Motorola 14T3 User manual

SERVICE
GENERAL
INFORMATION
RECEIVER
MODEL
BREAKDOWN
Chassis
Model
Type
of
Set
Used
14T3
Table,
molded
plastic:
walnut
TS-114
CHASSIS
-
Television
chassis
TS-ll4
contains
20
tubes
plus
a
14"
rectangular
picture
tube,
The
picture,
sound,
and
scanning
circuits,
together
with
a
full-
wave
rectifier,
are
contained
on
a
single
chassis.
TUNING
RANGE
-Channels
2'
through
13
IF
FREQUENCY
-
Channels
2,
3,
4,
5,
6,
11,
12
&
13:
sound-
21.9
me
picture
-
26.
4
me
Channels
7,
8,
9 &
10:
sound-
27.3
me
picture
-
22.
8
me
ANTENNA-
TA-6
"Bilt-In-Tenna".
Provision
for
connec-
tion
of
an
external
antenna.
ANTENNA
IMPEDANCE
-
300
ohms
POWER
SUPPLY
-
117
volts,
•
60
cycle
AC
current
only
POWER
CONSUMPTION
-
205
watts
AUDIO
OUTPUT
- 4
watts
4545
AUGUSTA
BOULEVARD
CHASSIS
TS-114
MODEL
14T3
MANUAL
CHASSIS
TUBE
COMPLEMENT
Ref.
No.
Tube
Function
V-1
6CB6
RF
Amplifier
V-2
l2AT7
Mixer
-Oscillator
V-3
6AU6
lst
IF
Amplifier
V-4
6AU6
2nd
IF
Amplifi,er
V-5
6AG5
3rd
IF
Amplifier
V-6
6AL5
Video
Detector
V-7
6AH6
Video
Amplifier
V-8
6AU6
Audio
Driver-Limiter
V-9
6AL5
Ratio
Detector
V-10
6J5GT
Audio
Amplifier
v
-11
6V6GT
Audio
Output
v
-12
6SN7GT
lst
&
2nd
Clippers
V-13
6SN7GT
Vertical
Sweep
Generator
V-14
6W6GT
Vertical
Sweep
Output
V-15
6AL5
Phase
Detector
v
-16
6SN7GT
Horizontal
Oscillator
v
-17
6BQ6GT
Horizontal
Output
&
High
Voltage
Generator
V-18
6W4GT
Damping·
Diode
v
-19
1B3GT
High
Voltage
Rectifier
V-20
l4BP4
or
14CP4
Picture
Tube:
rectangular
v
-21
I
5U4G
Low
Voltage
Rectifier
HIGH VOLTAGE
WARNING
Operation
of
this
receiver,
outside
its
cabinet
or
with
covers
removed,
involves
a
shock
hazard
from
the
power
supplies.
No
work
should
be
attempted
on
this
receiver
by•
anyone
not
thoroughly
familiar
with
the
precautions
neces-
sary
when
working
on
high
voltage
equipment.-
CATHODE
RAY
PICTURE
TUBE
H.ANDLING
PRECAUTIONS
Extreme
care
must
be
used
in
handling
the
picture
tube.
This
tube
is
highly
evacuated
and,
dup
to
its
large
size,
is
subjected
to
a
considerable
atmospheric
pressure.
The
handler
should
wear
safety
goggles
and
gloves
for
protec-
tion.
Avoid
nicking
or
scratching
the
glass
by
rough
con-
tact
with
other
objects.
Before
removing
glass
tubes,
discharge
the
capacitor
formed
by
the
inner
and
outer
aquadag
coatings
on
the
tube
by
shorting
the
anode
contact
on
the
side
of
the
tube
to
the
outer
surface
with
a
well
insulated
piece
of
wire,
CHICAGO
51',
ILLINOIS
PART
NO
.
54P701933
Price
15
Cents PRINTED IN
U.S.
A.
Scanned by mbear2k - Jan 2012

l
INSTALLATION
AND
OPERATING
INSTRUCTIONS
RECEIVER
LOCATION
The
receiver
may
be
placed
anywhere
in
the
room,
but
for
greatest
satisfaction
it
should
be
located:
l.
Away
from
any
bright
light
that
may
fall
directly
on
the
screen
or
be
reflected
from
it;
this
includes
win-
dows
and
lamps.
