icon Audio Stereo 40 6AS7 Limited Edition, Instruction Manual

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Page 3
IMPORTANT! READ THIS ALL THE WAY THROUGH FIRST
2 QUICK SET UP GUIDE
Box contents:
Amplifier, remote control, mains lead, manual,
bias meter. 4x 6AS7 2x 6SN7, 6SL7, 274B/GZ34
1 Unpack unit carefully and check that it is in
good condition. Transit damage must be reported
to Icon Audio within 3 days. It is important that you
keep packaging for warranty/service return.
2 If necessary fit the valves, or check that they
are firmly in place. (SEE DIAGRAM)
The larger
four 6AS7s should be fitted first observing the
numbers 1,2,3,4 on the rear of the valve; this
corresponds with the four sockets from left to right
viewed from the front. This is essential as each
valve is ‘set up’ in this position.
Do not push or
pull the output valves excessively by the
glass
, this could cause the glass envelope to
become detached from the base, damaging the
valve.
Note the orientation of the
“spigot” in
the middle of the pins which lines up with the
sockets of all the valves
.
Then fit single 274B/GZ34
Then fit the three smaller valves in the sockets
along the front valves noting the numbers. The
middle one is a 6SL7, the outside pair are 6SN7.
The 274B rectifier valve should be fitted in the
centre position.
3 Connect to source units , e.g. CD, Tuner,
Tape, Phono pre amp (if used) etc via appropriate
phono sockets.
4 Connect to speakers making sure that the
correct impedance (ohms) is chosen, (see back of
speakers). Most modern speakers are 6 ohms
which so this is not critical (see Ch 3), if you are
not sure start by using the 8
ohms (and “0”)
terminals.
Don’t forget to get the correct polarity of
speaker cables. (See speaker connections
chapter). If ‘bi-wiring’ both ‘common’ should go to
the black terminal, and both ‘positive’ (or red)
should go to either 4 or 8 ohm terminals.
5 Connect to mains supply using supplied IEC
mains lead to 220/240v supply. If for some
reason the welded plug must be removed,
please
remove 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.
6A Put the STANDBY swit
ch in the “up”
position.
6B SWITCH ON!
The front LED should light and
the valves will take approximately 60 seconds to
start working. All valves should have a visible
orange glow from the cathode heaters. After 60
seconds push the standby switch down. The
amplifier should now be working.
6C The Volume
control will “re-set” on switch on
to aprox “9pm” position. There should be no
sound coming from the speakers except a barely
discernable gentle hum. If there are any
unexpected sounds coming from the speakers,
switch off and refer to the ‘Trouble Shooting’
section or contact your dealer or Icon Audio.
If you do not intend to use the amplifier for a few
hours you can switch
into “standby”, when it will
use minimal power and be ready for use
“instantly”. In standby you may hear
low distorted
sound from the speakers if you have a source
playing. This is normal, reduce the volume!
7 Your unit should now be functioning . If not
check wiring again and/Use selector/tape
monitor/volume to choose source program and
suitable listening volume. Do not operate at a high
volume for the first five minutes to allow the valves
to warm up properly.
8, Remote Control. If the batteries are OK (2x
AAA) the LED should light when any of the keys
are pressed. A little skill is needed in pointing and
pressing, as the unit has a motorised “pot” which
may not be as responsive as your TV.
Please note all these things are normal for
valve amplifiers:
A, Valves can get very hot, BEWARE!
B, The power transformer will get quite warm
C, The amplifier may smell slightly for a few weeks.
D, Mobile phone ‘breakthrough’ is normal.
E, Valves may make a ‘tinkling’ sound when
warming up and cooling down.
F, The volume control may sometimes appear to
sound ‘Scratchy’, this is not a fault!
G, Valves occ
asionally “Pop” or “Crackle”. If this is
regular problem it could be your CH
boiler/cooker/fridge etc. (see trouble shooting).
8 Health and Safety . The valves when operating
have high surface temperatures. Keep out of
reach of children and pets. The use of the
supplied guard is recommended in these
circumstances. Always unplug when making
adjustments.
Like all amplifiers there are
potentially lethal high voltages inside (over
400v DC), 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 output valve grid
bias pre sets without reference to the manual.
Incorrect adjustment could cause the valves to
overheat, with resulting in damage to valves and
amplifier.
To maintain the best performance of the
amplifier you should check the bias of the
output valves from time to time (say twice a
year). Full details will be found in section 7.