Class AB1, and will satisfy the

most critical listener.

For best results, operate and adjust the

Reference 75 at 117.5 VAC (230 VAC).

Adjustment must be made under zero-

signal conditions after at least 15-20

minutes of uninterrupted stabilization time.

With the amplifier warmed up and signal

set to zero, switch the rotary knob to one

of the ‘V’ settings. Insert only the supplied

non-conductive bias adjustment tool into

the appropriate bias adjustment holes.

Slowly turn the bias adjustment

potentiometer in each of the holes

marked with the output tube ‘V’ number

position only when the 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.

Servicing

Because of its careful design and exacting

standards of manufacture, your Reference

75 amplifier should normally require only

minimal service to maintain its high level of

performance.

Caution: The Reference 75 amplifier

contains sufficient levels of voltage and

current to be lethal. Do not tamper with a

component or part inside the unit. Even

with the power turned off, a charge

remains in the energy storage capacitors

for some time. Refer any needed service

to your authorized Audio Research dealer

or other qualified technician. Additional

questions regarding the operation,

maintenance or servicing of your amplifier

may be referred to the Customer Service

Department of Audio Research

Corporation at 763.577.9700 (CST). When

ordering a service manual from Audio

Research or an authorized dealer, be sure

to identify the serial number on your

amplifier.

1 2 3 4 5 6 7 8 9 10

Kommentare zu diesen Handbüchern

Keine Kommentare