Dynakit MArk IV User manual
INSTRUCTIONS
FOR
ASSEMBLING
DVNAKIT
MARK
IV
SERIAL
NUMBER
8[
0'.'-
f'")
~
'~.J.'
...
/,
Jt,
.•
This
numbermust
be
men-
tioned
in
all communica-
tions concerning Dynakit.
PATENTED
3060
JEFFERSON
STREET
PHILADELPHIA,
PA.
19121
Price
$1.00
1)2658
SPECIFICATIONS
Power output: 40
watts
continuous, 90
watts
peak
1M
distortion: less
than
1%
at
40 watts, less
than
.05%
at
1
watt
Frequency response: ±
.5
db
from 10 cps to 40 kc;
±
.5
db
from 20 cps to 20
kc
at
40 watts
output
Power response: 20
cps
to
20 kc
without
exceeding
1%
distortion
within
1
db
of 40
watts
Sensitivity: 1.3 volts rms
input
for 40
watts
output
Hum
and
Noise: Inaudible; 90
db
below 40
watts
(choke filtering)
Damping
Fador:
15
i
Output Impedances: 4, 8
and
16 ohms
Tubes: EL-34
(2),
7199, GZ-34, selenium rectifier
Finish:
bright
nickel chassis, vinyl coated charcoal
brown cover
Special Features:
Matched
tubes,
Dyna
Biaset for
non-critical
adjustment,
preamp
power socket, fuse
post, on-off switch
Power Consumption: 115
watts
Size: 5" x14" x
6%"
high
Weight: 20
pounds
INSTRUCTIONS FOR ASSEMBLING DYNAKIT
MARK
IV
DESCRIPTION
The
Mark
IV
Amplifier uses a
circuit
arrangement
based
on
that
of
the
Dynakits
Mark
II
and
Mark
III
which
have
become world famous for
superior
quality
while essentially
simple
and
trouble
free.
The
new
7199
tube
is used
as
a
pentode
high
gain
voltage am-
plifier
directly
coupled
to
a
cathodyne
phase
inverter.
All
parameters
are
adjusted
for
minimum
distortion.
This
type
of
phase
inverter
has
the
unique
advantage
that
its
operation
is
independent
of
tube
aging so
that
no
adjustments
are
required
in
maintaining
optimum
performance.
An
internal
capacitive
feedback loop balances
the
phase
inverter
at
the
highest
frequencies,
and
the
arrangement
provides
accurately
balanced driving
signals to
the
output
tubes, which
are
EL-34's oper-
ated
well below
their
maximum
ratings.
The
output
tubes use afixed. bias
arrangement
which is
set
through use
of
Dyna
Biaset
(patent
pending)
which
provides
optimum
linearity
of
the
tubes
and
mini-
mizes
the
effects of
unbalanced
components.
The
connection of
the
output
tubes includes asmall per-
centage
of screen loading which improves
the
regu-
lation
of
the
output
stage
and
makes
it
comparatively
uncritical of load impedance.
The
impedance
match
and
bias conditions utilized
in
the
output
stage
provide
minimum
distortion
over
avery wide
dynamic
range.
In
addition,
20
DB
of
negative voltage feedback lowers
the
distortion
to
an
unmeasurable
proportion
at
normal listening levels
and
to
less
than
1%
intermodulation
distortion
at
40
watts
output.
The
use of a
minimum
number
of
phase
shifting
stages
along
with
careful
transformer
design makes
it
possible to
have
unconditional
stability
at
both
high
and
low frequencies.
This
feature of
the
design
means
that
there
is no
tendency
toward
motorboating
or
oscillation
under
any
condition
of use.
The
inherent
linearity
of
the
circuit, its
absolute
stability,
and
the
prefabrication
of all critical wiring
on
the
printed
circuit
assembly
make
construction
completely non-critical.
The
use of conservatively
operated,
highest
quality
components insures supe-
rior
and
dependable
operation
over along period of
time.
GENERAL
WIRING
PRACTICE
Assembly of
the
Dynakit
Mark
IV
is
quite
simple
compared
to
general
kit
assembly requirements.
This
is because all
critical
parts
of
the
Dynakit
are
factory
assembled for
you
on
the
printed
circuit
assembly.
Other
parts
are
out
in
the
open
in afree
and
unclut-
tered
layout
so
there
is easy accessibility for wiring
or
trouble shooting purposes. Con<;truction of
your
Dynakit
should
not
take
more
than
three hours be-
cause
of
these
simplifications.
Upon
opening
your
kit, check
the
components
with
the
parts
list.
Familiarize
yourself with
the
compo-
nents;
they
can
be identified by
comparison
with
the
pictorial
diagram
and
by
specified color coding.
Tools required for easy assembly
of
your
Dynaldt
are
asoldering
iron
(small
tip)
or
soldering gun,
long nose pliers, screwdriver,
and
wire
cutters. Al-
though
not
essential, alow
cost
wire
stripper
and
cutter
of
the
type
which
can
be
purchased
for less
than
a
dollar
win
greatly
facilitate
cutting
and
strip-
ping
the
various leads
in
the
kit.
c,;ood
soldering technique is
valuable
in
obtaining
satIsfactory results from
any
electronic equipment.
ALL
SOLDERING
MUST
BE
DONE
WITH
ROSIN
CORE
SOLDER.