Some
illumination
in
the
room,
off
to
one
side,
is
desirable,
however,
to
prevent
eye-
strain.
l.
To
provide
comfortable
viewing
and
ease
of
opera-
tion.
3.
At
lease
one
-inch
away
from
a
wall
to
allow
for
cab-
inet
ventilation.
This
is
very
important.
ANTENNAS
The
choice
of
a
television
antenna
depends
entirely
on
the
location
of
the
receiver
with
respect
to
all
television
station
transmitting
antennas
in
the
area.
Maximum
pick-
up
is
obtained
when
the
receiving
antenna
is
directly
in
line
of
sight
with
the
transmitting
antenna.
"Bilt-In-Tenna."
All
receivers
using
the
TS-ll4
series
television
chassis
are
equipped
with
the
Motorola
"Bilt-In-
Tenna",
mounted
inside
the
cabinet,
for
use
in
good
signal
areas.
When
this
antenna
is
used,
the
following
precautions
should
be
observed
for
best
reception:
l.
In
order
to
get
maximum
performance
and
satisfac-
tory
pictures
from
the
"Bilt-In-Tenna",
ample
sig-
nals
from
the
television
station
must
be
present
at
the
location
of
the
receiver.
Normally,
the
strength
of
the
signals
will
vary
throughout
the
room
in
which
the
receiver
is
located.
For
this
reason,
better
pic-
tures
will
be
obtained
if
the
receiver
is
tried
in
all
possible
locations
in
the
viewing
room
and
is
then
placed
where
the
clearest
pictures
are
received
from
all
stations.
Avoid
large
metallic
objects,
such
as
radiators,
metal
panels,
etc.
l.
Lamps,
vases
and
metallic
objects,
when
placed
on
top
of
the
receiver,
may
affect
the
~fficiency
of
the
"Bilt-In-Tenna".
Indoor
Antenna.
If
additional
pick-up
is
necessary
an
indoor
antenna,
placed
on
or
near
the
receiver,
maybe
used.
The
antenna
should
be
rotated
and
the
arms
should
be
ad-
justed
for
the
best
signal,
with
no
ghosts
or
reflections.
Normally,
the
arms
should
be
extended
on
the
low
channels
(Z-6)
and
telescoped
on
the
high
channels
(7-13).
Outdoor
Antenna.
The
Motorola
"Bilt-In-Tenna"
or
the
indoor
type
antenna
will
give
satisfactory
reception
in
strong
signal
areas;
but,
if
the
receiver
is
located
in
a
fringe
or
weak
signal
area,
an
outdoor
antenna
is
recommended.
In
areas
free
of
obstructions
and
reflections,
within
rea-
sonable
proximity
to
television
transmitters,
a
dipole
and
reflector
will
prove
satisfactory.
Since
such
an
antenna
has
a
relatively
small
band
coverage,
a
special
antenna
covering
all
twelve
television
channels
should
be
used
if
it
is
desired
to
receive
stations
on
channels
of
widely
separated
frequen-
cies.
I-:ocation
of
the
antenna
should
be
decided
from
the
stand-
point
of
maximum
signal
pick-up.
ln
general,
the
antenna
should
be
broadside
to
the
tFansmitting
antenna
and
should
be
as
high
as
pas
sible.
If
a
reflector
is
used,
the
antenna
should
be
oriented
so
that
the
driven
element
is
closest
to
the
station
and
the
reflector
farthest
away.
Locating
the
antenna
and
lead-in
as
far
away
as
possible
from
highways,
hospitals,
doctors'
offices,
electrical
ma-
chinery,
etc.,
will
help
to
reduce
noise
pick-up
from
such
sources.
Also,
it
is
desirable
to
keep
the
antenna
at
least
six
feet
away
from
other
antennas,
metal
roofs,
gutters,
or
other
metal
objects
to
prevent
unwanted
reflections
and
shielding.
Lead-In.
Since
the
TS-ll4
chassis
i~
designed
for
300
ohm
input,
the
standard
300
ohm
twin
lead
line
should
be
used
for
connecting
the
outside
antenna
to
the
receiver.
Twisting
the
line
one
complete
turn
per
foot
of
running
iength
helps
to
reduce
noise
pick-up
on
the
line.
