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Owner’s
Manual
SUONO
25W Class A Single Ended Power Amplifier
www.lab12.gr
manual v1.3
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LAB12 SUONO 25W Class A Single Ended Power Amplifier
Table of Contents
It is yours
Features
Installation & Placement
Suono Tubes Position
Front Panel
Rear Panel
Main connections
Bias Setting
For the safety of your equipment
Specifications
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LAB12 SUONO 25W Class A Single Ended Power Amplifier
IT IS YOURS!
Thank you for selecting the LAB12 SUONO, an audiophile Class A power amplifier. Every component on it
is designed to provide smooth and untreated sound. It is a full tube amplifier with 6n2p NOS Russian
driver tubes and KT150 on power stage. Suono can cooperate gratefully with any preamplifier on the
market and it is the perfect match for PRE1. Suono has the ability to nail you down on your couch and
make you listen all your music collection again. Full power for your speakers is here but the most
remarkable point is that you will receive a fluid, wide and addictive consonant sound with any choice of
music style. All components are carefully chosen after hours of listening and testing, while paying great
attention to every detail affecting the final outcome. As every lab12 device, Suono has an ultra-solid
construction with handcrafted finishing, luxury automotive metal paint and retro analogue V/U meters.
Do not forget that your Suono is totally handcrafted with perfectly matched parts of the finest
selections. You have to know that to reach the optimal performance your Suono need at least 200 hours
of listening. In this time all components go from “burn in” period to stable.
Before setting up your new Suono, we encourage you to read this manual thoroughly to properly
acquaint yourself with its features. We love music and audio devices, we build your new device with
emotion and personal treatment.
The information contained in this manual is subject to change without notice. The most current version
of this manual is available on our official website at http://www.lab12.gr
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LAB12 SUONO 25W Class A Single Ended Power Amplifier
Features
• KT150 matched tubes
• Manual Bias Adjustment
• Triode / ultra linear selector switch
• Handcrafted custom audio grade transformers
• No feedback design
• High power transformer
• Special audio grade matched parts in every stage
• SRSG® implementation
• Fine symmetry® implementation
• Gold plated teflon rca connectors
• Gold plated tube sockets
• Analog retro nissei VU meters
• 5mm aluminum face panel with luxury painting
• Five years guarantee
Installation & Placement
The LAB12 Suono should be placed on a solid flat surface.
You should avoid placing it near a heat source as this could compromise the Suono performance and
reliability.
Carefully put the tubes in dedicated sockets. Make sure that tubes are perfectly snap in to sockets. See
bellow page.
Due to high power tubes design, Suono chassis could be hot so you should never place another hot
component directly near this device. Make sure the device has enough space to ventilate.
Tubes will be hot, this is normal. Be careful not to touch the tubes during the operation to avoid any
injuries.
Take care of the finest luxury finish of front panel with a soft cloth.
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LAB12 SUONO 25W Class A Single Ended Power Amplifier
Suono Tubes Positions
Insert tubes carefully in each position. All tubes are marked with position number was placed during
calibration and burn in of Suono.
All in box tubes are perfectly matched during calibration to achieve a perfect balanced operation.
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LAB12 SUONO 25W Class A Single Ended Power Amplifier
Front Panel
SUONO
Front pane
At front panel you will see three indication LEDs and two VU meters.
The three LEDs (C) indicates that the device is powered on.
To the left of 3 LEDs you see a retro analog VU meter (A). You can accurately monitor the output level
of left channel on dB scale.
To the right of 3 LEDs you see a retro analog VU meter (B). You can accurately monitor the output level
of right channel on dB scale.
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Rear Panel
LAB12 SUONO 25W Class A Single Ended Power Amplifier
SUONO
Rear panel
In rear panel you will find the connection inputs and outputs.
To the right side you will find an IEC AC input. Below IEC input (A) is located the main fuse holder (B)
and the Power switch (C).
A pair of RCA connectors (F) is about the middle of the back panel. It is the input of signal from your
preamplifier.
Bellow signal input you can find the speaker outputs. (D-E). You have the choice of 4 or 8 ohm output
for perfect matching with your speaker impedance.
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LAB12 SUONO 25W Class A Single Ended Power Amplifier
Main connections
Connect a High Grade Power cable to the IEC input and to your wall socket. Make sure that your
wall socket provides a good ground before connecting the power cable. You must supply 230 to
240 Volts AC (50Hz). (Every Suono is tuned and calibrated using the LAB12 Knack Power Cable)
Connect to your Preamplifier
Connect the preamplifier analog output to the analog line level input of your Suono Power
Amplifier. Make sure about the correct channel connections. We suggest to use a good quality
interconnect cable pair.
Connect your Speakers
Connect your speakers to the additional output of Suono (connect speakers from 2 to 4 ohm at
4ohm positive bind, speakers from 6 to 16 ohm at 8ohm bind). Make sure about the phase and
polarity of speakers, always connect ‘’plus’’ (red) bind of Suono to ‘’plus’’ (red) bind of speaker
and same with black.
Notes:
You can choose the operation of Suono between triode or Ultra Linear pentode mode, to tune the
sound closest to your taste.
This can be done thru two toggle switches on the back of power tubes. Position both switches
towards to transformers for triode mode or towards to tubes for Ultra Linear pentode mode.
Always do this selection with your amplifier turned off.
Suono is fully compatible with the best octal tubes (6550, KT88, KT120). You can use any of these
three types of tubes with no problem. Please always set correct bias after any tube change,
always use matched pairs of tubes (contact lab12).
Bias Setting
Bias board located inside of amplifier. You have to unscrew amplifier to reach this
board. You will also need a DC voltage meter to make adjustments. Please contact
a qualified person or your local dealer if you are not sure about this procedure.
After changing tubes always turn the two bias trimmers’ clockwise (cold bias) with
a 3mm screwdriver, before turning on the amplifier. Wrong bias will destroy your
tubes and possibly your amplifier. Always adjust tubes current immediately after
turning on. Repeat bias procedure at least 3 times the first 5 hours of using.
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LAB12 SUONO 25W Class A Single Ended Power Amplifier
For the safety of your equipment
! Make sure that all of your equipment is turned off before any connection.
! To avoid damaging your speakers you have to turn on SUONO
some seconds after turning on your preamplifier and turn it off
some seconds before turning off your preamplifier.
! Never turn on SUONO without connected speakers or preamplifier
on it. It is possible to damage tubes or even output transformers.
Specifications
• Power: 230/240V AC 50Hz
• Power consumption: 400 VA max
• Output power: 25 watt per channel (KT 150)
• Frequency response: 20Hz-20KHz (-0.8dB)
• Input impedance: 100K ohms
• Output impedance: 4, 8 ohm
• Tube complement: 2x 6n2p dual triode, 2x KT-150 Power Pentode
• Inputs: 1x line stereo (RCA connectors)
• Available colors: Matt Black, Pearl White, Custom color
• Dimensions (WxHxD): 43x19x29 cm
• Weight: 18Kg
Warranty
This device has 5 years warranty from the day of purchase for all parts exclude valve tubes.
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