There
is
no
warranty
on
any
equipment
in
which
acid
core solder has been
used.
Make
sure
that
the
solder
is
plainly
marked
"Rosin
Core."
If
you
have
solder
on
hand
the
origin
of which is doubtful,
it
is wise
to
obtain
new
50/50
or
60/40
rosin core solder.
Whenever
soldering is
required,
the
assembly
instructions
specify
it
by
"(S)
".
If
this symbol is
not
shown
after
aconnection
is specified,
it
indicates
that
further
connections will
be
made
at
that
point
before soldering.
Soldering is accomplished
by
heating
the
joint
with
the
iron
until solder is
hot
enough to
flow
when
touched to
the
joint.
It
is
not
desirable
to
feed
the
solder
to
the
iron.
It
should
be fed
to
the
junction
of
iron
and
joint. After
the
solder
flows,
the
iron
should
be held in place for afew seconds
and
removed when
it
is seen
that
the
solder
has
contacted
both
parts
of
the
connection-the
lug
and
the
wire connected
to
it.
It
should
not
show aball
of
solder,
hut
asmooth
transition
from solder to
component
lead.
Before
applying
solder
the
joint
should
be
c1e.an
and
the lead
should
be
crimped in
place
so
as
to have
mechanical security.
It
is
not
necessary to
wrap
leads
around
contacts
many
times. Asingle
turn
and
pinch-
ing together
with
pliers is suitable. After soldering
there should be no
play
at
the
joint
if the )Pad is
wiggled
with
a
pair
of pliers.
It
is practical to
do
all
soldering
with
apencil
type
iron
wi~h
alow
wattage
:ating.
Asmall
tip
is
extremely useful when working
III
confined space.
If
asoldering gun
is
used
it
should
be used with discretion since
the
amount
of
heat
available
is
far more
than
required
fOl'
soldering
light
wires.
Component
leads
should
be trimmed as
they
are
used;
the
length should be
such
that
the
proper
con-
nection
can
be
made
from
point
to
point
without
strain
on lugs or components.
Care
should
be exer·
cised
not
to allow wires to touch
one
another
unless
they
are
actually
connectf::.j to the
same
point.
The
instructions which follow have been
arranged
for simplified procedure in which
the
work can be
done
without
interference between
the
various por-
tions of
the
wiring.
It
is recommended
that
the in-
structions
be followed
on
a
step
by
step
basis, check-
ing off each
step
as
it
is completed.
The
pictorial
diagrams
should be used for reference
and
all con-
nections Checked
against
these before going on to
tlw
next step.
If
the wiring is done methodically
and
each
step
checked carefully,
your
amplifier
should
work
without
difficulty
as
soon
as
it
is completed.
Refer
WIRING
INSTRUCTIONS
/
Connect
one
of
the
black
power transfor-
mer
leads
to
lug
#2
of
the
slide
switch
(8).
Connect
the
other
black
lead
to
lug
Bof
the
fuse
post
(8).
Connect
one
yellow power
transformer
lead
to
pin
#2
of
socket
V1
(8).
Con-
nect
the
other
yellow
lead
to
pin
#8
of
socket
VI.
the
hole
near
the
four screw
terminal
strip.
Use
#8
hardware
to
secure
the
transformer.
Mount
the
quadruple
section
filter ca-
pacitor
in
the
special
cutout.
Observe
the
symbols
at
the
base
of
each
connecting
lug.
These
should
be
oriented
as
shown
in
the
pictorial.
Fasten
the
capacitor
by
giving
each
of
the
mounting
lugs
a
quar-
ter
turn
while
holding
the
capacitor
snugly
against
the
chassis.
Twist
the
two red
leads
together
and
position
them
around
socket
VI.
Con-
nect
one
red lead
to
pin
#4
(8).
Con-
nect
the
other
red
lead
to
pin
#6
of
VI
(8).
Twist
the
two green power
transformer
leads
together
and
position
them
to
socket
V2.
8EE
PICTORIAL.
Connect
one
green
lead
to
pin
#2
of
socket
V2,
and
the
other
green
lead to
pin
#7
of
V2.
Connect
the
green/yellow
lead
to lug
#2
of
the
five lug
terminal
strip.
Connect
the
red/yellow
lead
to
solder
lug
at
the
mounting
screw of
the
five
lug
strip,
Connect
the
red/black
lead
to lug
#4
of
the
five lug
strip.
Connect
one
choke
lead
to
Jug #1 (semi-
circle)
of
the
quad
filter
capacitor.
Con-
nect
the
other
choke
lead
to
lug
#2
of
the
filter
capacitor.
Connect
the
black
lead
of
the
A-470
output
transformer
to lug #Iof
the
four
screw
terminal
strip.
Connect
the
brown
lead to lug
#2
(8).
Connect
the
orange
lead
to lug
#3
(8).
Connect
the
yellow
lead to lug #4.
Connect
the
red
output
transformer
lead
to lug
#2
of
the
filter
capacitor.
Twist
the
remaining
leads
together
and
carry
them
to
sockets
V2
and
V3.
8EE
PIC-
TORIAL.
Connect
the
blue/white
lead
to pin#3 of
socket
V2
(8).
