Octave JUBILEE Mono, Руководство пользователя

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10
3. GETTING STARTED
3.4. Recommended procedure
Please note:
Before you use your
amplifier for the first time, we
strongly recommend
you to follow
the procedure described in the fol-
lowing eight points, even if your
dealer has already set the amplifier up for you.
By checking these eight points, you will also fa-
miliarize yourself with the controls of your ampli-
fier. Furthermore it will eliminate the possibility of
user’s error.
1. Connect the power amplifiers to an earthed
wall socket using the power cable supplied.
2. Connect your loudspeakers

and
preamplifier to the rear panel of the
JUBILEE MONO SE amplifiers. (see
chap.4.1)
3. Push the power switch

above the power
inlet socket on the rear panel. (see chap.
4.1)
Start phase
4. Now push the power (stand by) button

on the top of the amplifier.
The unit will be switched on electronically
via an internal relay and you will hear a
clicking sound as the relay switches in. LED
A and LED B light up in the display and -
depending on the position of the Power Pre
Selector - LED C or LED D. The display
meter reads 000. (see chap.4.2
)
The start phase takes approx. 4 - 5 minutes.
LED A (start LED) remains lit during this
time. Since the amplifier is muted by default,
LED B (muting LED) illuminates regardless
of the position of the muting switch.
Pressing the muting button makes LED B
slightly brighter.
It is not possible to play music during the
start phase. The Power Pre Selector switch
should set to "low"; the green LED C
illuminates this function.
5. After about two minutes, you will hear the
sound of a second relay cutting in. This
indicates that the output tubes are being
heated up and they will begin to glow.
6. LED A and B go out once the start phase
has been completed. Your amplifier is now
ready for use. (You must deactivate the
muting function, in case this function is ON,
so that LED B is extinguished.)
Functional test: Power Pre Selector
7. Set the Power Pre selector to bias
“Low”, indicated by LED C of the
display.
8. Before listening to music, check the
amplifier for correct operation and
make adjustments if required.
Check the operation of the tubes and the
amplifier itself using the bias measurement
selector switch
.
Switch in position V1:
The bias current of output tube V 1 is
selected with the switch in position V 1, and
the reading is shown in the meter
Bias low reading: approx. 250-400
Turn the knob to check all eight tubes. All
eight tubes will give a similar reading. If the
reading of the tubes is too high use the
screwdriver supplied to turn the bias control
regulators

on the rear panel. Turn the
bias regulators until you get a reading of
approximately 400, +/-20%.
If one (or more) of the eight tubes shows
a reading of 0 or well above 400, the
tube(s) must be replaced.