lab12 suono User manual

Owner’s Manual
suono
25W Class A Single Ended Power Amplifier
www.lab12.gr
manual v1.6

Lab12 suono- 25W Class A Single Ended Power Amplifier
Page 2of 9
Table of Contents
It is yours…………………………………………………
Unpacking and warnings………………………………
Features…………………………………………………..
Installation & Placement……………………………..
Suono Tubes Position………………………………….
Front Panel………………………………………………..
Rear Panel…………………………………………………
Main connections………………………………………..
Bias Setting……………………………………………….
For the safety of your equipment…………………...
Specifications…………………………………………….
3
3
4
4
5
6
7
8
8
9
9

Lab12 suono- 25W Class A Single Ended Power Amplifier
Page 3of 9
IT IS YOURS!
Thank you for selecting 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 Lab12 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 outcome. As every Lab12 device, suono has an ultra-solid
construction with glass blasting anodized finishing and retro analogue V/U meters.
Do not forget that your suono is totally handcrafted with perfectly matched parts of the finest
selections. In order to reach the optimal performance, your suono needs at least 150 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 thoroughly read this manual to properly
acquaint yourself with its features. We love music and audio devices and we have built 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
Unpacking
Suono should be removed from its box with care. Remove all the foam protective pieces of the box
before you unpack suono. Unpack suono with your hands on both sides of the device.
Warnings
No user serviceable parts are included inside. Do not unscrew the cover; high voltages remain after
disconnecting from mains. In case your device requires any kind of service or upgrade, please ship or
take your equipment directly to Lab12 or to one of our authorized dealers.
Always use same type of fuse for replacement.

Lab12 suono- 25W Class A Single Ended Power Amplifier
Page 4of 9
Features
•6550, KT88, KT120 compatible (KT150 from factory)
•Manual Bias Adjustment
•Triode / Ultra Linear selector switch
•No feedback design
•SRSG® implementation
•Fine symmetry® implementation
•Analog retro Nissei VU meters
•5mm Aluminum face panel
•Five Years Guarantee
Installation & Placement
Lab12 suono should be placed on a solid flat surface. You should avoid placing it near a heat source as
this could compromise suono’s performance and reliability.
Carefully put the tubes in dedicated sockets. Make sure that the tubes are perfectly snap into sockets.
See bellow page.
Due to high power tubes’design, suono’s chassis could be hot so you should never place another hot
component directly near this device. Make sure that 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 glass blasting anodized finish of front panel with a soft cloth. No need to use any sprays
or polishes. Never use cleaners containing abrasives, as this will damage the surface.

Lab12 suono- 25W Class A Single Ended Power Amplifier
Page 5of 9
Suono Tubes Positions
Insert the 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.
V1 : KT150
V2 : KT150
V3 : 6n2p
V4 : 6n2p

Lab12 suono- 25W Class A Single Ended Power Amplifier
Page 6of 9
Front Panel
SUONO Front pane l
In the front panel you will see three indication LEDs and two VU meters.
The three LEDs (C) indicate that the device is powered on.
To the left of the 3 LEDs, you will see a retro analog VU meter (A). You can accurately monitor the
output level of left channel on dB scale.
To the right of the 3 LEDs, you will see a retro analog VU meter (B). You can accurately monitor the
output level of right channel on dB scale.

Lab12 suono- 25W Class A Single Ended Power Amplifier
Page 7of 9
Rear Panel
SUONO Rear panel
In the 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), the main fuse holder (B)and the
Power switch (C) are located.
A pair of RCA connectors (F) is located about in the middle of the back panel. It is the input of the 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.

Lab12 suono- 25W Class A Single Ended Power Amplifier
Page 8of 9
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 Volt
AC/ 50Hz (115 to 120 AC Volts / 60Hz). (Every suono is tuned and calibrated using the Lab12 Knack
mk2 Power Cable. We strongly suggest using this 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 using 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 through 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 is located inside the amplifier. You have to unscrew the amplifier to reach
this board. You will also need a DC voltage meter to make adjustments. Please come
in contact with 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 bias current immediately after
turning on. Repeat bias procedure at least 3 times the first 5 hours of using.

Lab12 suono- 25W Class A Single Ended Power Amplifier
Page 9of 9
For the safety of your equipment
! Make sure that all 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: 230VAC 50Hz (115VAC 60Hz)
•Power consumption: 350 VA max
•Output power: 25 Watt per channel (KT 150)
•Frequency response: 20 Hz-25 KHz (-0.9dB)
•Input impedance: 100K ohm
•Recommended speakers: 4-8 ohm
•Tube complement: 2x 6n2p dual triodes, 2x KT-150 Power Pentodes
•Input sensitivity: 600mV triode mode / 500mV Ultra Linear mode
•Inputs: 1x line stereo (RCA connectors)
•Available Colours: Matt Black
•Dimensions (WxHxD): 43x19x29 cm
•Weight: 18Kg
Warranty
This device has 5 years warranty for all parts (or 90-Day Limited Warranty for vacuum tubes) from the
day of purchase.