TIP:
PCB
Stuffing
Use
the
flat
end
of
the
10
‐
pole
terminal
block
as
a
lead
bending
tool.
This
works
for
most
of
the
parts.
Do
take
care
to
not
damage
the
meniscus
of
the
components.
Insert
all
resistors
before
soldering,
bending
the
leads
down
to
hold
them
in
place.
This
allows
one
to
fix
any
placing
errors
that
might
occur
very
easily.
Use
a
good
pair
of
snips
to
remove
the
excess
leads.
The
top
side
of
the
PCB
is
designated
as
the
side
with
the
ground
plane
and
with
the
sockets
marked
as
‘THIS
SIDE
ONLY’.
1.
Stuff
all
fixed
value
resistors
into
the
PCB.
Mount
R36
and
R34
on
the
opposite
side
of
the
PCB
(i.e.
opposite
of
R37
and
R35).
This
is
to
maximize
heat
dissipation.
2.
Stuff
variable
resistors.
You
may
choose
to
put
them
on
the
top
side
of
the
PCB
and
drill
extra
holes
in
your
chassis
for
external
adjustments.
There
are
guides
hole
in
the
PCB
for
this.
Also,
be
sure
you
will
can
easily
insert
a
DMM
probe
between
the
resistors.
3.
Kink
leads
on
the
silver
mica
capacitors
and
stuff.
4.
Stuff
D1
and
D2.
Mind
the
orientation
of
the
cathode,
which
is
represented
by
a
stripe
on
both
the
silkscreen
and
the
diode’s
body.
5.
Stuff
C5,C6,C7
&
C8.
Mind
the
polarity.
The
board
has
“+”
symbols
to
show
where
the
positive
terminal
from
the
capacitor
should
be
placed.
Note
that
many
modern
caps
have
only
the
“
‐
“
terminal
marked,
usually
with
a
stripe
running
down
one
side.
If
you
choose
to
substitute,
the
diameter
must
be
no
more
than
10mm.
Use
a
smaller
value,
for
example
100uF,
if
necessary.
6.
Stuff
all
the
polyprop
capacitors.
7.
Place
and
solder
all
the
tube
sockets
–
make
sure
they
are
mounted
on
the
top
side
only.
It
is
recommended
to
use
an
old
miniature
nine
pin
tube
to
break
in
the
sockets.
I
have
found
a
very
small
nail
works
well
for
me
–
but
don’t
break
the
ceramic!
8.
Place
and
solder
the
terminal
blocks.
Do
not
over
solder
the
connectors
as
solder
could
then
spill
under
the
connector
causing
a
short.
9.
Stuff
R42,
the
IRCL,
making
sure
it
doesn’t
lean
on
or
touch
the
J1
terminal
block
as
it
gets
warm.
10.
Stuff
the
4
filter
capacitors.
Mind
the
polarity.
If
these
are
substituted,
the
diameter
must
be
25mm
or
less.
The
height
must
be
30mm
or
less
to
fit
in
a
2”
high
chassis.
11.
Carefully
go
over
your
work,
looking
for:
a.
any
cold
solder
joints
(these
will
look
dull)
