Vectronics VEC-1680K User Manual

Page 15

VEC-1680K Owner’s Manual

Vacuum Tube Preamp

! ! Refer to the pictorial diagram below, and position the 12.6 volt

transformer so the black leads are toward the PC board and the red are
toward the side of the chassis. Align the mounting tabs with the punched
chassis holes.

! ! Using 6-32 hardware, secure the transformer in place--inserting each

screw up through the chassis and securing it inside with a kep nut.
Tighten both screws.

! ! Cut about half the lead length from both the black transformer leads.

Dress both lead ends. Solder the back lead to TRANS1 and the front lead
to TRANS2.

Input

Output

Foot Switch

Power Jack

Power Switch

Red Transformer

Leads

Black Transformer

Leads

The preamp's power switch and power jack both mount from outside the chassis.
Since space is tight inside, you'll find it easier to wire these prior to installation.
This requires threading wires through the component mounting hole before
attaching. Begin by locating the power switch and positioning it as shown (note
the plastic partition between terminals #1 and #2). The switch tabs are raw
copper and should be cleaned with fine emery cloth or a pencil eraser prior to
attaching wires. Tab numbers are marked on the side of the switch.

! ! Thread the closest red transformer lead through the square switch

mounting hole in the chassis panel. Dress the lead end and connect it to
tab #1 without soldering.

! ! Cut a 4” length of hook-up wire and connect it to tab #1. Solder both

leads.