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Instruction Manual Covering:
Stereo 40 MK IV 6L6
Contents
1 Introduction & Final Inspection
2 Quick Set Up Guide
3 Connecting inputs & outputs
4 Getting the best out of your amplifier
5 Trouble Shooting
6 Bias Checking & Valve Replacement
7 Specifications
8 Packing and Shipping
1 Introduction
Thank you for purchasing the
Stereo 40 MK
IV.
6L6. This version of the amplifier is specifically
designed to use the 6L6 family of output valves
which includes 6L6, KT66, 5881, 6P3 and
equivalents. The circuit is virtually the same as the
more powerful Stereo 40 KT88 but with lower
power and less features.
The Stereo 40 was first introduced in 2000 since
then it has undergone many refinements and
upgrades which make it one of the finest
amplifiers in its class capable of very high
definition when used with high quality input
material and loudspeakers.
In order to get the best out of your amplifier,
please read the enclosed notes thoroughly. 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 Icon Audio or your agent for advice.
Valve (or Tube) amplifiers do the same job as a
solid state amplifier, but are very simple and have
a warmer, more pleasing sound. Your ears will
have become accustomed to your old amplifier, so
it may take some hours before your ears attune
themselves to the new sound. Also allow for a
“Burn in” period which may take up to several
months.
Setting up:
You will need at least one source such as CD,
Digital Streamer, Phono preamp etc, a pair of
suitable
loudspeakers,
interconnects,
and
loudspeaker cables. (See section 2)
Site the amplifier where it will have adequate
ventilation away from heat sensitive materials.
Larger more efficient loudspeakers will give a
higher volume and deeper bass (90dB or more).
Some experiment may be needed to get the best
effect. Make sure that the loudspeakers are “in
phase” by checking the polarity at both ends of
the loudspeaker cable.
Your source, loudspeakers and room acoustics
will also affect the sound.
Setting up and judgements should be made with a
‘clean’ well balanced recording.
The Stereo 40 MK IV is a push-pull Ultralinear
stereo amplifier, using fixed bias. The driver and
phase splitting is all triode. The pre-amp is a high
quality ‘Passive’ circuit using high quality audio
cable and an ALPS volume control. It is sensitive
enough to be used with all modern source
equipment. Its simplicity coupled with point to
point hand wiring all add up to give exceptional
listening performance.
IMPORTANT!
THIS MANUAL CONTAINS
ESSENTIAL HEALTH & SAFETY
INFORMATION FOR YOU AND
YOUR AMPLIFIER. PLEASE
READ & KEEP SAFE AND
REFER TO IF NECESSARY
DRAFT COPY
May Contain errors!
With 6L6 & CV181
With 6P3 & 6SN7
