Conrad-Johnson LP260m mono-
block power amplifier Owner’s Manual
4
Installation
As is the case with any vacuum-tube power amplifier, the LP260m
mono-block power amplifier dissipates a significant amount of heat.
Provision must be made for adequate ventilation. Mount the unit on
a flat, hard surface, taking care that the ventilation holes in the
bottom are unobstructed. Maintain at least four inches of clearance
above the unit, and at least three inches on the sides. The cabinet
or shelf should be open at both front and back. For more restricted
installations, cooling fans are essential.
All LP260m mono-block power amplifiers sold in the United States
are configured for operation on a 60Hz ac power line producing
between 108 and 126 volts. Export versions of the LP260m mono-
block power amplifier will have the correct operating voltage and
frequency clearly marked on the back panel of the unit, near the ac
power cord. In all cases, the actual line voltage should be
5/- 10% of the nominal rated voltage.
Electromagnetic Interference (EMI)
Considerable care has been taken in the design of the LP260m
mono-block power amplifier to minimize its susceptibility to radio
frequency interference and other forms of EMI. Choice of
materials, physical layout, grounding practice, and power supply
design have all been specified with a view to reducing the impact
of electromagnetic fields on the performance of this unit. At the
same time, however, our primary goal is the accurate reproduction
of recorded music in the normal home environment, and we have
elected not to compromise this objective by the application of
heavy-handed RFI filters, or by using grounding practices that
reduce RFI at the expense of degraded audio performance. We
find that the approach we have taken has worked extremely well,
resulting in only rare instances of EMI problems which could be
treated locally as needed, rather than compromising the
performance of our product in the 99.9% of installations where EMI
is not a problem.
Care in installation can often avoid EMI induced problems. The
following practices should generally be observed in any
application, and will be especially important where EMI may be a
problem.
Interconnect cables should be kept as short as possible (3 meters
or less), and shielded cable should be used (cable which has two
