Arcam Delta 90.2 - Manual (Page 9)

Cartridge loading modules
These optional accessories are passive, switchable modules
designed to modify the input impedance of the amplifier in order to
obtain the best match with the cartridge in use. As the Delta 90.2 has a
single set of disc inputs (switchable to MM or MC via the switch on the
rear panel), then two separate loading modules ~ one for moving magnet
(type ULM/M) and one for moving coil (type ULM/C) cartridges - are
available on request from your dealer, distributor or the factory. These
modules are user adjustable via a series of small switches.
The loading modules should be plugged into the amplifier on
the pins located close to the disc input (see section - Removal of top
plate below). A set of instructions is provided with each module. Care
should be taken to ensure that only an MM loading module is used in
conjunction with moving magnet or high output moving coil cartridges
and that only an MC loading module is used in conjunction with normal
(low output) moving coil cartridges.
Under no circumstances adjust the loading module switches
when the amp is switched on and the volume turned up as severe
damage may occur to your amplifier or speakers.
It must be emphasised that these passive modules mainly
affect the sound balance and frequency response. They will have little or
no effect on the sensitivity of the amplifier. Most cartridges will perform
satisfactorily without any loading module.
Mains Fuse
All versions of the Delta 90.2 are fitted with an anti-surge
mains fuse, rated at 1.25A for 220V and 240V models and 3.15A for
100-120V models. Just occasionally a mains fuse may fail, indicated by
the amplifier appearing to be completely 'dead'.
A new mains fuse should only be fitted if you have no other
reason to suspect that the amplifier may be at fault. (If the amplifier does
appear to be at fault consult your dealer immediately).
The mains fuse is located in a holder close to the mains inlet.
Always ensure that you fit a new fuse of the same type and value. You
should find a spare mains fuse in the spares kit provided or, alternatively,
fitted inside the amplifier close to the mains inlet.
If the new fuse fails we recommend that you return the
amplifier to your dealer for investigation and possible repair.
It is ESSENTIAL to note the precautions detailed below.
Removal of top plate
Should you need to fit a new mains fuse or install a cartridge
loading module, before removing the top plate ALWAYS SWITCH OFF
THE AMPLIFIER AND DISCONNECT IT FROM THE MAINS SUPPLY.
Note that the mains fuse remains live whenever the amplifier
is plugged into the mains, even when the amplifier power switch is in
the 'off' position.
Before replacing a mains fuse the loudspeakers should also be
disconnected. If after replacing the mains fuse and switching on the
amplifier it appears to be working properly (i.e. not overheating,
sounding OK on headphones etc.), then the loudspeakers may be
re-connected - but only after turning the unit off once more.
To remove the top plate unscrew the two black headed
screws at the top of the rear panel using a No. I 'Posidriv' screwdriver.
Then lift the top plate vertically and pull it backwards slightly to release
it. Replacement is simply the reversal of this procedure.
Connecting cables
When dealing with high quality hi-fi systems, such as those
based around a unit with the resolving power of the Delta 90.2, the
question of connecting cables becomes of paramount importance. We
strongly recommend that only first class loudspeaker and interconnect
cables be used with your hi-fi system. We have found interconnect and
loudspeaker cables from the AudioQuest 'LiveWire' range to be
particularly suitable. Detailed information on the Audioquest range of
cables may be obtained from your dealer or the factory.
As a rule of thumb you might budget to spend between 5% and 20%
of the price of your system on cable. Surprising though it may seem this
can be one of the most effective upgrades you can carry out on your
system.
We suggest that you discuss the question of interconnect and
loudspeaker cables with your dealer.