Page 6
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.
If you have connected both a known good input
and a known good speaker to a particular channel
without success the fault is probably within the
amplifier.
Strange noises coming from speakers
Turn volume to minimum on unused input, if the
noise disappears, the fault is with the source or
the connection. If noise persists, the problem is
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 KT66/88s should be held by the base when
removing, to prevent damage) numbering them
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 be re-configured for
110/120v ac by a qualified engineer. Contact for
more information.
6 Specification & Features
(Typical conditions @ 240v 50Hz)
KT66/88 output valves or eqv (6550)
12AX7 (ECC83) double triodes for first stage
12AT7 (ECC81) 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)
45w RMS (30w KT66) per channel Ultralinear
20w RMS (15w KT66) per chan Triode mode
Signal to noise level -90db
Freq response 20-20khz +or- 1db
Power bandwidth 10hz-30khz
0.2%
THD
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,
135watts
1.6 amp rear fuse (with spare)
320W, 250D, 180H, 15kg
IEC mains lead, (5amp fused)
CE
certified
Specification subject to change without notice.
