*See engineers notes at rear
Page 4
IMPORTANT READ THESE NOTES THROUGH FIRST BEFORE USE!
2 QUICK SET UP GUIDE
Your safety is paramount to us. Big triode valve
like the 845s operate using very 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. Do not leave
unattended. Not suitable for operation by children.
1 Unpack the 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.
2 If Necessary fit the valves, or check that they are
firmly in place.
SEE FITTING DIAGRAM.
Fit the valves according to the numbers written on
the base of the valve, and on the socket, normally
1-9.
The 845s should be fitted in the four
left and
right
sockets. Observe LEFT and RIGHT. Fit by
locating the bayonet pin on the side of the valve and
push gently but firmly down until they are fully home.
The smaller valves should also be gently but firmly
pushed into place. The 6SL7 (or 6188/6N9) is fitted to
the middle, and the 6SN7 (or CV181/6N8) to both the
left and right positions as marked. The single rectifier
valve GZ34/5AR4 belongs in the centre position.
Be careful to note the correct orientation of the
small 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. Hold the valves as close to the base
as 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. CD, Phono pre-amp,
Tuner etc via RCA sockets on the rear. All inputs are
exactly the same level and impedance.
4 Connect to rear speaker terminals
Observe the
red and black terminals to ensure correct polarity.
(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.
(To
avoid danger to children). 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 the 845
heaters should glow bright yellow. You will may hear a
“humming noise” for a 1-2 seconds through your
speakers, this is normal. After about 30 seconds the
amplifier should be working. The small valves may
have a visible orange glow from the cathode heaters.
With the pre amp volume control set to minimum there
should be no sound coming from the speakers except
a barely discernable hum. If there are any unpleasant
sounds coming from the speakers, switch off and refer
to the ‘Trouble Shooting’ section or contact your
dealer or Icon Audio.
7 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. Otherwise select according to
preference.
8 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. Power transformers may hum slightly.
D, The amplifier may smell slightly when new.
E, M
obile phone ‘breakthrough’ is normal.
F
, Valves may make a ‘tinkling’ sound when
warming up and cooling down.
G, One channel may come on before the other at
switch on.
H,
There may be a ‘click’ when switching off.
I, T
he occasional “click” or “pop” is normal.
J, The hum level may be higher for about 30 secs
after switching on.
9 Health and Safety
. The valves when operating
have high surface temperatures. Keep out of reach
of children and pets. Use of the supplied valve cover
is recommended. Always unplug when making any
changes.
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 845 bias pre sets without reference to
the manual. Incorrect adjustment could cause the
valves to overheat, resulting
in damage to valves
and amplifier.
9 Bias Adjustment:
The bias adjustment is factory set. No initial
adjustment is normally needed.
However you
should initially check the bias of the 845 valves to
make sure it is correct for your mains voltage.
Full
details will be found in section 6.
