Audio Research Reference 600 Bedienungsanleitung Seite 8

Model Reference
After putting the Power switch in the "Operate" posi-
tion, set the VI-V8/V9-V16
"VI-V8 test" position and set the VI-V8 Meter indication
switch in the "VI" position. As the unit warms up, make
a slow preliminary adjustment of the "VI" trim poten-
tiometer using only the red plastic insulated screwdriver
included with the unit. Adjust the pot so that "VI" reads
within the green (normal) portion of the arc on the Pow-
er output and tube operating range meter. Continue ro-
tating the VI-V8 Meter indication switch through the
V2-V8 positions, adjusting the corresponding trim pot
on the front panel in turn so the meter reading for each
tube falls within the green (normal) portion of the meter
arc. Next, set the VI-V8/V9-V16
the "V9-V16 test" position and repeat the above tube
bias adjustment procedure in order on the V9-V16tubes.
After about 20 minutes, a fine adjustment of each tube
bias position should be made as needed. During the bias
adjustment procedure the amplifier's input is muted.
Note that it is not necessaryto repeat the tube bias adjust-
ment procedure each time the amplifier is turned on. It
should be repeated occasionally, however, to determine
that all of the power output tubes are operating normally.
Should any tube fail to adjust within the normal range of
the meter, that tube is faulty, and should be replaced.
6. Return the VI-V8/V9-V16
"PWR OUT" (center) position for listening. Your Refer-
ence 600 is now ready for operation. However, a full
stabilization or warm-up period of at least one-half (1/2)
hour is recommendedfor best sonic performance.
7. During operation, the Power output and tube operating
range meter indicates the approximate power output (in
watts) of the amplifier.
8. Fan speed and meter illumination controls may be set
where desired. Note that a higher fan speed setting (at
the cost of only slightly higher fan noise) will increase
cooling and extend tube life.
Note: When using the test position for checking or adjust-
ing output tube currrent, it is normal for the right-hand
meter to fluctuate slightly with typical power line fluctua-
tions. The right-hand meter is more sensitive to these
fluctuations than the left-hand meter. Use an average
meter indication, and disregard these fluctuations. (They
do not affect the performance.)
4
600
test selector switch in the
test selector switch in
test selector switch to the
Servicing
Becauseof its careful design and exacting standards of
manufacture, y our Reference 600 amplifier shouldnormally
require only minimal serviceto maintain its high level of
performance.
CAUTION: The Reference600 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
storagecapacitorsfor sometime. Referany neededservice
to your authorized Audio Research dealer or other
qualified technician.
The vacuum tubes inside the Reference600 are high-quality
6550, 7233, 12AX7 and 6922 types. The power output
tubes supplied with your new Reference600 are matched
pairs of 6550's. Reliable.
replacementtubes —such as those available from ARC—are
strongly recommended for maximum performance and
longevity.Observethe operatingand adjustmentprocedure
for adjusting bias when replacing any power output tubes.
Expectedservice life from a set at 6550 output tubes is
approximately 2000 hours, and will vary with conditions
of use.
Additional questions regarding the operation, maintenance
or servicing of your amplifier may be referred to the Cus-
tomer Service Department of Audio ResearchCorporation
at 612-939-0600 (CST). When ordering a service manual
from Audio Research or an authorized
identify the serial number on your amplifier.
Cleaning
To maintain the new appearance of this unit. occasionally
wipe the front panel and top coverwith a soft, damp(not
wet) cloth to remove dust. A mild, non-alkaline soap solu-
tion may be used to remove fingerprints or similar
smudges. C leaners containingabrasivesshouldnot be used
as they will damagethe anodizedfinish of the front panel.
A small.soft paint brushis effectivein removingdust from
bevels,the recessed nameplateand other featuresof the
front panel.
matched, low gas 6550
dealer. be sure to