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If not, identify which input is causing hum.
Connect one input at a time. A common cause is
a 'hum loop' caused by having to many earths,
and may be identified by unplugging each input
source from the mains. One remedy for this is to
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.
Interference Problems
The amplifier design incorporates features and
devices which make it resistant to mains-born
interference. But some CH boilers/fridges/cookers
etc
can
generate
interference which travels through the air (and
walls). Although rare this can be very irritating. In
this case a simple capacitor is often all that is
needed to effect a permanent cure (ask us).
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.
other channel.
(b) Amplifier or speakers.
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 the valve by
not stressing the cathode when it is 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
could return the unit to Icon Audio for a periodic
service or return the valves for testing free of
charge. You should carefully remove the valves
(the EL34s should be held by the base when
removing, to prevent damage) numbering them
RF
(radio
frequency)
Sound will move to the
Sound
will
not
with a marker from left to right as you do so in
order that that may be replaced in the same
position. They should be well packed in cardboard
& foam or similar, and returned to Icon Audio for
testing. (Valves are very rugged if packed
properly).
Mains Supply
This amplifier is hard wired to work on 230/240v
ac. The transformer may easily be re-configured
for 110/120v ac. Contact for more information.
6 Specification & Features
(Typical conditions @ 240v 50Hz)
•
EL34 output valves or eqv (6CA7)
•
6SL7 double triodes for first stage
•
6SN7 double triodes phase-splitter
•
Hand wired point to point components
•
No printed circuit board
•
No tag board
•
Ceramic valve bases for low noise/leakage
•
HT delay circuit to protect cathodes (optional)
•
40w RMS per channel Ultralinear
•
20w RMS per channel Triode mode
•
Signal to noise level -90db
•
Freq response 20-20khz +or- 1db
•
Power bandwidth 10hz-30khz
•
0.2% THD at full output
•
4 and 8 ohms output taps
•
Japanese EI transformers
•
Choke regulated power supply
•
Supplied with attractive safety guard
•
Minimal feedback used
•
3 section transformer cover to reduce noise
•
High quality metal film & wire wound resistors
•
High quality polypropylene audio caps
•
Japanese 'Blue' ALPS volume pot.
•
Rubicon/Nichichron power caps.
•
Internal wiring using silver gilt cable
•
Valves carefully matched for best performance
•
Polished stainless steel chassis
•
Gold plated Input & speaker terminals
•
Inputs for CD, Tape, Tuner, Aux
•
Tape monitor (not ie or SE)
•
300 mv sensitivity for full output
•
230/240volts, 135-200watts
•
1.6 amp rear fuse (with spare)
•
320W, 250D, 180H, 23kg
•
IEC mains lead, (5amp fused)
•
CE certified
•
Conforms to ROHS and WEEE where applicable
Specification subject to change without notice.
Page 6
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