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1 Unpack unit carefully. Make sure that it is in
good condition. If not report to Icon Audio. It is
important
that
you
warranty/service return.
Contents
ST60 MK IV amplifier
Valve cover
Remote control
IEC power cable
Manual
4x KT150
4x 6SN7/CV181
Screwdriver for bias adjusting
1x spare mains fuse (in IEC socket drawer)
2x spare HT fuse (inside amplifier)
2 If necessary fit the valves, or check that they
are firmly in place. The KT120/KT150s should
be fitted first observing the numbers v1,v2,v3,v4
written on the rear of the valve; this corresponds
with the four sockets (nearest the transformers)
from left to right viewed from the front of the amp.
This is important as the performance of the
amplifier was optimised this way. The smaller
6SN7 Nos 5,6,7,8 may be gently pushed into
place.
CAUTION:
Align each valve carefully before inserting
with the "ridge" on the valve spigot to match
the "indent" in the middle of the socket.
The central locating spigot is easily broken so
do not use excessive force.
Do not push or pull the valves excessively by
the glass envelope, this could cause the glass
envelope to become detached from the base,
damaging the valve.
3 Connect to source units, e.g. CD, Tuner,
Tape, Phono pre amp (if used) etc via rear RCA
sockets. All inputs are at the same level. The
names are only for reference.
4 Connect to speakers (4 to 16 ohms). The
correct polarity is vital for correct operation. Cable
colours may vary. Check that the red output
terminal of the ST60 is connect to the red terminal
of the loudspeaker on both channels.
If 'bi-wiring' both 'common' should go to the black
terminal and both 'positive' (or red) should go to 8
ohm terminals.
5 Connect to mains supply using supplied IEC
mains lead to 230-240v (117v USA/Canada). If
for some reason the welded plug must be
removed, please remove fuse and dispose of
safely. (As they are dangerous 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 Before switching on make sure that the
"standby switch" is in the "up" position.
SWITCH ON! The meter should light up. Leave
for at least 60 seconds to for the valves to warm
up, and then push the "standby" switch into the
IMPORTANT READ THIS FIRST
3 QUICK SET UP GUIDE
keep
packaging
for
"down" position. The amplifier should now be
working. All valves should have a visible orange
glow from the cathode heaters. With the volume
control set to minimum (fully anti-clockwise) there
should be no sound coming from the speakers
except a barely discernible gentle hum. If there
are any unpleasant sounds coming from the
speakers, switch off and refer to the 'Trouble
Shooting' section or contact Icon Audio.
With the correct input selected the amplifier
should now be working.
We suggest you switch to "standby" when
switching off, (to be ready for your next session).
7 Check the KT150 bias.
Rotate the bias knob through 1-4, each position
should show the pointer in or near the black
section of the scale. This has been pre-set in the
factory so no initial adjustment is normally
necessary unless one valve is seriously out of
line. Refer to section 8.
8 Power amplifier use of the integrated amp
Located on the rear, this switch is normally "UP"
for integrated operation (high sensitivity). If use
with a pre-amplifier is required, the switch should
be "DOWN" in the low sensitivity position. The
"Tape" input is the most direct. Set with the
volume on "FULL" or as required.
See section 5.
9 Your amplifier 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.
Please note all these things are normal for
valve amplifiers:
A, Valves can get very hot, BEWARE!
B, The mains transformer will get quite warm
C, the amplifier may smell slightly at first.
D, Mobile phone 'breakthrough' is normal.
E, Valves may make a 'tinkling' sound when
warming up and cooling down.
10 Do not switch between "Ultralinear" and
"Triode"
without
"Standby".
This
could
damage to the transformers which would not
be covered under warranty.
11 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
circumstances. Always unplug when making
adjustments. Like all amplifiers there are
potentially lethal high voltages inside, which
when switched off can take several 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 KT150/120
first
switching
into
cause
irreparable
in
these
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