*See engineers notes at rear
Page
4
IMPORTANT READ THESE NOTES THROUGH FIRST!
2 QUICK SET UP GUIDE
Your safety is paramount to us. Valve
amplifiers like the MB30m operate using high
voltages. Please take care when setting up
and adjusting. DO NOT OPERATE WITHOUT
VALVES FITTED. If you are uncertain how to
proceed at any point ask your dealer or Icon
Audio.
1 Unpack each unit carefully
. Make sure that it
is in good condition. If not report to Icon Audio or
your dealer. It is important that you keep the
packaging for warranty/service return/shipping.
NOTE THE “LEFT” and “RIGHT” orientation on
each amplifier. Also keep the left and right
amplifier valves separate.
2 If Necessary fit the valves, or check that they
are firmly in place.
Fit the valves according to the numbers
written on the base of the valve, and on the
socket. Observe “Left” and “Right”.
The valves
should be pushed gently but firmly all the way
down.
Be careful to note the correct orientation of
the valves central “spigot” between the pins
otherwise damage could occur.
To avoid damage to the valves, do not twist the
glass envelopes excessively as they may become
loose/detached from their base. Hold the valves
by the base if possible. Damage to valves is not
covered by the warranty. These valves have
already been fitted and tested for quality.
3 Connect to source unit
, e.g. Pre amp, Passive
pre amp etc via sockets on the rear.
4 Connect speaker terminals
use “0” &“8 ohm”
terminals unless you have 4 ohm speakers (see
P5) Make sure that the polarity is correct. (See
speaker connections chapter 3). If ‘bi-wiring’ both
‘common’ should go to the black terminal and both
‘positive’ (or red) should go to the red terminals.
5 Connect to mains
supply using supplied IEC
mains lead to 230/240v supply (or 120v)*.
If for
some reason the welded plug must be
removed, please remove plug fuse and
dispose of immediately.
(As they can be a
danger to children if plugged in). The replacement
plug should be wired in the following way Brown
to Live terminal, Blue to Neutral terminal and
Green/Yellow to Earth terminal.
6 SWITCH ON!
The meter should light up and a
visible glow may be seen inside the valves when
viewed from certain angles. After about one
minute the amplifier should now be working. With
the pre amp volume control set to minimum there
should be no sound coming from the speakers
except a barely discernible hum. If there are any
unpleasant sounds coming from the speakers,
switch off and refer to the ‘Trouble Shooting’
section or contact Icon Audio.
6a Sensitivity Switch
Located on the rear, this switch is “UP” (H) for
(high sensitivity) operation. If use with a pre-
amplifier is required, the switch should be
“DOWN” in the low sensitivity position.
7 Your unit should now be functioning
. If not
check wiring again. Do not operate at a high
volume for the first five minutes to allow the valves
to warm up properly.
Please note all these things are normal
for valve amplifiers:
A, Valves can get very hot, BEWARE!
B, The transformer covers will get quite warm
C, The amplifier may smell slightly for a few
weeks.
D, Occasional Mobile phone ‘breakthrough’ is
normal.
E, Valves may make a ‘tinkling’ sound when
warming up and cooling down.
F, One channel may come on before the other at
switch on.
G, There may be a ‘click’ when switching off.
H, The occasional “click” or “pop” is normal.
8 Health and Safety
. The valves when operating
have high surface temperatures.
Keep out of reach of children and pets. Always
unplug when making adjustments.
Like all
amplifiers there are potentially lethal high
voltages inside, which when switched off can
take twenty minutes to discharge!
Do not
remove bottom panel unless you are a competent
engineer. There are no user serviceable parts
inside.
Like other household electrical
appliances do not leave unattended whilst
switched on.
Do not adjust the bias pre sets
without reference to the manual. Incorrect
adjustment could cause the valves to overheat,
with resulting
in damage to valves and
amplifier.
Bias Adjustment:
The bias adjustment is factory set. No initial
adjustment is normally needed.
However you should initially check the bias of the
KT120 valves to make sure it is correct for your
mains voltage.
Full details are in section 6.
