Goldmund TELOS 150 User manual

USER MANUAL
GOLDMUND TELOS 150
Analog Power Amplifier

INTRODUCTION
GOLDMUND TELOS 150 Analog Power Amplifier
Congratulations.
Thank you for purchasing the Goldmund Telos 150.
You have acquired one of the best Analog Power Amplifier ever made for professional and domestic
uses. Please take some time to read this manual. It will provide you with useful information to make
your pleasure of listening to the Telos 150 even higher.
Goldmund was founded in 1978 and has ever since been dedicated to the accurate reproduction of
sound and image.
At Goldmund, we strive to lead in the creation, development and manufacture of the industry’s most
advanced technologies, including audio and video systems, home-networking and music distribution.
The guiding principle at Goldmund is to produce a precise sound with the least possible loss of quality
through the different stages. Goldmund will never adopt a technology before it is sufficiently developed
to satisfy the high quality standards we set. This is why Goldmund has often rejected mainstream
technologies and developed its own.

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User manual – Telos 150 Analog Power Amplifier
W A R N I N G
No connection or manipulation must be
done before reading those instructions.
Damage of the amplifier may result if the
following instructions are not consciously
understood and applied.
This extremely high quality amplifier pos-
sesses new technical features which are
a necessity for accurate sound reproduc-
tion in the best audio systems.
Only careful installation and use
can provide the satisfaction you are
expecting.
The installation instructions must be car-
ried out in full and the mentioned pre-
cautions taken to get the expected result
and to avoid impairing the amplifier’s
performance.
!

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User manual – Telos 150 Analog Power Amplifier
1UNPACKING 5
2CHOICE OF AMPLIFIER LOCATION AND COOLING 5
3LINE VOLTAGE ADJUSTMENT 6
4CONNECTIONS 6
5AMPLIFIER CONTROLS 7
6SOUND QUALITY OPTIMIZATION 7
7SAFETY AND PRECAUTIONS 9
8MAINTENANCE 9
9TECHNICAL DATA 10
CONTENTS

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User manual – Telos 150 Analog Power Amplifier
1UNPACKING
You will find in the Goldmund Telos 150 box:
The amplifier
The power cord
This manual and the warranty card
Accessories and spare fuses.
Unpack the above-mentioned parts carefully.
Please keep the packaging in case you need to transport the amplifier at a later date or if
you have to send it for maintenance.
2CHOICE OF AMPLIFIER LOCATION AND
COOLING
The Goldmund Telos 150 Amplifier, as all the high quality amplifiers, may generate a large
amount of heat if driven at high power.
It is mandatory to allow a proper cooling of the heat sink.
Avoid any location which is not properly ventilated and avoid putting other equipment on top
of the amplifier.
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ATTENTION: If you need to return the
Telos 150 to the factory or to your local rep-
resentative for a warranty repair, please note
that it must be repacked in the original
packaging.
This packaging has been designed specifi-
cally to protect your Telos 150 in transit. Use
of alternative packaging is likely to result in
damage, invalidating warranty cover.

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User manual – Telos 150 Analog Power Amplifier
3LINE VOLTAGE ADJUSTMENT
An AC line voltage selection is possible on the rear panel. Please choose the setting corre-
sponding to your voltage.
Please check the value of the mains line fuse. This fuse is located in the power cord receptacle.
The lid can be removed with a small screwdriver when the cord is removed.
Use a 8 A slow-blow fuse.
4CONNECTIONS
Check if volume control is down to zero on the preamplifier.
Connect the analog outputs of your analog preamplifier to the analog inputs of the Telos 150.
Connect the speaker cables to the red and black terminals accessible at the back of the
amplifiers.
You may notice that the ground of the input and the black speaker terminal are of the same
polarity. The amplifier is non-inverting in phase.
Then, connect the power cords to the back of the amplifier and plug it in the nearest wall plug.
Use a 3 lugs grounded plug, for safety reasons. To get the best sound of the amplifier, avoid
any multiple plug or extension cord.
ATTENTION: On the 220 V position, the
Goldmund Telos 150 amplifier will func-
tion properly for AC voltages between 200 V
and 245 V. On the 110 V position, the AC
line must deliver between 95 V and 125 V.
If your AC line is usually out of these toler-
ances, please consult your local Goldmund
dealer.