Connect
the
green/white
lead
to
lug
#4 of
socket
V2
-
(~
)
(-J;
4
2
7
5
9
6
3
8
10
Each
length
of
hookup
wire
specified
should
have
approximately
%" of
insulation
'stripped
from
each
end
unless
otherwise
specified.
Transformer
leads
may
be
trimmed
as
required
for a
neat
wiring
job.
1
(j)
12
MECHANICAL
ASSEMBLY
Pictorial
Diagrams
for
Location
of
Parts
Mount
the
four
octal
sockets
with
#4
screws,
nuts,
and
lockwashers
(the
small-
est
screws
supplied).
Note
that
there
is
a
small
slot
or
keyway
in
the
center
hole
of
each
socket;
be
sure
in
each
instance
that
this
keyway
is
properly
oriented
as
shown
in
the
pictorial
diagrams.
Insert
the
screws from
the
top
of
the
chassis
and
mount
the
sockets
from
the
inside.
Fasten
each
screw
with
a
nut
and
lockwasher.
Mount
the
input
socket
from
the
inside
of
the
chassis
using
#4
screws,
nuts,
and
lockwashers.
Using
#4
hardware,
mount
the
four screw
terminal
strip
on
the
outside of
the
chassis.
Mount
the
slide
switch
from
the
inside
with
#4 screws.
Nuts
and
lockwashers
are
not
necessary
in
this
instance.
Follow
the
position
of
the
connecting
lugs in
the
pictorial.
Mount
the
fuse
post
with
the
special
nut
provided.
The
rubber
bushing
goes
on
the
outside
of
the
chassis.
Note
that
there
is
only
one
correct
way
for
the
post
to
be
mounted.
Insert
the
rubber
grommet
in
the
%"
hole
at
the
end
of
the
chassis.
Mount
the
10,000
ohm
bias
potentiometer
in
the
%" hole
near
the
pair
of
octal
sockets.
Put
the
lockwasher
on
the
shaft,
insert
the
control
in
the
hole
and
fasten
at
the
top
of chassis
with
the
%"
nut.
Note
orientation
of
connecting
lugs.
Mount
the
five lug
terminal
strip
and
the
solder
lug
at
the
center
of
the
chassis.
Insert
a#4 screw from
the
outside.
Place
the
terminal
strip
over
the
screw,
then
the
small
solder
lug,
then
the
#4
nut.
With
#4
hardware,
mount
the
cable
clamp
loosely
near
the
single
octal
socket.
Feed
all
the
wires
of
the
power
trans-
former, PA-135,
through
the
single
hole
provided.
Fasten
the
transformer
in
place
with
two
#8
screws in
the
holes
nearest
the
front
of
the
chassis
using
#8
lockwashers
and
nut<>.
Now,
from
the
bottom,
place
the
choke
over
the
remain-
ing
two
transformer
mounting
holes
and
fastcn
both
in
place
with
two
more
sets
of
#8
hardware.
All
but
the
black trans-
former
leads
go
under
the
cable
clamp
next
to
the
rectifier socket;
and
then
this
clamp
may
be
tightened.
Mount
the
output
transformer,
A-470,
on
the
remaining
set
of
holc-t;
at
the
center
of
the
chassis.
Note
that
the
black, brown
orange,
and
yellow leads
come
through
(J )
( )
9
7
6
2
4
5
8
1
3
11
10
2
11
12
13
14
15
16
17
18
19
20
21
22
23
(S).
Connect
the
blue
lead to
pin
#3
of
V3
(S).
Connect
the
green
lead
to
pin
#4
of V3.
Connect
one
end
of a10,000
ohm
(brown-black-orange) resistor to lug
#5
of
the
five
lug
strip.
Connect
the
other
end
to lug #1 of
the
10,000
ohm
bias po-
tentiometer
(S).
Connect
the positive
(+)
end
of
the
selenium
rectifier
to
lug
#4
of
the
five
lug
strip
(S).
Connect
the
negative
(-)
end
to
lug
#5 of
the
strip.
Connect
the
negative
(-)
end
of a50
mfd
bias
capacitor
to lug
#5
of
the
five
lug
strip
(S).
Connect
the
positive
(+)
end
to
lug
#3
of
the
strip.
Connect
the
positive
(+)
end
of
the
other
50
mfd
bias
capacitor
to
lug
#3
of
the
five
lug
strip.
Connect
the
other
end
to
lug
#2
of
the
10,000
ohm
bias poten-
tiometer.
Connect
one
end
of a
short
piece of wire
to lug
#2
of
the
five
lug
strip
(S).
Con-
nect
the
other
end
to
lug
#3
of
the
strip.
If
the
amplifier is
to
be
used
with
a
Dy-
nakit
PAM-1
(monophonic)
preampli-
fier,
this
wire
should
be'
omitted
and
lug
#2
soldered.
Connect
one
end
of a10,000
ohm
(brown-black-orange) resistor
to
lug
#3
of
the
five lug
strip
(S).
Connect
the
other
end
to
lug #1 of
the
strip.
Connect
one
end
of a
4%"
wire
to
lug
#1 of
the
five lug
strip
(S).
Connect
the
other
end
to lug
#3
of
the
bias control
potentiometer
(S).
Connect
one
end
of a21
h"
wire
to
a
mounting
lug
(ground
lug)
of
the
filter
capacitor
(S).
Connect
the
other
end
to
solder
lug
at
mounting
screw of
the
five
lug strip.
