6
Installation
Power Supply
Be very careful to check that the rear chassis power selection switch is set
to the correct local line voltage position before using the unit (230 V posi-
tion: 220-240 V/50 Hz, 115 V position: 110-120 V/60 Hz)!
When in doubt about a source, contact your dealer or a professional electri-
cian.
Before connecting any equipment make sure that any machine to be
connected is turned off. Follow all safety instructions from page 5.
Place the unit on a level and stable surface. The unit’s enclosure is EMC-safe
and effectively shielded against HF interference. Nonetheless, you should
carefully consider where you place the unit to avoid electrical disturbances.
The unit should be positioned so that you can easily reach it, but there are
other considerations. Try not to place it near heat sources or in direct sunlight,
and avoid exposure to vibrations, dust, heat, cold or moisture. It should also
be kept away from transformers, motors, power amplifiers and digital proces-
sors. Always ensure sufficient air circulation by keeping a distance of 4-5 cm/2
inches to other units and to the sides of the unit.
Built around a toroidal transformer, the power supply has a minimal electro-
magnetic field to avoid hum or mechanical noise.
The power supply‘s output side is filtered by an RC circuit again to extract
noise and hum from the supplied electrical power.
6000 μf capacitors smooth out the positive and negative half waves. An
additional power supply filter is placed before the power switch to eliminate
disturbing interferences.
All signal processing components are supplied with two separate current
regulators to exclude influences from the remaining components.
The 220 v current for the tube stage power is smoothed out with 200 μF and
stabilized precisely by current regulators. The anode current is switched on
after warm up. Both measures ensure a remarkable extension of the tube‘s
lifetime.
The unit‘s supply voltage can be set to 230 V/50 Hz or 115 V/60 Hz. Check
your local power requirements for the appropriate setting. An AC power cord
is included to feed the IEC-spec, 3-prong connector. Transformer, AC cord
and IEC-receptacle are VDE, UL and CSA approved. The main fuse is rated at
315 mA for 230 v and 630 mA for 115 v. Chassis ground and AC ground can be
physically disconnected with the “GND Lift” switch on the rear panel to elimi-
nate hum.
