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15
6. TUBES
6.2 GENERAL INFORMATION
Tube life
Thanks to the protection circuits and soft-
start electronics, you can expect your out-
put tubes to last for an average of five
years.
Differences in tube service life
Faulty tubes can be replaced individually. It
is not necessary to replace an entire set.
Running in
New tubes can require a relatively long time
(up to 300 hours) to achieve their optimum
sound quality.
Faulty tubes
Manufacturing faults in tubes may only be-
come evident after about 100 hours of use.
You should therefore be wary of installing
untested tubes. However, faulty tubes or
tubes of the incorrect type will normally not
damage the amplifier. Nevertheless, they
may cause loud crackling noices in your
loudspeakers.
6.3 REPLACING TUBES
1.
For safety reasons, only qualified per-
sonnel should open the amplifier and re-
place the tubes.
2.
Switch off the preamplifier, unplug the
power cord from the wall socket and allow
the unit
10 minutes to cool down.
3.
The Jubilee's automatic discharge sys-
tem will discharge the power supply capaci-
tors. The red LED
31
will be lit during this
time (see Tube Layout, Section 6.1). To
avoid an electric shock, wait until this LED
has extinguished before opening the case.
4.
Remove the acrylic cover and the right
stainless steel lid above the input selector
knob
3
.
5. Take out the old tubes
Carefully remove the tubes from their sock-
ets,
taking care not to exert sideward-
pressure on the sockets.
6. Fit new tubes
Please only use original OCTAVE replace-
ment tubes. These have been tested and
selected for use in our amplifiers.
Please ensure that the tube pins are all
perfectly straight before inserting your new
tubes. Straighten any bent pins very
carefully by hand if necessary. No adjust-
ments are necessary to your amplifier after
fitting new tubes.
7. Cleaning tips
Cleaning agents and contact cleaners are
not recommended for tube sockets. Clean
dirty sockets with compressed air and clean
dirty tube pins carefully using a wire brush.
A toothbrush dipped in isopropyl alcohol
also works well.
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