Vectronics VEC-1680K - Manual (Page 8)

VEC-1680K Owner’s Manual Vacuum Tube Preamp
8
Good Not Good
The term solder means to solder the part's leads in place, and to inspect both (or
all) solder connections for flaws or solder bridges. Nip off excess protruding
leads with a sharp pair of side cutters.
Begin construction by locating the 2-sided PC board. Find the side of the board
with long horizontal tracks on it. This will be called the solder-side during
construction. Flip it over to the side with no tracks. This will be called the
component side. Unless otherwise indicated, parts will be mounted on the
component side (exceptions are three large electrolytic capacitors and two gain
controls to be mounted on the other side).
Orient the PC board component-side up.
This kit has 11 fixed-value resistors. Mount these now, starting with the smallest
value and moving to the largest. Before mounting each one, carefully bend both
leads close to the resistor body to form right-angles, as shown below:
Locate two (2) 100 ohm 2 watt resistors (brown-black-brown).
! ! Install a 100 ohm at R12 and solder.
! ! Install a 100 ohm at R13 and solder.
Locate two (2) 3.3K ½ watt resistors (orange-orange-red).
! ! Install a 3.3K at R1 and solder.
! ! Install a 3.3K at R11 and solder.
Locate two (2) 10K ¼ watt resistors (brown-black-orange).
! ! Install a 10K at R5 and solder.
! ! Install a 10K at R7 and solder.
! ! Find a 22K ¼ watt resistor (red-red-orange). Install at R8 and solder.
Locate two (2) 390K ¼ watt resistors (orange-white-yellow).