Connections
Power
Mains supply connection is through a detachable power
cable with an IEC-type connector. The mains power switch
is mounted on the front panel of the amplifier.
Signal
All input signal connections are made to RCA sockets on
the back panel of the amplifier.
Speakers
The speaker output sockets accept banana jacks only. The
norm here is Red for signal and Black for ground. Maintain
the colour code when connecting to the loudspeaker, so
that the speakers operate in phase.
Installation
The amplifier
should be placed as close to the
loudspeakers as possible. This will allow the connections to
be made with short speaker cables. It is advisable to keep
the additional impedance seen by the amplifier as low as
possible. The best way to do this is to keep the speaker
cables short.
Good ventilation should also be provided around the
amplifier. The tubes generate a fair amount of heat, and
natural ventilation is necessary to dissipate this heat to the
surroundings. The amplifier chassis will get warm, but
should still be comfortable to touch.
Always place the amplifier on a firm, smooth surface.
Fuses
! Warning : In operation, this amplifier has high voltages.
Always switch off, and unplug the amplifier from the
mains supply before working on it. Wait for 5 minutes for
the high voltages to die down, before opening the
amplifier!
The amplifier is protected against overload by fuses at three
points. The mains supply fuse is mounted on the rear panel
and is easily accessed from the outside.
Inside the amplifier are two fuses on the high voltage supply.
These are mounted on the inside panel above the power
supply capacitors. To reach the internal fuses, remove the
back top plate of the amplifier.
Mains supply fuse 2 A, 250V (RQB 2000)
High Voltage supply fuse 200mA, 250V (RQB 200)
100mA, 250V (RQB 100)
On operation of the amplifier, if the fuses do blow, check all
possible causes before replacing the fuses. If any doubt
remains, contact Lyrita Audio for servicing.
