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6 Specification & Features
4x EL84 output valves or equivalents
1x 12AX7 (ECC83) Triode for first stage
2x 12AU7 (ECC82) Triodes for phase-splitter
No printed circuit board
Dedicated Headphone output (8-600Ω)
Ceramic valve bases for low noise/leakage
HT delay circuit to protect cathodes (option)
Soft start fitted to protect vital components
All hand wired point to point method
15 Watts RMS per channel (8 ohms)
Speaker suitability 3-15 ohms
Class AB operation
Signal to noise level -90db
Freq response 10-50khz +or- 0db @1w
Freq response 30-20khz +or- 1db @10w
4 to 8 ohms speaker matching (6 optimum)
Low Distortion Tertiary transformers
Long grain iron transformers
Supplied with attractive safety guard
Minimal feedback used
Ultralinear transformer
High quality metal film & wire wound resistors
High quality polypropylene audio caps
Japanese 'Blue' ALPS volume pot.
Nichicron/Rubicon power caps.
Silver PTFE internal audio wiring
Gold plated Input & speaker terminals
Inputs for CD, Tuner, Aux
250mv sensitivity for full output
230/240volts, 100watts
Rear Fuse: 1.6A (230v). 3A (115v) 'T' or 'AS'
Size 270W, 256D, 160H, allowance should be
made for adequate ventilation.
8 Packing Instructions
It is essential that the original box and packing
be kept in good condition, as this provides
vital protection during transit. Please do not
write on box, but use removable labels. If
returning for service do not send the cover, as this
is easily damaged. If you are sending the cover
place the amplifier in a plastic bag and wrap
packing tape around the amplifier as shown in
order to "clamp" the cover down firmly. This
minimises damage if the amplifier is not kept
upright.
Re-use the supplied plastic bag to keep
the amp clean and free from damp.
Weight 9.5kg
IEC mains lead, (3amp fused UK only)
CE certified
(Typical, but may vary slightly with valves and mains voltage)
Specification subject to change without notice.
7 Valve Replacement
No special procedure or set up is involved. Switch off
and unplug before attempting. The EL84s are "Self
Bias" so no adjustment is necessary. As the valves
used in the Stereo 20 are easily available and
reasonably priced it is worthwhile investing in quality
replacements. Only fitted the designated types as
others may damage the amplifier and cause high
voltages to be present at the input terminals. We
would recommend that the EL84s and the 12AU7s
be replaced as sets.
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. We would
expect around four years life, but valves may last
considerably longer than this although at reduced
output. 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 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).
The mains lead fits in a foam cut-out
underneath the amplifier.
Insert the piece of cardboard between the
transformer cover and the valve guard;
this
will
prevent
scratching the transformer paintwork.
Valves should be removed, numbered and
packed in "Bubblewrap" or similar for
protection inside the valve cover.
If the amplifier is stored in the box, keep
upright.
icon Audio
351 Aylestone Road Leicester LE2 8TA
sales@iconaudio.com www.iconaudio.com
Phone +44 (0) 116 244 0593 +44 (0) 7787 158791
This amplifier is designed for normal domestic hi fi use. It is not guaranteed
for commercial, Public Address use, or use in other situations.
The supplied packaging will provide essential protection during storage
shipping or service return. It will probably also increase the second hand
value. We would suggest that this be retained wherever possible.
Do not write on box, but use removable labels
2010-12-01 G EU version
the
valve
guard
(UK) Ltd
Page 6
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