The
lea.d-in
should
be
supported
on
stand-off
insulators
and
kept
tight
enough
to
prevent
mechanical
damage
through
swaying.
Avoid
running
the
lead-in
close
to
metal
gutters,
iron
standpipes,
etc.
In
areas
of
very
strong
signals,
or
where
severe
local
electrical
interference
is
encountered,
300
ohm
shielded
twin
lead
is
recommended.
The
shield
braid
should
be
grounded.
An
approved
lightning
arrestor
should
be
used.
RECEIVER
ANTF:NNA
CONNECTION
The
antenna
lead-in
to
the
receiver
is
connected
to
the
two
screws
of
the
terminal
strip
on
the
rear
of
the
cabinet.
Disconnect
the
"Bilt-In-Tenna"
leads
from
the
terminal
strip
before
attaching
an
external
antenna
lead-in.
Some-
times,
reversing
the
lead-in
connections
at
the
receiver
may
improve
picture
quality
and
overall
performance.
OPERATING
CONTROLS
There
are
two
dual
controls,
consisting
of
a
small
and
a
large
knob
each,
on
the
front
panel
of
the
receiver.
The
function
of
each
control
is
marked
on
the
front
panel,
the
"circle"
indicating
the
large
knob,
and
the
"dot"
indicating
the
small
knob.
See
Figure
l
for
front
panel
control
func-
tions.
CONTRAST
ADJUSTS SHADES
OF
BLACK a WHITE
OFF-VOLUME
TURNS SET
ON
8 OFF
AND ADJUSTS VOLUME
CHANNEL SELECTOR
SELECTS STATIONS·
NUMBEP
ON
TOP
INDICATES
CHANNEL SELECTED
FINE TUNING
TUNE FOR BEST
PICTURE OETA.tl
FIGURE
l.
OPERATING
CONTROLS
Scanned by mbear2k - Jan 2012

SERVICE
ADJUSTMENT
CONTROLS
The
receiver
is
completely
adjusted
at
the
factory,
so
normally
none
other
than
the
front
panel
control
operating
instructions
need
be
followed
in
putting
the
receiver
in
op-
eration.
However,
to
provide
for
any
misadjustment
of
the
service
controls,
due
to
handling,
the
following
instructions
are
in
order.
See
Figure
2
for
location
of
the
service
ad-
justment
controls.
FOCUS
CONTROL
The
FOCUS
control
should
be
adjusted
until
the
fine
hor-
izontal
line
structure
of
the
raster
is
clearly
visible
over
the
picture
area.
The
control
should
be
tuned
through
the
correct
point
several
times
so
that
optimum
focus
is
ob-
tained.
CENTERING
By
means
of
a
lever
extending
from
the
focus
coil,
thru
the
rear
screen,
the
focus
coil
can
be
shifted
to
center
the
picture
in
its
mask.
VERTICAL
SIZE
AND
VERTICAL
LINEARITY
Adjust
the
VERTICAL
SIZE
control
until
the
picture
fills
themaskvertically.
Adjust
the
VERTICAL
LINEARITY
con-
trol
for
best
overall
vertical
linearity.
Adjustment
of
the
VERTICAL
SIZE
control
will
require
a
readjustment
of
the
VERTICAL
LINEARITY
control
and
possibly
of
the
vertical
hold
control.
Center
picture
with
the
centering
lever
on
the
focus
coil.
HORIZONTAL
SIZE
Adjust
the
HORIZONTAL
SIZE
lever
until
the
picture
fills
the
mask
horizontally.
Center
picture
with
the
center-
ing
lever.
HORIZONTAL
HOLD
ADJUSTMENT
The
HORIZONTAL
HOLD
control
should
have
a
sync
range
of
approximately
180°.
If
the
control
is
too
critical,
adjust
as
follows:
l.
Short
out
HORIZONTAL
OSCILLATOR
coil
L-23.
This
may
be
done
with
the
chassis
in
the
cabinet
by
shorting
pins
3
and
8
of
the
test
socket
on
chassis
rear.
2.
With
the
centering
lever,
move
the
picture
to
the
left
so
thatthe
rightedge
of
the
raster
can
be
seen.
Ad-
just
the
HORIZONTAL
HOLD
control
to
about
the
middle
of
its
range
and
note
the
width
of
the
blanking
pulse.
