It is essensial that the K-70 is powered off com-
pletely before wiring or re-wiring.
Speakers
The precautions are really very simple.
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If your speaker cables are of a stiff nature, it may
be a good idea to provide some strain relief to
allow the cable ends to be correctly fastened into
the K-70 speaker terminals such that the chances
of a speaker wire jumping out and touching the
K-70's chassis are minimised.
Source component connection.
The K-70 has four input modes; Single ended and
Balanced voltage driven, plus Single ended
and Balanced in the current mode.
Current mode pre-amplifiers are presently
rare so most installations would use the prac-
tically universal voltage mode.
You can choose between using the single
ended or balanced inputs with confidence. The
best performer will be dictated only by your
source components characteristics.
Connect either to the balanced or single ended
input socket But not both at the same time! Set
the Bal/SE switch into the appropriate position
and set the Low- Z / Hi-Z switch into the Hi-Z
position. These are locking switches to prevent
accidental adjustment. Simply lift the lever of
the switch toward you and then toggle it to the
selection required.
Note – Don’t adjust the switches or make
connections while the amplifier is on!
Recommendation – If you live in an area where
the atmosphere is corrosive, it may be wise to
shelter un-used input sockets from the environ-
ment by plugging in a “dummy” connector or
other socket protection caps.
For reference: The balanced input is wired as
follows: Pin 1 is Ground, Pin 2 is Hot and Pin
3 is Cold.
Using Current Mode inputs
For the current mode inputs to work correctly the
K-70’s input interphase, mounted on an octal
socket between the two vacuum tubes needs to
be swapped out for a different one. This unit is
available as a separate accessory.
DC Power connector
The DC power connector connects each mono
unit to the power supply.
We have used connectors here of military applica-
tion origin (that should explain their color!) since
the connectors carry some 11 amps of continu-
ous current and a high 350 volts.
Align the key of the connector with the key of the
socket, push until the connector and socket meet
and then rotate the connector’s outer ring until
the connector fully locks into the socket. There is
quite a bit of thread so it takes a little effort!
We have used a right angle connector on the
amplifier side and a straight connector on the
power supply side. If you find that the right
angle connector is protruding in an inconvenient
direction, it is possible to adjust this – Please
see the technical section T3 for details.
Takumi K-70 Owner's guide
6. Connecting and set-up
6
(Mono Blocks)
Never allow one of the speaker wires to touch the
chassis work of the K-70 or any other conductive
object other than the K-70’s speaker terminal.
Only connect passive loudspeakers to the speaker
terminals. This means that any devise or lo-
udspeaker that has its own AC power chord, such as
active subwoofers and loudspeakers with internal
active subwoofers, may NOT be directly connect
ed to the K-70. If you have an enquiry in this rega-
rd, we will be happy to assist before you make
the connections! Electrostatic loudspeakers
also fall into the category of not connectable
but under certain circumstances, depending on
make and model, may be safely connected.
Important notice: The K-70 has DC floating
outputs. This means you need to take some
special precautions otherwise you may destroy
the loudspeakers you have connected.
Note – The power supply will not switch on
unless all DC power connections are made for
both amplifiers. We have done this to contrib-
ute to safety.
