Conrad-Johnson ET3 Instrukcja obsługi - Strona 5

Przeglądaj online lub pobierz pdf Instrukcja obsługi dla Przedwzmacniacz Conrad-Johnson ET3. Conrad-Johnson ET3 13 stron. Vacuum-tube preamplifier

Installation

The ET3 Preamplifier dissipates up to nearly 30 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 ET3s 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 ET3 Preamplifier 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 within + 5/- 10% of the nominal rated voltage.

Considerable care has been taken in the design of the ET3

Preamplifier to minimize its susceptibility to radio frequency inter-

ference and other forms of EMI. Choice of materials, physical lay-

out, 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 applica-

tion, 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).

Conrad-Johnson ET3 Preamplifier Owner's Manual