(The
blanking
pulse
appears
as
a
gray
bar
at
the
right
edge
of
the
picture).
3.
Remove
short
from
HORIZONTAL
OSCILLATOR
coil.
4.
Adjust
HORIZONTAL
OSCILLATOR
coil
until
the
same
amount
of
blanking
pulse
can
be
seen
as
was
noted
in
step
2.
VERTICAL
HOLD
ADJUSTMENT
Adjust
the
VERTICAL
HOLD
control
for
the
center
of
the
vertical
sync
lock-in
range.
BRIGHTNESS
Adjust
the
BRIGHTNESS
control,
in
combination
with
the
CONTRAST
control
for
the
most
pleasing
picture.
Keep
the
brilliance
slightly
below
maximum,
however,
in
order
to
protect
the
fluoresc-ent
screen
of
the
picture
tube
and
to
prevent
poor
picture
detail.
ADJUSTMENT
OF
ION
TRAP
Under
conditions
of
rough
shipment,
it
is
possible
for
,---------DEFLECTION
YOKE
___________
~
MTG
BRKT
STUD
PICTURE
CENTERING
---,.Jf---'tv'
FOCUS
COIL
POSITIONING ADJ STUD
LEVER
HOA
HOl.D
V£RT
HCLD
VU:T
S.Zf
VfftT
U~
@
REAR
SUPPORT
POSITIONING
ADJ
l23
HORIZ
osc
@
FOCUS
BRKT
SCR
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WS
PET.
to&O.
S9t?Oit2~-0
FIGURE
2.
SERVICE
ADJUSTMENT
CONTROLS
POWER
INPUT
3
Scanned by mbear2k - Jan 2012

4
DEFLECTI
ON
FOCUS
COIL
YOKE
POSITIONING
ADJ
USTMENT ST
UD
F
OC
US COIL
POS
ITIONI
NG
--_/
ADJUSTMENT STUD
PICTU
RE
TU
BE
S
UPPO
RT
BRACK
ET
ADJUSTMENT S
CREW
DEFLECTION
YOKE
BRACKET MOUNTING
STUD
RETAINER STRAP
PI
CTURE
TU
BE
FIGURE
3.
PICTURE
TUBE
ADJUSTMENT
LOCATIONS
the
ion
trap
to
become
misaligned.
To
prevent
serious
dam-
age
to
the
picture
tube,
the
following
method
of
adjustment
should
be
used.
See
Figure
3.
The
magnet
shou
ld
be
placed
on
the
neck
of
the
tube
in
the
direction
indicated
by
the
marking
on
the
magnet
(usu-
ally
an
arrow
which
points
toward
the
picture
tube
screen}
so
that
the
stronger
magnet
of
the
double
magnet
type
or
the
only
magnet
in
the
single
magnet
type,
is
positioned
over
the
internal
pole
pieces
which
are
mounted
on
the
gun
structure.
Adjust
the
brightness
control
for
low
intensity
and
move
the
magnet
a
short
distance
forward
and
backward
at
the
same
time
rotating
it
to
obtain
the
brightest
raster.
If,
in
obtain-
ing
the
brightest
raster,
the
ion
trap
magnet
has
to
be
moved
more
than
l/4"
from
the
gun
pole
pieces,
the
magnet
is
probably
weak
and
a
new
magnet
should
be
tried.
Never
correct
for
a
shadowed
raster
with
the
ion
trap
magnet
if
such
correction
results
in
decreased
brightness.
The
ion
trap
magnet
must
a l
ways
be
adjusted
for
maximum
bright-
ness
and,
if
shadows
occur
at
this
setting,
they
should
be
eliminated
by
adjusting
the
focus
and
deflection
coils
as
ex-
plained
under
"Focus
Coil
and
Deflection
Yoke
Adjustment".
CAUTION:
Keep
brightness
control
at
low
intensity
until
ion
trap
is
properly
set.
A
mirrorpl,aced
infront
of
the
receiver
will
aid
in
mak-
ing
this
adjustment.
DEFLECTION
YOKE
ADJUSTMENT
If
the
deflection
yoke
shifts,
the
picture
will
be
tilted
.
To
correct,
loosen
the
thumbscrew
on
top
of
the
deflection
yoke
and
rotate
yoke
until
the
picture
is
straight.