8trip
Ih" of
insulation
from
each
end
of
a
5"
wire.
Feed
one
end
through
pin
#8
of
socket
V2
(8)
and
connect
to
pin
#1
(S).
Feed
the
other
end
through
pin
#8
of
socket
V3
and
connect
to
pin
#I.
Connect
one
end
of a2" wire
to
pin
#1
of V3
(S).
Connect
the
other
end
to
pin
#8
of
power
takeoff
socket
(on
front
side
of
chassis)
(8).
Connect
one
end
of
the
13.5
ohm
resistor
to
pin
#8
of V3
(8).
Connect
the
other
end
to
ground
lug
of
socket
V3
(8).
SEE
PICTORIAL.
Connect
one
end
of a
3"
wire to
pin
#8
of
socket
VI
(8).
Connect
the
other
end
to lug #1 of
the
quad
filter
capacitor
(8)
.
Connect
one
end
of a4" wire to
lug
#1
of
the
four screw
terminal
strip
(8)
.
24
25
26
27
28
29
30
31
(!>
(v)
Connect
the
other
end
to
ground
lug
at
the
five lug
strip
(S).
Twist
together
a
pair
of 5" wires
and
connect
one
end
of
one
to
pin
#2
of V2.
Connect
the
corresponding
end
of
the
other
to
pin
#7
of V2.
Connect
one
of
the
other
ends
to
pin
#2
of V3,
and
con-
nect
the
last
one
to
pin
#7
of V3.
Twist
together
a51
h"
and
a
4%"
wire
so
that
one
pair
of
ends
are
uneven.
Connect
the
even
pair
of
ends
to
pins
#1
(S)
and
#2
(S)
of
the
power takeoff
socket.
Connect
the
long
end
to
pin
#2
of V3
(S).
Connect
the
remaining
end
to
pin
#7
of V3
(S).
Connect
one
end
of a10
ohm
(brown-
black-black) resistor
to
pin
#3
of
the
power takeoff
socket
(8).
Connect
the
other
end
to
ground
lug
at
that
socket
(S)
.
Connect
one
end
of a22,000
ohm
resistor
(red-red-orange)
to
pin
#5
of
the
power
takeoff
socket
(S).
Connect
the
other
end
to
pin
#4.
Connect
one
end
of a
5%"
wire to
pin
#4
of
the
power takeoff
socket
(8).
Con-
nect
the
other
end
to filter
capacitor
lug
#4.
(See
application
notes if
other
than
DYN
A
preamp
is to
be
used.) .
Mount
the
printed
circuit
board
in
the
cutout
at
the
end
of
the
chassis.
Note
that
the
socket
is
located
nearest
the
end
of
the
chassis.
The
board
should
be
mounted
from
the
bottom
of
the
chassis
with
#4
screws,
nuts,
and
lockwashers.
The
eyelets on
the
printed
circuit
board
already
have
solder
in them.
Each
eyelet
has
a
number
which
will be referred to
in
the
instructions. Before
making
aconnec-
tion
to
the
board,
"tin"
the
stripped
wire
to
be
connected
by
heating
with
the
sol-
dering
iron
and
touching
solder
to
it.
To
solder
to
the
eyelet,
heat
the
eyelet
with
the
iron,
insert
the
wire
when
the
solder
in
the
eyelet
flows, remove
the
iron
and
allow afew seconds for
the
solder
to set. .
Although
the
metal
eyelet
does
protect
the
printed
wiring from overheating, a
small
iron
should
be
used
to
avoid exces-
sive
heat
on
the
printed
circuit
board.
Connect
one
end
of a2" wire to
eyelet
#1
of
the
circuit
board
(S).
Connect
the
other
end
to
the
ground
(short)
lug
of
the
inpu
t
socket
(S).
Connect
one
end
of a2" wire
to
input
socket
long lug
(S).
Connect
the
other
end
to
eyelet
#2
(8).
Twist
together
a
pair
of 6" wires. Con-
nect
one
end
to
pin
#2
of V2
(S).
Con-
nect
the
other
end
to
pin
#7
(S).
Connect
one
of
the
other
ends
to
eyelet
#4
(S).
Connect
the
remaining
end
to
eyelet
#5
(8)
.
3
INITIAL ADJUSTMENT
Plug
in
the
EL-34's
(see
pictorial)
and
the
7199
tube.
Do
not
plug
in
the
GZ-34/5AR4
rectifier yet.
If
an
ohmmeter
is
available
measure
the
resistance
from
capacitor
lug
#2
to
ground
(chassis).
This
should
be
in
excess of
one
hundred
thousand
ohms.
Inspect
wir-
ing to
make
sure
that
all
joints
are
soldered
and
that
no
parts
are
shorting
together.
Plug
line
cord
into
117
volt
AC
outlet
and
turn
on
switch.
While
tubes
are
warming
up,
set
the
bias
potentiometer
to
the
ap-
proximate
center
of
its
rotation.
This
setting
is
only
approximate
and
the
amplifier
should
not
be
run
without
following
the
directions
below.
Your
Dynakit
includes
Dyna
Biaset
(patent
pend-'
ing) which
greatly
simplifies
setting
of
the
bias volt-
age.
