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Trouble Shooting
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 too 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.
As the LA5TX is transformer based it will be sensitive
to positioning rather like MC phono transformers. So
care should be taken to site it away from power
transformers (as in power amplifiers) to minimise
noise. Although some small transformers found in CD
players for example can have surprisingly large hum
fields. These exist both above and below, as well as
side to side.
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 2)
Valve life will depend upon such things as hours of
use and number of on/off cycles. As all the valves are
lightly loaded we would estimate life of approx 4 to 10
years. It is essential that only the correct valves
are used as some similar looking valves have a
different pin connection and insertion could result
in damage to the amplifier and risk of electric
shock. It is not good practice to remove the valves
Sound will move to the other
Sound will not move.
unnecessarily as this can strain the pins and cause
tiny air leaks. Icon Audio are happy to replace valves
and check to performance of your amplifier, and
advise on the latest upgrades available.
Although the two original 6SN7 valves are normally
identical it is important that if they are removed, that
they are replaced in the same position. We normally
number them.
Equivalent Valves
Designed for 274B (8 pin octal version). The GZ34,
5AR4 will also work well.
Designed for 6SN7. CV181 is identical, as is Russian
or Chinese 6H8c (6N8p).
Service: Should you suspect a problem, you could
return the unit to your dealer or 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
•
No printed circuit board or tag board
•
Japanese Blue ALPS volume pot.
•
All Triode design
•
Valve rectifier, 274B (or GZ34) with
•
Twin choke power supply
•
2x 6SN7 Double triode
•
Signal to noise level -80db
•
Infra red remote control, volume up/down, mute
•
Freq response 20hz-15kHz +0 - 0.5db
•
Freq response 13Hz-20kHz +0 -1db
•
Freq response 7Hz-28kHz +0 -3db
•
THD typically less than 0.18%, @ 1khz, 2v rms
•
Hand wired point to point components
•
High quality 2w metal film resistors, for audio
•
LED mains indicator
•
Audio grade Polypropylene audio capacitors
•
Mundorf silver/gold oil caps (signature version)
•
Wired with silver PTFE audiophile cable
•
Rubicon/Nichichron power capacitors
•
Inputs, CD, Tape, Tuner, Aux, Phono (line level)
•
Audiophile PTFE valve holders
•
DC heater power supply for minimum noise.
•
Gold plated Input & output terminals
•
Tape monitor circuit
•
Max Gain= 8db or x2.5
•
Output impedance 250 ohms
•
Maximum output 20 volts
•
Transformers & choke resin sealed to minimise
noise & hum.
•
220/240volts, 75watts 1A anti-surge fuse
•
IEC mains lead, (5amp fused)
•
C E certified
•
345W, 310D, 195H with 274B (or 170 with
GZ34) 18kg packed. Allow for rear
ventilation)
(Specifications subject to change, errors & omissions excepted 19/02/20)
icon Audio
351 Aylestone Road Leicester LE2 8TA UK
www.iconaudio.com
Phone +44 (0) 116 244 0593
Mobile +44 (0) 7787 158 791
& Features
connections &
(UK) Ltd
Page 5
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