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Instruction Manual Covering: 

 

Stereo 40i Classic 

EL34 versions 

 

KT88 Version pictured 

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 Specifications 

 

7 Valve Replacement  

 

8 Guarantee 

 

9 Packing Instructions 

 

1 Introduction 

 

Thank you for purchasing the 

Stereo 40i 

Classic

. This new upgraded model benefits 

from a Choke regulated power supply for an even 
smoother sound plus several other circuit 
improvements. 
In order to get the best out of your amplifier, 
please read the enclosed notes. Even if you are 
experienced with hi fi. 

We would recommend 

that everyone follow the ‘quick set up guide’. 

Should you be uncertain about anything to do with 
your amplifier please contact your dealer, or 
ourselves 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. So setting up and judgements 
should be made with a ‘clean’ well balanced 
recording. Time should also be allowed for the 
amplifier to “burn in”, this applies not only to the 
valves but also capacitors and resistors etc. We 
are aware this can be several months depending 
upon your pattern of use. Generally the sound will 
become more relaxed and cohesive. 
The 

Stereo 40i 

is a push-pull Ultralinear 

stereo power amp, capable of running in either 
“ultralinear” or pure triode mode, using the EL34 
valves in fixed bias mode. The driver and phase 
splitting is all triode. The pre-amp is a high quality 
‘Passive’ circuit using silver 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. Its 
simplicity coupled with “point to point wiring” “hard 
wiring without” the use of printed circuit boards 
results in an open euphoric sound that is 
wonderfully detailed and warm sounding.  
 

Summary of Contents for Stereo 40i Classic EL34

Page 1: ...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...

Page 2: ...our test Check inputs tape monitor Output Valve Bias level mv Sound Quality Channel Balance Valve Microphony Valve Seating Hum level left right mv RF Test LED brightness Serial No sticker and recorded...

Page 3: ...thode heaters With the volume control set to minimum fully anti clockwise there should be no sound coming from the speakers except a barely discernable gentle hum If there are any unpleasant sounds co...

Page 4: ...n longer cables You can either hard wire your cable to the amplifier by baring enough cable to fit in the connector and twist together to avoid any spare strands touching anywhere else soldering the s...

Page 5: ...ssarily We would always advise that any item of home electronics is switched off when not in use Burning in Although the amp should sound good within about 10 mins it can take up to an hour to sound a...

Page 6: ...event damage 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 t...

Page 7: ...and damaging to the amplifier Health safety High voltages are present inside the amplifier and on exposed valve sockets when valves are removed so take suitable care It is not necessary to remove the...

Page 8: ...her situations The guarantee becomes void if the unit has been modified in any way not approved by Icon Audio 9 Packing Instructions It is essential that the original box and packing be kept in good c...

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