This
can be
done
with
the
most
simple
and
inex-
pensive types of
DC
meters
as
long
as
they
have
a
If
in
the
course
of
bias
setting
it
is found
that
the
control
range
of
the
potentiometer
is insufficient to
obtain
the
correct
setting,
do
not
operate
the
ampli-
fier
until
the
cause
of
the
difficul
ty
is
determined.
Operation
with
incorrect
bias
can
lead to
damage
of
the
output
tubes
andlor
other
components.
Note
that
the
use
of
pin
#8
as
directed
in
the
wir-
ing
instructions
means
that
this
pin
may
not
be
used
as
a
connection
for power takeoff for preamplifiers.
Most
preamplifiers
do
not
require
the
use
of
this
pin;
however if use
of
pin
#8
is
indicated
for
your
particu-
lar
preamplifier,
another
unused
pin
must
be chosen
for abias voltage check point.
If
this is
not
possible,
the
connection
from
the
output
tube
pin
#8
to
the
power takeoff
socket
must
be
omitted;
the
bias volt-
age
meter
reading
may
then
be
made
directly
at
the
#8
pin
of
either
output
tube.
PREAMPLIFIERS
The
Dynakit
Mark
IV
can
be used
with
any
con-
ventional
preamplifier
in
monophonic
or
stereo
sys-
tems.
Preamplifiers
which
are
self powered
are
con-
nected
by
simply
plugging
the
signal
or
audio
cable
into
the
input
socket
of
the
Mark
IV.
Preamplifiers
which
are
dependent
on
apower
amplifier
for
their
power
source
are
readily
connected
to
the
preamp
power takeoff octal
socket
on
the
Mark
IV.
The
Mark
IV
wiring
instructions
include
the
correct
power take-
off
connections
for
both
the
DYNAKIT
PAM-l
pre-
....
rating
of ]
000
ohms
per
volt
or
higher.
The
correct
setting
of
the
bias provides atotal
cathode
current
of
115
MA
for
the
pair
of EL-34's.
This
current
through
the
precision 13.5
ohm
resistor
produces
a
voltage
drop
of
exactly
1.56 volts
DC,
and
this
voltage
can
be
checked
at
pin
#8
of
the
preamplifier
power takeoff
socket. 1.56 volts is
the
voltage
reading
of
a
new
type
Dflashlight cell.
Thus
any
fresh
type
Dcell
may
be
used for
an
accurate
reference for
the
bias voltage
setting.
The
procedure
for
"etting
the
bias voltage is to
measure
the
voltage of afresh
type
Dcell
and
note
the
meter
indication.
Then
insert
the
positive
meter
probe
in
the
pin
#8
hole of the
preamp
takeoff socket.
(Note
that
outside
the
chassis
the
pin
numbers
are
counted
counter-clockwise from
the
key.)
The
nega-
tive
meter
probe
should
be
applied
to
the
chassis.
Plug
in
the
GZ-3415AR4 rectifier tube,
and
in
about
ten
seconds
there
will be a
current
flow
which will
cause
an
indication
on
your
meter.
The
bias poten-
tio'
..
rieter
should
be
adjusted
until
the
meter
indicates
the
same
voltage
as
did
the
type
Dcell.
There
may
be
a
slight
drifting
of
the
voltage
indication
as
the
new
amplifier warms
up
for
approximately
the
first
15
minutes,
after
which
the
bias control
may
be read-
justed.
Thel'€after
slight
variations
may
be
caused
by
small
changes
in
the
supplied
line voltage.
These
variations
will
neither
affect
the
performanc(~
of
the
unit,
nor
will
it
be
necessary
to
readjust
the
bias
set-
ting.
The
bias
setting
is a
semi-permanent
one
and
need
only
be reset
upon
replacement
of
the
output
tubes
or
at
such
time
as
other
repairs
or
maintenance
might
be
required. Arecheck
at
the
time
of
mainten-
ance,
or
after
a
year
or
more
of
heavy
usage, will
hP.lp
preserve
peak
performance
and
keep
distortion
to
an
absolute
minimum.
Connect
one
end
of
a7" wire to lug
#4
of
the
four screw
terminal
strip
(8).
Con-
nect
the
other
end
to
eyelet
#3
(8
l.
Connect
one
end
of a1000
ohm
(brown-
black-red)
resistor
to
eyelet
#9
(8).
Con-
nect
the
other
end
to
pin
#5
of
socket
V3
(8)
.
40
38
37
34
33
32
35
36
Connect
one
end
of a31
h"
wire to lug
#2
of
the
bias
potentiometer
(8).
Connect
the
other
end
to
eyelet
#11
(S).
Connect
one
end
of
a1000
ohm
(brown-
black-red)
resistor to lug
#5
of V2
(8).
Connect
the
other
end
to
eyelet
#10
(8).
Connect
one
end
of
a 31
/2"wire
to
pin
#4
of V3
(8).
Connect
the
other
end
to eye-
let
#7
(8
l.
Connect
one
end
of
a6800
ohm
(blue-
gray-red)
resistor to lug
#2
of
the
quad
filter
capacitor
(8).
Connect
the
other
end
to
lug
#4
of
the
filter
capacitor.
Connect
one
end
of a10" wire to lug
#4
of
the
filter
capacitor
(8).
Connect
the
other
end
to
eyelet
#8
(8).
Connect
one
end
of
an
11" wire
to'lug
#3
of
the
filter
capaci
tor
(8
l.
