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If you identify a noisy LH/RH 6SN7 it will usually be
quiet in the centre position.
The right and left 6SN7s should be matched. The
centre valve is not critical so this could be a different
type.
We would recommend that Icon Audio supply
replacement valves as they will be tested and
checked in an LA4 to ensure continued high
performance.
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.
Although the three 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. The LA4 may also be returned for
upgrades including the superb Mundorf silver/gold in
oil capacitors which take the performance to a higher
level. Ask us for more information.
GZ34/5AR4 and 274B valves
The GZ34/5AR4 are generally very reliable and long
lived. The 274B (also 5R4) as they age may suffer
internal arcing at switch on as they get older and
should be replaced.
The 5U4/GZ37 are not suitable for the LA4.
CAUTION!
Valves get hot and contain dangerous high voltages.
Do not touch during use.
Never operate with valves rempved.
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 & Features
•
No printed circuit board
•
Japanese ALPS volume pot.
•
All Triode design
•
Valve rectifier, 274B/5AR4/GZ34
•
Twin choke power supply
•
3x 6SN7 Double triode (or CV181 6N8)
•
Signal to noise level -90db
•
Infra red remote control, volume up/down, mute
•
Freq response 10hz-30khz +0 - 0.1db
•
THD 0.01%, @ 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 in oil (option)
•
Wired with silver PTFE audiophile cable
•
Rubicon/Nichichron power capacitors
•
Inputs, CD, Tape, Tuner, Aux, Phono (line level)
•
Ceramic valve holders for minimum leakage
•
DC heater power supply for minimum noise.
•
Gold plated Input & output terminals
•
Tape monitor circuit
•
Max Gain= 12db (input voltage x4)
•
Output impedance 38 ohms
•
Maximum output 30 volts (OUT1 & 2)
•
Optional safety guard
•
Transformers & choke resin sealed to minimise
noise & hum.
•
230/240volts, 35watts 1A anti-surge fuse
•
110/120volts 35 watts 2A anti-surge fuse
•
IEC mains lead, (5amp plug fuse if fitted)
•
FCC, C E certified. ROHS & WEEE compliant
•
250W, 370D, 230H with 274B (or 175 with
GZ34) 12kg packed. Allow for rear
connections &
ventilation)
(Specifications subject to change, errors & omissions excepted 28/05/20)
icon Audio
(UK) Ltd
351 Aylestone Road Leicester LE2 8TA UK
Phone +44 (0) 116 244 0593
44 (0) 7787 158 791
