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Trouble Shooting
When problem solving make sure that the power
amp(s) are switched on and connected both to
speakers and pre-amp.
Amplifier Dead
Check the 1amp mains fuse at the back of the
amplifier. To gain access, remove the mains lead.
The fuse is in a small plastic drawer, which forms part
of the socket assembly. To open insert a flat bade
screwdriver or similar and prise open. The fuse in
use is the innermost the outer is a spare. Should the
replacement fuse also blow there is a fault.
Replacements should be 1Amp 'anti-surge'.
The fuse in the mains plug should be a 3 or 5 amp
fuse, although unlikely, this should be checked if the
amplifier fuse is OK.
No sound
Have you selected the right input? Are the
connections OK? Is everything switched on? Are the
speakers connected?
Distorted sound.
Try another source; if sound improves then it's
probably something wrong with the first source. If no
improvement try different speakers, if no improvement
could be an amplifier problem.
Hum Problems
If you experience hum, try disconnecting all inputs, if
hum persists this is probably an amplifier fault.
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.
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.
channel.
(b) Amplifier or speakers.
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.
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. As the GZ34 and
5Z3 are lightly loaded we would expect a long life. It is
probably replacing the 12AU7/12AX7s after 3-5
years. Icon Audio can test these free of charge. It is
essential that only the correct valves are used as
some similar looking valves have a different pin
Sound will move to the other
Sound will not move.
connection and insertion could result in damage
to the amplifier and risk of electric shock. 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 they should be
well packed in cardboard & foam or similar, and
returned to Icon Audio for testing. (Valves are very
rugged if packed properly).
Specification & Features
•
No printed circuit board or tag board
•
Japanese Blue ALPS volume pot.
•
All Triode design
•
Valve rectifier, 5AR4 (GZ34/32) 5Z3 274 (max 2a 5v)
•
Choke regulated power supply
•
2x 12AX7 (ECC83) Double triode
•
1x 12AU7 (ECC82) Double triode
•
Signal to noise level -90db
•
Freq response 10hz-30khz +0 - 0.1db
•
Total harmonic distortion 0.001%
•
Japanese EI transformers with low oxygen copper
•
Hand wired point to point components
•
High quality 2w metal film, & wire-wound resistors
•
Blue LED mains indicator
•
Audio grade Polypropylene audio capacitors
•
Internal audio wiring using audiophile grade silver
cable
•
Black Diamond/Rubicon power capacitors
•
Inputs, CD, Tape, Tuner, Aux, Phono (pre amp)
•
Ceramic valve holders for minimum leakage
•
Centre tapped heater circuit for minimum hum
•
Pre-amp 6.3v heater circuit floated at 60v to minimise
heater-cathode leakage
•
Polished stainless steel chassis
•
10mm solid aluminium front plate
•
Crackle finish enamel painted transformer cover
•
Gold plated Input & output terminals
•
Tape monitor circuit
•
Gain = 8x or 18db
•
Maximum output 20 volts for 2.5v input
•
Output Impedance 250 ohms
•
Supplied with attractive safety guard
•
Transformers & choke resin sealed to minimise
mechanical noise & hum.
•
230/240volts, 35watts 1A anti-surge fuse
•
IEC mains lead, (5amp fused)
•
C E certified
•
220W(280), 180H(210) 360D(430) 8.5kg with 5Z3
180H(210) (figures in brackets allow for rear
connections & ventilation)
(Specifications subject to change, errors & omissions excepted 11/02/20)
icon Audio
351 Aylestone Road Leicester LE2 8TA
www.iconaudio.com
sales@iconaudio.com
Phone 0116 244 0593 07787 158791
Ltd
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