INTRODUCTION
The Hafler SE-240 is a two channel audio amplifier which
has been engineered to meet high performance and
reliability standards while maintaining affordability.
The amplifier employs a sonically proven circuit topology
driving MOSFET output devices. These devices provide
exceptional reliability as a result of their inherent rugged-
ness and resistance to abusive operating conditions. Con-
sequently, the SE-240 is capable of delivering high current
into low impedance loads, and generally the amplifier will
not be damaged in the case of an accidental short circuit
at the output. The drive circuitry is a high performance
arrangement with a double differential JFET input. Quality
components are used in the design to ensure longevity
and, above all, sonic excellence.
INSTALLATION
Ventilation
Adequate air flow is important to the continuing reliability
of any amplifier. Cool air must be able to circulate freely
through the perforations in the cover and under the chas-
sis, and around the heat sinks. It is expected that the
amplifier will always be resting on its feet, which should be
on a hard enough surface that air flow underneath will not
be obstructed. If the amplifier is mounted in a rack, or
through a panel, the feet may be removed so long as
adequate ventilation is provided through the bottom open-
ings. It is normal for the cover and heat sinks to become
warm in use.
Location
If the amplifier is to be installed close to a record player,
you should first check its position for freedom from hum
pickup by the phono cartridge, as any large power trans-
former radiates a field which may induce hum. Although
3
