Goldmund TELOS 280 User manual

USER MANUAL
GOLDMUND TELOS 280
Stereo Analog Power Amplifier

GOLDMUND Telos 280 – ANALOG POWER AMPLIFIER - 2
Thank you for purchasing the GOLDMUND Telos 280. The Goldmund Telos line amplifiers fully
incorporate the technological expertise developed by our company throughout the years.
Please take some time to read this manual. It will provide you with useful information to make your
pleasure of listening to the Telos 280 even higher.
INTRODU TION
GOLDMUND TELOS 280 - Analog Power Amplifier
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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Table of ontents
1 UNPA KING 5
2 HOI E OF AMPLIFIER LO ATION 5
3 LINE VOLTAGE 6
4 ONNE TIONS 6
5 AMPLIFIER ONTROLS 7
6 SOUND QUALITY OPTIMIZATION 7
6 SOUND QUALITY OPTIMIZATION ( td.) 8
7 SAFETY AND PRE AUTIONS 9
8 MAINTENAN E 9
9 TE HNI AL DATA 10

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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.
These extremely high quality amplifiers possess
new technical features which are a necessity for
accurate sound reproduction in the best audio
systems.
Only careful installation and use can provide the
satisfaction you are expecting.
The installation instructions must be carried out in
full and the mentioned precautions taken to get the
expected result and to avoid impairing the
amplifier’s performance.

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1 UNPA KING
You will find in the Goldmund Telos 280 box:
•The amplifier
•The power cord
•The owner’s manual
Unpack the above-mentioned parts carefully.
ATTENTION: If you need to return the Telos 280 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 specifically to protect your Telos 280 in transit. Use
of alternative packaging is likely to result in damage, invalidating warranty cover.
2 HOI E OF AMPLIFIER LO ATION
The Telos 280 is built by Goldmund using the best known technology of noise and
vibration cancellation (Goldmund “Mechanical Grounding”) to insure a very silent and
vibration free operation.
The Goldmund Telos 280 Amplifier, as all the high quality amplifiers, may generate a
large amount of heat if driven at high power.
Locate your Telos 280 in a reasonably well ventilated location. When powered on, the
Telos 280 generates a significant amount of heat which has to be evacuated by natural
ventilation.

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3 LINE VOLTAGE
The Goldmund Telos 280 amplifier is preset at the factory for your country's voltage.On
the 230V position, the Goldmund Telos 280 amplifier will function properly for main line
voltage between 190V and 245V. On the 115V position, the main line must deliver
between 95 and 125V. If your main line is usually out of these tolerances, please consult
your Goldmund dealer.
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 8A slow-blow fuse.
4 ONNE TIONS
Check if volume control is down to zero on the preamplifier.
You have two possibilities to connect your Power Amplifier:
• Connect the analog RCA output of your analog preamplifier to the analog RCA input of
the Goldmund Telos 280.
• Connect the analog XLR output of your analog preamplifier to the analog XLR input of
the Goldmund Telos 280.
Connect the speaker cables to the red and black terminals accessible at the back of the
amplifier.
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 multiple plugs or extension cords.
ATTENTION:
The Telos 280 does not have an input
selection switch. Only one input can be
used at once.

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5 AMPLIFIER ONTROLS
On the front plate of the Goldmund Telos 280 amplifier you will find only one switch used
to power the amplifier ON and one green power LED.
When turned ON the 2 channels are connected after a few seconds 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 almost immediately.
6 SOUND 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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6 SOUND QUALITY OPTIMIZATION ( td.)
Speaker polarity
Even if you have an absolute phase inverter on your preamplifier, 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 forget 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 280 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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7 SAFETY AND PRE AUTIONS
Protection of the circuit
The Goldmund Telos 280 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 280 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.
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.
8 MAINTENAN E
The Goldmund Telos 280 amplifier usually requires no maintenance.
To clean your amplifier, 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 280 is an
extremely high speed amplifier.
Any bad ground connection can generate high
frequency oscillation which is dangerous 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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9 TE HNI AL DATA
POWER RATING:
•Nominal Line Voltage 117 ; 234V
•AC line range: 10%
•Fuse 8A for 115 and 230V
•2 toroidal transformers
•Separated ground and earth signal
•Connection between earth and ground to cancel all ground loops
OUTPUT POWER:
•Power RMS (Goldmund FPP Standard): 320 Wrms on 8 Ω.
•Maximum power (IEC60065): 2 x 215 Wrms on 8 Ω/ 1%THD
•Rated Power Consumption (IEC60065): 70 W
DISTORTION:
With 20 Vrms output level
•IMD < 0,04%
BANDWIDTH:
•20Hz – 20KHz: +/-0,2dB on 8 Ω.
•+/- 3dB: 0Hz - >200KHz on 8 Ω.
SLEW RATE:
•8V/µS
AMPLIFIER GAIN:
•35dB
INPUT:
•Maximum input sensitivity: 1Vrms
NO- LIPPED OUTPUT VOLTAGE:
•Maximum voltage: 153Vpp