Vectronics VEC-1680K Instrukcja Użytkownika Pobierz pdf (Strona 12)

VEC-1680K Owner’s Manual Vacuum Tube Preamp

! ! Align and install the DPDT relay at RLY1. Holding firmly in place,

solder all eight pins.

Now, install the preamp's 9-pin ceramic tube socket. As with the relay, these

mounting pins are keyed to ensure proper positioning. Make sure all pins are

firmly seated--and hold the socket in place when soldering.

! ! Align and install the ceramic tube socket at V1 and solder all 9 pins.

Next, install the twisted-pair filament leads to V1. Begin by locating the 4"

length of the orange-and-white twisted hook-up provided with your kit:

! ! Dress each wire at both ends, removing about ¼" of insulation.

! ! Install the white wire at one end at GNDA-1 and solder.

! ! Install the companion orange wire at A-1 and solder.

! ! Install the other end of the white wire at GNDA-2 and solder.

! ! Install the companion orange wire at A2 and solder.

! ! Cut and dress a 6" length of hook-up wire and install one end at FOOT

(this will be connected to the foot-switch jack later on). Solder.

Two shielded audio wires are used for the preamp's high-impedance INPUT and

OUTPUT leads. Shielding prevents these lines from picking up stray AC hum.

Note that only the circuit-board end of the lines are grounded. If both ends were

grounded, it could set up a "ground loop" inside the amplifier enclosure that

would introduce hum and noise. Prepare each cable as shown below:

1/2"

Trim off shield

! ! Prep a 4" length of shielded cable, as shown.

! ! Connect the shield to GND5 and solder.

! ! Connect the inner conductor to OUTPUT and solder.

! ! Prep a 8" length of shielded cable, as shown.

! ! Connect the shield to GND4 and solder.

! ! Connect the inner conductor to INPUT and solder.

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Vectronics VEC-1680K Instrukcja Użytkownika Strona 12