Page 7
use an interconnect which only has the screen
connected at one end. Other causes of low-level
hum can be from adjacent equipment, so
experiment with moving equipment around to see
if this makes the hum better or worse.
One channel missing.
Usually ‘bad’ connection on either the input or the
speakers. Try swapping the connection over to
establish if the cause is:
(a) Input to the amp.
Sound will move to the
other channel.
(b) Amplifier or speakers.
Sound will not
move.
Strange noises coming from speakers
Turn volume to minimum on unused input, if
problem corrected either fault with source unit or
with connection. If noise persists, problem with
amplifier.
If a whole output valve glows red (other than the
heater), often accompanied by a hum through the
speakers, switch off immediately, and refer to Icon
Audio or a service engineer, as this could be valve
failure.
A valve that is lit up is not a guarantee that it is
working properly; conversely a valve that is not lit
up will not be working.
Valve Replacement
(see also section 7)
Valve life will depend upon such things as hours
of use and number of on/off cycles, the HT Delay
Circuit if fitted will extend the life of valves by not
stressing them when cold. It is not good practice
to remove the valves unnecessarily as this can
strain the pins and cause tiny air leaks.
Service:
Should you suspect a problem, you
should return the unit to your agent/dealer or Icon
Audio for a periodic service. In case of difficulty
you could email or phone us. You could also
return the valves to Icon UK for testing free of
charge. Carefully remove the valves (the KT88s
should be held by the base when removing, to
prevent damage) numbering them with a marker
or sticker from left to right from the front, in order
that that may be replaced in the same position.
They should be well packed in cardboard & foam
or similar, (Valves are very rugged if packed
properly).
6 Specification & Features
(Typical conditions @ 240v 50Hz)
KT88 output valves or eqv (e.g. 6550)
6SN7 phase splitter
6SL7 first stage amplifier
Hand wired point to point components
No printed circuit board
No tag board
Ceramic valve bases for low noise/leakage
65w RMS* per channel Ultralinear
30w RMS* per channel Triode mode
Signal to noise level better than -97db
Freq response 20-20khz +or- 0.5db any power
Power bandwidth 10hz-30khz
THD better than 0.2% any power
4 and 8 ohms output taps
Japanese EI transformers
Choke regulated power supply
Supplied with attractive safety guard
Minimal feedback used
3 potted transformers to reduce noise
High quality metal film & wire wound resistors
High quality polypropylene audio caps
Japanese ‘Blue’ ALPS volume pot.
Rubicon/Philips power capacitors.
Audio wiring with silver PTFE cable
Valves carefully matched for best performance
Gold plated Input & speaker terminals
Inputs for CD, Tape, Tuner, Aux
Tape monitor output, buffered
300 mv sensitivity for full output
230/240volts, 240watts (500 max)
3 amp rear fuse (with spare)
440W, 400D, 230H
, 30kg (remember to allow
space for connections and ventilation)
IEC mains lead, (5amp fused)
CE
certified
* Refers to measured RMS voltage across 8 Ohms.
(Specifications subject to change, errors & omissions excepted 29/08/14)
