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VEC-1680K Owner’s Manual Vacuum Tube Preamp

INTRODUCTION

General Information: If names like Eric Clapton, Jimi Hendrix, and B.B. King

have personal meaning for you, you're gonna love this kit! Today's solid-state

amps can't match the booming sound of the legendary tube-driven powerhouses

built by Fender and Marshall. The key to that magic lies with the electron tube--

or "valve"--which has much softer saturation characteristics than the sharply

clipped response of transistor amplifiers.

With the VEC-1680K in line, your guitar's magnetic pick-ups are terminated

with the true ultra-high impedance load they were designed to feed, which

unleashes your instrument's natural full-bodied frequency response. And, when

you crank up the gain, each note expands in richness with warm even-order

harmonics, unlike the more jolting odd-order harmonics generated by transistors.

Virtually every great tube guitar amp ever built used a 12AX7 in its preamplifier

stage. When you fire up your VEC-1680K, you'll understand why!

Circuitry: The VEC-1680K uses a 12AX7 twin-triode, which is really two

individual tubes packaged in one glass envelope. The first stage runs "wide

open", with no manual gain control or negative feedback circuitry to load it

down. A Gain (or drive) control then regulates how hard you push the preamp's

second stage. Drive it lightly, and you get bell-like clarity. Drive it harder, and

you'll introduce progressively more fullness and grit! Most of the preamp's

distortion and coloring occurs in the second stage. At the preamp's output, the

signal is attenuated back down to "guitar" level. The Output control provides

added variable attenuation to set the optimum drive level for your power amp. A

built-in relay connected to the audio jacks lets you bypass the preamp, or--with

the click of a foot switch bring it on-line.

TOOLS AND SUPPLIES

Construction Area: Kit construction requires a clean, smooth, and well-lighted

area where you can easily organize and handle small parts without losing them.

An inexpensive sheet of white poster board makes an excellent construction

surface, while providing protection for the underlying table or desk. Diffused

overhead lighting is a plus, and a supplemental high-intensity desk lamp is

especially helpful for close-up work. Safety is always important! Use a suitable

high-temperature stand for your soldering iron, and keep the work area free of

clutter.

Universal Kit-building Tools: No special tools are required to complete this kit

beyond common items normally used for bench construction. We recommend

the following:

! Soldering Iron (grounded-tip and temperature-controlled preferred)

1 2 3 4 5 6 ... 24 25

Podsumowanie treści

Strona 1 - TOOLS AND SUPPLIES

VEC-1680K Owner’s Manual Vacuum Tube Preamp 1 INTRODUCTION General Information: If names like Eric Clapton, Jimi Hendrix, and B.B. King have persona

Strona 2 - BEFORE YOU START BUILDING

VEC-1680K Owner’s Manual Vacuum Tube Preamp 10 +Plus Lead Locate the three (3) 100 uF electrolytic capacitors. Observing polarity: ! ! Install a 10

Strona 3

VEC-1680K Owner’s Manual Vacuum Tube Preamp 11 holes (see below). Also, using side cutters, remove the key tab from the side of each pot prior to in

Strona 4 - PARTS LIST

VEC-1680K Owner’s Manual Vacuum Tube Preamp 12 ! ! Align and install the DPDT relay at RLY1. Holding firmly in place, solder all eight pins. Now, i

Strona 5

VEC-1680K Owner’s Manual Vacuum Tube Preamp 13 V1A-1GNDA-1GNDA-2A-2InputOutputGND4 GND5To J1To J4To J2FilamentLineRLY1FootInputOutputFootswitch Th

Strona 6

VEC-1680K Owner’s Manual Vacuum Tube Preamp 14 ! ! Install a spacer in the left-hand mounting hole (do not tighten). ! ! Repeat, installing one in

Strona 7

VEC-1680K Owner’s Manual Vacuum Tube Preamp 15 ! ! Refer to the pictorial diagram below, and position the 12.6 volt transformer so the black leads ar

Strona 8

VEC-1680K Owner’s Manual Vacuum Tube Preamp 16 ! ! Cut a 6” length of hook-up wire and attach it to tab #2. Solder. ! ! Thread the 6” and 4” leads

Strona 9 - Incorrect

VEC-1680K Owner’s Manual Vacuum Tube Preamp 17 Before installing the control knobs, set turn potentiometer shafts fully counterclockwise. ! ! Find a

Strona 10

VEC-1680K Owner’s Manual Vacuum Tube Preamp 18 1945Filament Pins If the filament is okay, check the power adapter for 12 VAC output (this may be sign

Strona 11

VEC-1680K Owner’s Manual Vacuum Tube Preamp 19 6. Connect an instrument to the Input jack of the preamp. 7. Connect a patch cord between the Output

Strona 12 - Trim off shield

VEC-1680K Owner’s Manual Vacuum Tube Preamp 2 ! High-temperature Iron Holder with Cleaning Sponge ! Solder, 60/40 or 37/63 with rosin or "no-c

Strona 13

VEC-1680K Owner’s Manual Vacuum Tube Preamp 20 OPERATING INSTRUCTIONS Set-up of the VEC-1680K is pretty intuitive. Like most in-line instrument acce

Strona 14

VEC-1680K Owner’s Manual Vacuum Tube Preamp 21 Does not turn on: Is the power adapter plugged in? Does it have 12 VAC output? Is the tube firmly s

Strona 15

VEC-1680K Owner’s Manual Vacuum Tube Preamp 22 coupled into gain control R9, which establishes the drive level for the following stage. The second s

Strona 16

Strona 17 - TESTING AND ALIGNMENT

VEC-1680K Owner’s Manual Vacuum Tube Preamp 24 ENCLOSURE Vectronics has designed a matching enclosure just for your VEC-1680K Vacuum Tube Audio Pream

Strona 18 - Important Warning:

Strona 19

VEC-1680K Owner’s Manual Vacuum Tube Preamp 3 the opposite side of the lead from your iron tip--solder will wick around the lead toward the tip, wett

Strona 20 - IN CASE OF DIFFICULTY

VEC-1680K Owner’s Manual Vacuum Tube Preamp 4 groups by multiplier band (make a pile of 10s, 100s, Ks, 10Ks, etc.). Next, sort each group by specifi

Strona 21 - THEORY OF OPERATION

VEC-1680K Owner’s Manual Vacuum Tube Preamp 5 instructions. If you can't positively identify an unfamiliar item on the basis of the information

Strona 22

Strona 23

Strona 24 - ENCLOSURE

VEC-1680K Owner’s Manual Vacuum Tube Preamp 8 GoodNot Good The term solder means to solder the part's leads in place, and to

Strona 25

VEC-1680K Owner’s Manual Vacuum Tube Preamp 9 ! ! Install a 390K at R3 and solder. ! ! Install a 390K at R4 and solder. Locate two (2) 1 Megohm ¼ w

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