Lab12 suono- 25W Class A Single Ended Power Amplifier
Page
8
of
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.