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User manual – Telos 150 Analog Power Amplifier
5AMPLIFIER CONTROLS
On the front plate of the Goldmund Telos 150 Amplifier you will find only one switch: the
“POWER” key, used to power the amplifier ON and one power LED.
When turned ON the 2 channels are immediately connected and the front panel “POWER” LED
lights up.
The amplifier may be powered OFF by turning off the “POWER” switch at any time. The LED will
fade very slowly, indicating discharge of the filter capacitors. The speakers will be disconnected
after a few seconds.
It is absolutely normal that a slight sound is heard from the speakers when the amplifier is
turned ON or OFF. The sound heard is corresponding to the charging and discharging of the
capacitors.
6SOUND QUALITY OPTIMIZATION
WARM-UP SONIC EFFECT
If the power amplifier has not been powered on for a few days, the optimum sound quality is
reached after 15 minutes. This delay has been optimized to be minimal and the sonic quality
when just powered on is much higher than other quality power amplifiers.

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User manual – Telos 150 Analog Power Amplifier
6SOUND QUALITY OPTIMIZATION
SPEAKER POLARITY
Even if you have an absolute phase inverter on your preamplifier (Mimesis 22M), and even if
you have carefully selected the proper line phase (see in next section), there is a possibility
to again increase the sonic quality of your speakers by reverting the polarity of each speaker
cable at amplifier termination. But since the line phase and the speaker polarity interfere to
each other, you have to experiment carefully with all the combinations before picking the right
one.
If your preamplifier has an absolute phase inverter, this will interfere too. If it has not, don’t for-
get the result will depend on the source, as most records and CDs have been recorded without
care for the absolute phase. Be patient…
MAINS LINE PHASE INVERSION
The sonic quality of your Goldmund Telos 150 can be greatly improved if the mains AC line is
properly connected. Try to invert the AC plugs of both your amplifiers, using special adapters.
We recommend that you try this carefully. You must do it in combination with the speaker
polarity and/or with absolute phase switching to be sure of the best result.

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User manual – Telos 150 Analog Power Amplifier
7SAFETY AND PRECAUTIONS
PROTECTION AGAINST DC
The Goldmund Telos 150 is a DC-coupled amplifier without protection. If it is associated with
a badly designed or defective analog preamplifier (often true for tube preamplifiers and some
5 channel processors), the speakers could easily be damaged by the DC.
The Telos 150 doesn’t amplify DC but DC applied at the input is passed to the output.
This protection circuit is totally transparent and has no sonic effect.
PROTECTION AGAINST SHORT-CIRCUITS
If one output is short-circuited by accident, the amplifier will source too much current.
Such accident should be limited over time to avoid excessive heat. Build-up occurring.
This is not covered by the warranty.
8MAINTENANCE
The Goldmund Telos 150 amplifier usually requires no maintenance.
To clean your Telos 150 use a very soft, clean, damp cloth to avoid scratching the surface.
Dampen with water or a mild detergent solution. Avoid abrasive or harsh cleansers (e.g. products
containing sodium carbonate).
Always turn the power OFF before cleaning your amplifier.
ATTENTION: the Goldmund Telos 150 is an
extremely high speed amplifier.
Any bad ground connection can generate
high frequency oscillation which is dan-
gerous for tweeters.
It is also generally dangerous to run analog
input cables and speaker cables in parallel
for a long distance. If these cables are not of
high quality or badly shielded, an “Antenna-
Effect” can generate dangerous high-
frequency oscillations.

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User manual – Telos 150 Analog Power Amplifier
9TECHNICAL DATA
POWER
• Maximum power: > 300 W RMS (3 Ω).
• Maximum voltage: 55 V peak.
These values are for both driven channels.
FREQUENCY RESPONSE
These figures are valid for the amplifier operating with a 200 mV RMS input and a 8 Ωresis-
tive load.
• +/- 0.05 dB, 10 Hz-20 kHz.
• +/- 0.5 dB, 10 Hz-200 kHz.
ANALOGUE INPUT SENSITIVITY
• Nominal level: 0.75 V (for 55 W RMS out, 8 Ωload).
• Input impedance: 50 kΩ.
• Voltage gain: 29 dB.
DISTORTION
Measured with a 22 Hz-22 kHz bandwidth and 1 kHz signal.
• Static: THD + N ratio < 0.006 % (65 W RMS, 8 Ωload).
NOISE
• Output noise: < 70 µV RMS unweighted (inputs shorted).
OPERATING TEMPERATURE
• Room temperature: -30 to +40 degrees Celsius (-22 to +104 degrees Fahrenheit).
• Internal temperature: +45 to +65 degrees Celsius ( + 113 to + 149 degrees Fahrenheit).
POWER SUPPLY
• Nominal line voltage: 117 or 234 V.
• Input voltage range: +/- 15 %.
• Maximum power consumption: 600 W RMS.
SIZE AND WEIGHT
• 44 cm W × 33 cm D × 9 cm H.
• 13 kg net.
WARRANTY
• 3 years parts and labor.