Connect
the
other
end
to
eyelet
#6
(8).
Separate
the
two
conductors
of
the
line
cord
for
about
21
/2
".
Cut
about
1" from
one
of
the
conductors,
then
strip
and
tin
both.
Insert
the
line
cord
through
the
grommet
from
the
outside
and
push
enough
through
to
tie
a
knot
about
4"
from
the
end.
Pull
the
cord
back
until
the
knot
is
snug
against
the
grommet.
Connect
the
short
lead
to lug A
of
the
fuse
post
(8).
Connect
the
other
lead to
lug #1 of
the
slide
switch
(8).
It
is wise to go
back
and
check
all
connections
for
correctness
and
for good soldering. All
hardware
should
also
be checked for tightness.
The
fuse
can
now be
installed
in
the
fuse post.
The
rubber
feet
should
be
installed
in
the
proper
holes
in
the
bottom
of
the
bottom
plate.
6
amplifier
and
the
Heathkit
WA-P2.
Should
other
units
with different power
plug
wiring
be
used
the
takeoff
socket
may
be rewired
to
suit
requirements.
The
wire
jumper
between lugs
#2
and
#3
of
the
5
lug
terminal
may
have
to be
cut
depending
on
the
type
of
preamp
to
be
used.
This
jumper
should
be
cut
for use when
powering a
Dynakit
PAM-l
preamplifier
or
Heath-
kit
WA-P2
or
any
other
preamplifier which requires
power from a
"floating"
or
ungrounded
heater
sup-
ply.
The
jumper
should
not
be
cut
when
using
any
preamplifier which
has
its own,
or
a
separate,
power
supply.
PROTECTIVE
COVER
The
protective
cover
supplied
with
the
MARK
IV
has
been
designed
to
be
both
functional
and
attrac-
tive.
In
normal
home
usage
the
cover
should
always
be used;
although
the
voltage
at
the
top
of
the
printed
circuit
is
not
lethal,
an
unpleasant
shock
can
be
ex-
perienced,
plus
the
fact
that
the
tubes
in normal
operation
run
hot
enough
to
produce
a
minor
burn
if
touched.
The
amplifier
should
be
located
where
there
is
am-
ple
ventilation-at
least
one
foot of
space
above
it
and
several inches
all
around.
The
amplifier
can
be
located
away
from
other
elements
of
your
system
so
there
is
no
need
to
place
it
in aconfined area.
Never
place
anything
directly
on
the
cover which
might
limit
the
ventilation.
It
is
always
advisable
to
operate
the
amplifier
in
its
normal
vertical position.
The
cover
and
bottom
plate
are
attached
at
the
same
time.
Place
the
amplifier
on
the
bottom
plate,
then
lower
the
cover over
the
unit,
the
tabs
on
the
cover will fit between
the
ends
of
the
bottom
plate
and
the
chassis.
The
three
pieces
are
fastened simul-
taneously
with
sheet
metal
screws
through
the
sides.
IN
CASE
OF
TROUBLE
Your
Dynakit
MARK
IV
has
been conservatively
designed
to
be
as
trouble
free
as
possible.
Error
in
assembly
or
possibly adefective
component
may
affect
performance
or
render
it
inoperative.
Here
are
some suggestions which
may
help.
First
of all
the
wir-
ing
and
assembly
should
be
doubly
checked,
by
some-
one
other
than
the
constructor
if possible.
The
tubes
should
light
afew seconds
after
the
unit
is
turned
on.
If
not, miswiring
or
ablown fuse will
probably
be
the
answer.
Replace
ablown fuse
only
with
the
type
(2
ampere)
originally
supplied.
If
the
fuse blows when all
tubes
are
removed from
sockets adefective power
transformer
or
miswiring is
indicated.
If
one
or
the
pair
of EL-34
output
tubesglow a
cherry
red
after
warm-up,
it
is possible
that
a
tube
is
defec-
tive,
or
there
may
be afault in
the
bias
supply
which controls
the
current
flow of
the
output
tubes.
When
the
biaset
reading
is 1.56 volts
the
bias voltage
at
the
grids
(pins
5)
of
the
output
tubes
should
be
within
20%
of 34 volts
NEGATIVE.
A
VTVM
or
high
impedance
meter
must
be used here.
If
the
volt-
age
at
each
of
the
grids is
not
exactly
the
same, one
of the
.1
mfd
coupling
capacitors
on
the
printed
cir-
cuit
board
may
be
at
fault.
If
one
tube
has
no
negative
voltage
at
pin
#5,
an
open
circuit
exists between the
tube
and
bias supply.
If
no
meter
is
available
and
one
tube
glows, inter-
changing
the
two tubes will
help
indicate
the
fault.
If
the
same
tube
glows
in
the
other
socket,
the
tube
is
at
fault.
If
the
other
tube
glows
in
the original socket
position
then
wiring
or
components
are
at
fault.
The
output
tubes
supplied
with
your
MARK
IV
are
carefully
matched
at
the
factory.
When
replacing
output
tubes a
matched
pair
should
be used,
or
anew
one
should
be rnatched
to
the
remaining
good one.
In
emergencies,
substitution
of tubes
can
be made.
Type
5881
or
KT66
may
be used in
place
of
EL-34's
provided the bias is
readjusted
for these tubes.
Type
5U4
or
5U4GB
can
be
substituted
for the GZ-34/
5AR4 rectifier.
