Conrad-johnson design Classic Sixty Manuale d'uso - Pagina 5
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I
nstallation
As is the case with any vacuum-tube power amplifier, the Classic
Sixty 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 installa-
tions, cooling fans are essential.
All Classic Sixty 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 Classic Sixty 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 volt-
age should be within + 5/- 10% of the nominal rated voltage.
Electromagnetic Interference (EMI)
Considerable care has been taken in the design of the Classic
Sixty 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 speci-
fied with a view to reducing the impact of electromagnetic fields on
the performance of this unit. At the same time, however, our pri-
mary goal is the accurate reproduction of recorded music in the
normal home environment, and we have elected not to compro-
mise 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 fol-
lowing 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
center conductors, and a separate external shield connected at
only one end).
Classic Sixty Owner's Manual
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