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icon Audio LA 5TX User Manual

icon Audio LA 5TX User Manual

Pure valve line pre-amplifier

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The LA5TX is a very special pre-amplifier. Despite
looking like a valve pre-amplifier, it is in fact designed
around two very high quality transformers which have
a simple low gain valve stage to act as a "buffer".
This way the impedance of the source unit and the
input
of
the
power
separated.
The
Transformers
uniquely wound Low Distortion Tertiary winding,
complex and time consuming to get right, but
preserving the smallest musical detail and dynamics
without the problems associated with capacitor
coupling.
To get the best out of the LA5TX. Please read the
enclosed notes. We have tried to give you all the
information you need. We would recommend that
everyone follows the 'quick set up guide'. Should
you be uncertain about anything to do with your
LA5TX please contact your dealer.
The
LA5TX
is
a
line
complement high quality valve or transistor power
amplifiers requiring an input voltage of 1volt or
greater. It will also work well with most integrated
amplifiers.
Our philosophy is to use traditional valve minimalist,
circuitry. The beauty of valve amplifiers is that they
are usually very simple; therefore with the use of
traditional point-to point construction, modern high
performance low tolerance components, it is possible
to achieve very high sonic performance. This
simplicity enables us to avoid the use of printed
icon Audio
LA 5TX
Pure Valve Line Pre-amplifier User Manual
About the LA 5TX
amplifier
are
completely
incorporate
amplifier
designed
circuit boards, which are not ideal for valve amplifiers
despite their common use.
Although technical performance is important, we
never forget that sound quality takes overriding
priority in our design and production. The LA5TX has
a massive overload capability and even then would
go into 'soft clipping', which is much more benign and
our
easier on the ear than overloaded transistors.
The simplicity of the circuit means that there are
much fewer components for the signal to pass
through, fewer connections and switches, again
adding to the purity of sound. This simplicity also
means that we can use higher quality oversized
components, such as 2w resistors.
The use of popular valves, which are still in
production, means that obtaining replacements is
easy and inexpensive when necessary.
In the process of building the LA5TX to its high
to
standard no corners have been cut and we have also
paid close attention to the appearance.
The remote control has its own separate power
supply so the operation will not influence sonic
qualities.
The final result is an amplifier with excellent
characteristics, with an accurate yet smooth and
transparent quality.
Various upgrades are available at the time of
ordering or may be retro fitted. These include
"Mundorf" capacitors and various valves including
"Full Music" which will enhance the performance of
the LA5TX.
IMPORTANT!
THIS MANUAL CONTAINS
ESSENTIAL HEALTH &
SAFETY INFORMATION FOR
YOU AND YOUR AMPLIFIER.
PLEASE READ & KEEP SAFE
AND REFER TO IF NECESSARY
Page 1

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Summary of Contents for icon Audio LA 5TX

  • Page 1 YOU AND YOUR AMPLIFIER. PLEASE READ & KEEP SAFE AND REFER TO IF NECESSARY About the LA 5TX The LA5TX is a very special pre-amplifier. Despite circuit boards, which are not ideal for valve amplifiers looking like a valve pre-amplifier, it is in fact designed despite their common use.
  • Page 2: Final Inspection

    Final Inspection This amplifier has been carefully checked, tested and final adjustments made by Icon Audio in Leicester. It has passed our rigorous listening test and final inspection to assure you of optimum performance and reliability. …./…./…. Date ………. Model ……….
  • Page 3 LA5TX layout Care should be taken to site the pre-amplifier away from sources of hum e.g. from the power transformers of other units, particularly power amplifiers. All inputs and including the tape loop are at the same level. Outputs 1 and 2 are at the same level. CV181 is identical to the 6SN7 Page 3...
  • Page 4: General Points

    QUICK SET UP GUIDE 1 Unpack unit carefully. Make sure that it is in good Remove batteries during storage to prevent leakage condition. It is important that you keep packaging for damage. Spares and repairs are available from Icon warranty/service return. Audio (at time of writing 12/2012) 2 Fit the rectifier valve 274B (or GZ34/5AR4) Connecting inputs &...
  • Page 5: Troubleshooting

    OK. Service: Should you suspect a problem, you could No sound return the unit to your dealer or Icon Audio for a Have you selected the right input? Are the periodic service or return the valves for testing free of connections OK? Is everything switched on? Are the charge.