Conrad-johnson design ET2 Vacuum Owner's Manual - Page 5
Browse online or download pdf Owner's Manual for Amplifier Conrad-johnson design ET2 Vacuum. Conrad-johnson design ET2 Vacuum 13 pages. Tube preamplifier
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I
nstallation
The ET2 dissipates approximately 20 watts of heat, and must be
adequately ventilated. Mount the unit horizontally on a flat, hard
surface, and take care that the ventilation holes in the bottom are
unobstructed. Allow at least two inches of clearance above the unit
and keep the cabinet or shelf open at the back. Vertical installation
is not recommended.
All ET2s 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 ET2 will have the correct operating voltage and fre-
quency clearly marked on the back panel of the unit, near the ac
power cord. In all cases, the actual line voltage should be within +
5/- 10% of the nominal rated voltage.
Electromagnetic Interference (EMI)
Considerable care has been taken in the design of the ET2 to
minimize its susceptibility to radio frequency interference and other
forms of EMI. Choice of materials, physical layout, grounding prac-
tice, and power supply design have all been specified with a view
to reducing the impact of electromagnetic fields on the perform-
ance 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 objec-
tive 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 prob-
lems which could be treated locally as needed, rather than com-
promising the performance of our product in the 99.9% of installa-
tions 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).
ET2 Owner's Manual
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