Either
of these
substitutions
will re-
sult
in
somewhat
lowered power
output,
however.
There
is
at
present
no
substitute
for
the
7199 tube.
No
Signal
If
the
momentary
insertion
of
a
small
screw
driver
in
the
input
socket causes a
loud
hum,
the
trouble
is
probably
in
the
associated
equipment.
If
the
ampli-
fier is
at
fault, testing
or
substitution
of tubes
may
help. Voltages
may
be checked
in
accordance
with
the
voltage
chart
provided
in
the
instructions.
Hum
and Noise
If
excessive
hum
or noise is
apparent,
it
is essential
to
determine
whether
the
disturbance
is from
the
power
amplifier or
associated
equipment.
Power
am-
plifiers
are
often
blamed
for noise coming from
the
preamp.
The
quick
and
simple
way
to
determine
this
is to remove
all
but
the
speaker
from
the
amplifier.
If
the
hum
or noise
disappears,
the
noise comes from
other
than
the
amplifier; if
it
persists,
it
can
safely be
assumed
it
is in
the
unit.
Sizzling
sounds
may
be
caused
by poor solder con-
nections
and
occasionally by adefective resistor.
Loud
cracking
or
popping
sounds
are
generally
caused
by loose
tube
elements
and
in
rare
cases adefective
quad
section
filter
capacitor.
In
the
event
that
the
trouble
cannot
be found, fac-
tory
consultation
is
available
at
no
charge
and
service
at
moderate
fees.
FACTORY
SERVICE
AND
GUARANTEE
The
MARK
IV
is designed
to
provide
good service
for along time.
It
is
intended
for
operation
at
the
conventional 117
volt
line
voltage
supply
to
most
homes
and
may
be
operated
at
up
to 125 volts with-
out
problems.
Operation
with
line
voltage above 125
volts will
shorten
tube
and
component
life,
and
is
not
covered
by
the
guarantee.
All
parts
in
the
MARK
IV
are
guaranteed
for a
period
of one
fuB
year
from
purchase
date
with
the
exception of
the
tubes which
are
covered by
the
stand-
ard
EIA
guarantee
of 90 days. Defective
parts
will be
replaced
at
no
charge
if
they
are
returned
prepaid
di-
rectly
to
the
factory
or
through
the
dealer
from whom
the
kit
was
purchased.
Many
DYNACO
dealers
stock
parts
for convenience of replacement.
After
the
guar-
7
antee
period,
DYNACO
will replace
any
non-stand-
ard
parts
at
net
prices.
Many
of
the
components
are
standard
items which
can
be purchased from most
electronic
supply
stores.
If
transformers
are
returned
for factory
repair
or
replacement, they
should
be removed from the equip-
ment
without
cutting
leads short.
If
leads
are
cut
rather
than
unsoldered so
that
they
are
unusable,
the
transformer
guarantee
is void.
In
the
event
the
assembled
kit
does
not
function
properly or breaks
down
after
use,
DYNACO
will
service
the
kit
for afee of $5.00 plus
the
cost
of
parts
which
have
been
damaged
or
are
past
guarantee.
This
service facility is
not
available for
kits
which
are
in-
completely wired
or
which have been wired with
other
than
rosin core solder,
or
in
which changes have been
made
without
factory authorization.
In
addition,
NO
PARTS
WILL
BE
REPLACED
NOR
WILL
ANY
SERVICE
BE
RENDERED
FOR
KITS
WHERE
THE
GUARANTEE
POST
CARD
HAS
NOT
BEEN
RETURNED.
THE
SERIAL
NUMBER
ON
THIS
INSTRUCTION
BOOK
MUST
BE
MENTIONED
IN
CORRESPONDENCE,
PARTS
RETURN,
OR
KITS
RETURNED
FOR
FACTO-
RY
SERVICE.
It
is the factory prerogative to
limit
the
service facility to
one
year
from
date
of purchase.
When
shipping
a
unit
for service, a
note
must
be
attached
specifying symptoms,
the
name
and
address
of the sender,
and
the
serial
number
of
the
unit.
The
amplifier should be securely packed with stuffing in-
side
the
cover to
prevent
the tubes from coming
out
of
their
sockets
in
shipment.
It
should
be placed
in
a
rugged
carton
and
surrounded
with
plenty
of shock
absorbing packing material.
The
original
carton
is
not
suitable
for
shipping
an
assembled amplifier.
Shipping
should
be by
Railway
Express, prepaid;
repaired kits will be
returned
by
Railway
Express
collect for
shipping
and
service charges unless these
are
prepaid. Parcel post is
not
asafe method of ship-
ment
for assembled units.
Dyna
Co. assumes no responsibility
or
liability for
damages
or
injuries
sustained
in
assembly
or
opera-
tion
of
the
DYNAKIT.
MARK
IV
VOliAGE
CHARi
VI
rectifler
GZ34
V2 &V3
El34
V47199
Pin
11.56
DC
290
DC
2440
DC
l140
DC
3 - 432
DC
I42
DC
<n
<n
4370
AC
Ql
432
DC
W
--~
5
;l>
-34
DC*
:>
--;l>
6370
AC
(')
(')
1.5
DC
(')
7 - JI
8440
DC
1.56
DC
145
DC
9140
DC
*This
negative voltage must be measured with a
VTVM
only.
