WDHD3S Kit Assembly Instructions
2
SKILL LEVEL
To build this unit you must be able to:
a) solder to a good standard
b) have some knowledge of valve circuitry
c) possess a rudimentary understanding of electricity and electronics
d) have a multimeter and be able to use it
e) know the precautions necessary to avoid electric shocks from the
AC mains and amplifier power lines
f) have access to a dummy load or an old pair of headphones
g) identify components, particularly resistors, using either the markings
or a multimeter.
A NOTE ON TINNING
For ease of use we make every effort to provide tinned copper wire with
this kit, however there are occasionally supply problems and we are
unable to do so. We recommend that you
“
tin
”
any bare copper wire before
making a joint.
A NOTE ON HEAT
-
SHRINK
If you have not used heat
-
shrink before, the only difficult thing is to
remember to slide an appropriate length of heat
-
shrink over the wires
BEFORE soldering the joint! Slide the sleeving completely over the bare
wires and carefully apply heat from a mini heat
-
gun (available cheaply
over the internet) or from a cigarette lighter, taking care not to damage
any PVC insulation nearby. We supply plenty of heat
-
shrink, so do
practice a couple of times before you set out.
BUILD SEQUENCE
Before you start building it is a good idea to check the parts supplied
against your parts list. Please be aware that
“
picking errors
”
do happen
even if very infrequently
-
make sure that you check the value and rating
of each component carefully. A schematic of resistor colour coding is
given at the end of this booklet. Use the check column on the parts list
to cross off your components. To help you through the build process you
will find throughout the manual diagrams and photographs labelled
Fig. 1
,
Fig. 2
and so on. These will bear correlation to the text and to the
highlighted figure in the margins.
WDHD3S Kit Assembly Instructions
2
SKILL LEVEL
To build this unit you must be able to:
a) solder to a good standard
b) have some knowledge of valve circuitry
c) possess a rudimentary understanding of electricity and electronics
d) have a multimeter and be able to use it
e) know the precautions necessary to avoid electric shocks from the
AC mains and amplifier power lines
f) have access to a dummy load or an old pair of headphones
g) identify components, particularly resistors, using either the markings
or a multimeter.
A NOTE ON TINNING
For ease of use we make every effort to provide tinned copper wire with
this kit, however there are occasionally supply problems and we are
unable to do so. We recommend that you
“
tin
”
any bare copper wire before
making a joint.
A NOTE ON HEAT
-
SHRINK
If you have not used heat
-
shrink before, the only difficult thing is to
remember to slide an appropriate length of heat
-
shrink over the wires
BEFORE soldering the joint! Slide the sleeving completely over the bare
wires and carefully apply heat from a mini heat
-
gun (available cheaply
over the internet) or from a cigarette lighter, taking care not to damage
any PVC insulation nearby. We supply plenty of heat
-
shrink, so do
practice a couple of times before you set out.
BUILD SEQUENCE
Before you start building it is a good idea to check the parts supplied
against your parts list. Please be aware that
“
picking errors
”
do happen
even if very infrequently
-
make sure that you check the value and rating
of each component carefully. A schematic of resistor colour coding is
given at the end of this booklet. Use the check column on the parts list
to cross off your components. To help you through the build process you
will find throughout the manual diagrams and photographs labelled
Fig. 1
,
Fig. 2
and so on. These will bear correlation to the text and to the
highlighted figure in the margins.
