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Ultralinear Push Pull Amplifier EL34 or KT88
IMPORTANT!
THIS MANUAL CONTAINS
ESSENTIAL INFORMATION
FOR THE HEALTH & SAFETY
OF YOUR AMPLIFIER. PLEASE
READ & KEEP SAFE AND
REFER TO IF NECESSARY
1 Introduction & Final Inspection
Thank you for purchasing the
A great deal of care has been taken in the design,
selection of components and production of this
amplifier. We are sure that you will hear the
difference.
In order to get the best out of your amplifier,
please read the enclosed notes. Even if you are
experienced with hi fi please read the 'quick set
up guide'. Should you be uncertain about
anything to do with your amplifier please contact
us for advice.
Hi fi reproduction is a long chain of events that
includes the recording, editing, mixing etc, before
being transferred to a medium such as LP, CD, or
FM, before being played through your own source
unit, the amplifier and finally loudspeakers.
Your room acoustics will also affect the sound
before it finally reaches your ear. Whilst the
amplifier is arguably the most important part of a
system, it is important to remember that the
weakest link will always affect the final results
when making judgements. And not all recordings
are 'equal'! Therefore an amplifier which faithfully
reproduces the input signal will also reproduce
imperfections in the tonal balance and the
recording
itself.
Therefore
icon Audio
Instruction Manual Covering:
Stereo 25 MK II
Contents
1 Introduction
Stereo 25
.
setting
up
and
Standard version with KT88s
8 Specifications
9 Guarantee
judgements should be made with a 'clean' well
balanced recording.
Stereo 25
The
stereo power amp, capable of running in
Ultralinear mode (half pentode and half triode).
Using the excellent 6L6/EL34/6CA7/KT66/KT88
valves. These are in semi auto-bias mode which
whilst rarely requiring attention gives maximum
power, cool running and wear indication. The
driver and phase splitting is all triode for best
sound quality and low noise. The pre-amp is a
high quality 'Passive' circuit using silver PTFE
audio cable and an ALPS 'blue' volume control. It
is sensitive enough to be used with all modern
source equipment having an output of 300mv or
greater. It may also be used as a power amplifier
being driven by a separate pre amplifier. Its
simplicity coupled with point to point hand wiring
without the use of printed circuit boards results in
an open euphoric sound that is wonderfully
detailed and warm sounding. The overall design is
inspired by the Leak Stereo 50 design. The wide
range of output valves that is capable of using
make
it
extremely
versatile
customise it to your own taste. Recommended
upgrades are Jensen Copper foil in paper and oil
capacitors and various output and driver valves.
is a push-pull Ultralinear
and
you
can
Page 1
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Summary of Contents for icon Audio Stereo 25 MK II
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Page 1: Table Of Contents
Audio Instruction Manual Covering: Stereo 25 MK II Ultralinear Push Pull Amplifier EL34 or KT88 IMPORTANT! THIS MANUAL CONTAINS ESSENTIAL INFORMATION FOR THE HEALTH & SAFETY OF YOUR AMPLIFIER. PLEASE READ & KEEP SAFE AND REFER TO IF NECESSARY... - Page 2 Final Inspection - Your Guarantee of Quality To assure you of optimum performance and reliability, this amplifier has passed our rigorous final inspection and listening test by the Icon Audio team in Leicester . During which the final set up and adjustments were made.
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Page 3: Quick Set Up Guide
1 Unpack unit carefully. Make sure that it is in except a barely discernable gentle hum. If there good condition. If not report to Icon Audio. It is are any unpleasant sounds coming from the speakers, switch off and refer to the ‘Trouble... -
Page 4: Connecting Inputs & Outputs
“back off” the volume no more than necessary. If hear more, or less bass. The higher bass output is you still have too much gain Icon Audio can the correct setting to use. Another alternative is to modify the sensitivity to your specification. The use a test disc. -
Page 5: Getting The Best Performance
Icon. fuse also blow there is a fault you should disconnect Hum Problems from the mains and seek qualified help or Icon Audio. If you experience hum, try disconnecting all inputs, if Replacements should be ‘anti-surge’ or “T” (for time), hum persists this is probably an amplifier fault. -
Page 6: Bias Adjustment
Service: Should you suspect a problem, you could about 10%. There is no provision to adjust individual return the unit to Icon Audio for a periodic service or valves, which is not necessary on the ST25. return the valves for testing free of charge. You should... - Page 7 “double Icon Audio are happy to check the valves/amp or glow” inside. We are able to provide telephone your re-bias your amp free of charge.
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Page 8: Packing Instructions
10 Packing Instructions It is essential that the original custom box and This amplifier is guaranteed by Icon Audio or the packing be kept for shipping as this provides UK dealer you purchased from for 12 months vital protection during transit.