All measurements
on
this
chart
were
made
with a
VTVM.
Other
types of meters
may
give alower indi-
cation
in
some cases.
PARiS
lISi
Parts
of
similar
type
which
do
not
change
performance
may
sometimes
be
included
as
a
matter
of
expediency.
This
will
account
for
slight
variations
in
value
and
appearance.
1Chassis
set
(including
cover
and
bottom
plate)
1Power
transformer-PA-135
1
Output
transformer-A-470
1
Choke-C-354
2
Output
tubes-EL-34
6CA7
1Rectifier
tube-GZ-34
5AR4
1
Driver
tube-7199
4Octal sockets
1
Printed
circuit
assembly-PC-4
1
Filter
capacitor
(quad
@525 Volts)
2Capacitors (50
MFD)
1Selenium
rectifier-Cube
1
Four
screw terminal
strip
1Fuse post
with
rubber washer
and
mounting
nut
1Fuse 2A
1Line cord
1
Switch-SPST
1
Input
socket
1Potentiometer-lO,OOO ohms
1Five lug terminal
strip
1
Hank
of
wire
8
RESISTORS
113.5 ohm precision
21000
ohm
(brown-black-red)
210,000 ohm (brown-black-orange)
110 ohm (brown-black-black)
16800 ohm (blue-grey-red)
1
22,000
ohm (red-red-orange)
1Solder lug
1%
nut
1%lockwasher
1Cable
clamp
8#8
machine
screws
8
#8
lockwashers
8
#8
nuts
19
#4
machine
screws
16
#4
lockwashers
17
#4
nuts
4
Rubber
feet
1
Rubber
Grommet
4
Sheet
Metal
Screws
#6
1
Set
of instruction,>
and
warranty
card
....
II
5
II
III
3 4
MARK
IV
PICTO
-
..
i
\~~~:
-:O~l~
..
~~
==
~
~
= =
~
0 2
=~
-
\ j
~
-~-
@j-
~
III I I
1 2
II
w
Z@
-'
V)
:I:
l-
e>
z
0
-'
..:(
l-
=>
U
RIAL
DIAGRAMS
IIII
7
III
8
III
9
III I II
10
11
III
J
6
12
DYNACO
PC-4
5
III I
I.
t
4
FOUR
SCREW-
TERMINAL
MARK
IV
PICT~
III
3
@; BlK BR
OR
VEL
4(if)
I I
III
2
SWITCH
tII
1
III
FUSE POST
o
, I I I II I II I II I
1'-
PREAMP
POWER
SOCKET
12
INPUT
SOCKET
....
CUTOUT
FOR
PRINTED
CIRCUIT
BOARD
PC-4
-H
10
V3
9
8
7
RIAL
DIAGRAMS
OR.8
BRN.4
BLK.COM.
YEL.16
i
A-470
,
MARK
IV
SCHEI\J
IK
I
I
I
390PF
I
7I
8
47K*
9
7199
6
47
620
270K
2
6
3
105M
.5MFD
4701<
2
330K
3I
I
I
~N~O
I
I
-=
PC
4J
L _
,-----------------,
I
I
I
I
I
I
I
I
I
I
*MATCHED PAIRS
-
4
22K
POWER
TAKE OFF
SOCKET
• 4
~
5EYELETS
ON
CIRCUIT BOARD.
~
,
TO
II
YEL.
-50
..
16
PA-135
YEL.
~
8
E:
-
RED
---
'.4
--
RED
BlK
TO
8
TO
6
:.COM. 1
I
+
30
I:r: II
-
RED. -
--
--
SCHEMATIC
5
QUAD
CAPACITOR
J
/
/
/
.I
PA-135
BIAS
POTENTI
OM
ETER
PC-4
PRINTED CIRCUIT
ASSEMBLY
COMPLETE
YOUR
MUSIC
SYSTEM
WITH
THESE
SUPERB
..
..
,
-"
--
.
FM-3
No
other
stereophonic
FM
tuner
like it! Logical simplicity of control
through full
automation
of stereo-mono switch-
ing, extreme tuning stability,
and
ultra-precise
alignment for lowest ·distortion
at
all signal
levels. Exclusive
STEREOMATIC
multiplex cir-
cuit
eliminates troublesome oscillators; locks in
and signals stereo automatically and silently; no
excess
buttons
to push. Align-it-yourself, front
to back, without instruments. Only premium-
grade components used, for
pennanent
quality.
Available as a
kit
or factory-wired
and
tested.
PAS-3
The
world-famous
Dynakit
Stereo
Preamplifier -designed
to
deliver
the
finest possible music reproduction!
The
choice
of broadcast
and
recording professionals, as well
as
discriminating listeners on every continent. A
complete
master
control
unit
with near-perfect
freedom from hum, noise
and
distortion. Precision
equalization networks guarantee accurate low-
and
high-frequency reproduction from
any
source
material. Versatile switching, plus smooth, ac-
curately calibrated controls; includes
tape
moni-
tor
and
stereo separation controls, plus individual
tone controls for each channel. Available as a
kit
or
factory-wired
and
tested.
write
for
D
VNACO
INC
3912
PO\;.
~Iton
Ave.,
Phila.
4,
Pa.
detailed
literature
,.
Cable
Address:
Dynaco,
Phila.
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