D.W. Fearn VT-1 Instruções de Operação descarregar pdf (Página 23)

D.W. FEARN

VT-1 &

VT-2 Microphone Preamplifers

OPER

TION

Input

Since t

he input cable will be carrying very low level audio, it is important that a well-shield-

ed cable is used. Ther

e should be no additional connectors, patch jacks, switches, etc.

between the microphone and the VT-2 input. This can be achieved with a dedicated line from

an XLR connector in t

he studio to each VT-2 in the control room. Although long input cable

runs have little effect on the performance of the VT-2, it is preferable to keep the input line

Figure 2. VT-2 front panel controls and indicators

as short as possible. One successful method is to place the VT-2 in the studio with only a

short cable to the microphone. Line level from the VT-2 output is then fed back to the con-

ol r

oom. Avoid locating the VT-2 where it will be subjected to high sound levels or excessive

vibration (such as on a drum riser).

Output

The output of the VT-2 is line level, transformer balanced. Note that vacuum tube equipment

is mor

e sensitive to load impedance than solid state units. The VT-2 design was optimized for

feeding a balanced bridging input (20k ohms or greater). When feeding a 600 ohm load,

there may be a slight degradation of some of the specifications. In modern studio equip-

ment, bridging line inputs are universal. If the device being fed by the

-2 has an input

termination switch, that switch should be in the “off” position.

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D.W. Fearn VT-1 Instruções de Operação Página 23