Page 6
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.
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.
Valve Problems
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.
Blown Fuse
Each channel has a 500mA. This is very unlikely
to blow unless the amplifier has been misused in
some way or one of the 300Bs is faulty. This will
cause distortion and you should contact either
Icon Audio for replacements or your dealer for
guidance on how to proceed.
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.
LEDs
The front power indicating LED and the 4 blue
LEDs under the chassis are for power indication
and cosmetic reasons only. Should any of these
fail the performance of the amplifier is unaffected.
Should you prefer to have the amplifier working
without the under-chassis LEDs we can supply
information how to disconnect upon request.
Service:
Should you suspect a problem, you
could return the unit to Icon Audio or your dealer
for a periodic service or return the valves for
testing free of charge. You should carefully
remove the valves (the 300Bs 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).
Mains Supply
This amplifier is hard wired to work on 230/240v
ac 50/60hz. Use on a different voltage will require
an appropriate transformer. Contact for more
information.
6 Specification & Features
(Typical conditions @ 240v 50Hz)
•
300B output valves
•
6SL7 (6188) first stage/phase splitter
•
12AT7 (ECC81) push pull output driver
•
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)
•
35W RMS per channel
•
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 potted transformers 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
•
Gold plated Input & speaker terminals
•
Inputs for CD, Tape, Tuner, Aux
•
Tape monitor, buffered
•
300 mv sensitivity for full output
•
230/240volts, 300watts
•
3 amp rear fuse (with spare)
•
460W, 400D, 250H, 36kg (remember to allow
space for connections and ventilation)
•
IEC mains lead, (5amp fused)
•
CE certified
(Specifications subject to change, errors & omissions excepted 11/02/20)