Before
tighten-
ing
the
thumbscrew,
make
certain
that
the
deflection
yoke
is
as
far
forward
as
possible.
If
the
yoke
support
and
the
picture
tube
hav
e
shifted
in
transit
or,
if
for
any
reason,
these
parts
have
been
removed
and
replaced,
it
is
best
to
do
a
complete
job
of
repositioning.
See
'
Figure
3.
The
starting
point
is
the
position
of
the
pic-
ture
tube.
It
should
be
adjusted
so
that
the
distance
from
the
center
of
the
tube
face
to
the
front
edge
of
the
chassis
is
l
".
The
clamp
on
the
front
of
the
tube
should
then
be
tightened.
The
picture
tube
rear
support
bracket
position
-
ing
adjustment
screws
should
be
loose
enough
to
permit
sliding
the
bracket
forward
until
the
rubber
cushion
fits
snugly
up
against
the
flare
of
the
tube.
Loosen
the
yoke
ad-
justment
thumbscrew
and
push
the
yoke
up
against
the
flare
of
the
tub
e .
CAUTION:
Do
not
use
force
in
sliding
the
brack-
et
up.
If
too
much
force
is
used,
a
strain
will
be
placed
on
the
neck
of
the
tube
when
the
support
bracket
positioning
ad-
justment
screws
are
tightened.
Also,
the
yoke
may
be
forced
out
of
position.
The
opening
in
the
yoke
should
be
concen-
tric
with
the
neck
of
the
tube.
FOCUS
COIL
ADJUSTMENT
The
focus
coil
should
be
positioned
so
that
it
is
spaced
l/4"
from
the
deflection
yoke
when
parallel
with
the
yoke.
The
opening
in
the
yoke
should
be
concentric
with
the
neck
of
the
tube
.
The
spacing
should
be
adjusted
before
the
front
of
the
picture
tube
is
clamped
down,
because
it
is
ne
-
cessary
to
remove
the
tube
to
change
the
position
of
the
focus
coil.
Its
position
is
changed
by
choice
of
location
of
the
coil
mounting
studs
in
the
scalloped
holes
on
the
top
and
bottom
of
the
coil
mounting
bracket.
The
opening
in
the
coil
can
be
made
concentric
with
the
neck
of
the
tube
by
loosen
-
ing
the
nuts
on
the
studs
which
support
the
focus
coil
brack-
et
and
turning
the
studs
with
a
screwdriver
in
the
slots
pro-
vided
.
The
studs
are
eccentric
and
move
the
coil
both
ver-
tically
and
horizontally.
They
shou
ld
be
used
only
to
cen-
ter
the
neck
of
the
tube
in
the
opening
of
the
coil.
TEST
SOCKET
A
test
socket
is
provided
on
the
rear
of
the
chassis
which
allow
s
adjustment
of
the
horizontal
oscillator
and
checking
of
:;ensitivit'y
without
removing
cha
s
sis
from
cab-
inet
.
See
Figure
2
for
socket
connections.
Scanned by mbear2k - Jan 2012

GENERAL
The
chassis
should
be
mount
e d
on
angle
iron
bracke.ts
(Motorola
Pa"I"t
No.
7X7"00210)
so
that
all
connections
and
adjustments
may
be
·
made
easily.
Since
the
power
cord
circuit
is
broken
by
the
interlock
when
the
cabinet
back
is
removed,
it
will
be
necessary
to
obtain
an
extra
power
cord
with
the
female
interlock
recep-
tacle
in
order
to
make
a
power
connection
to
the
receiver.
Order
Motorola
Part
No.
30B470756.
ORDER
OF
ALIGNMENT
A
complete
receiver
alignment
can
he
m<Jst
conveniently
perform.ed
in
tbe
·
tiollowing
order
~
l.
Audio
Take-Off
&
Ratio
Detector
2.
4.
S
Me
Trap
3.
IF
Coils
&
Mixer
Transformer
4.
Osc
&
RF
Sections
AUDIO
TAKE-OFF
&
RATIO
DETECTOR
ALIGNMENT
Equipment
Required:
AM
Signal
Generator:
Accurately
calibrated
(Optional)
at
4.
5
me
Adjustable
output
DC
Meter:
Low
range
electronic
voltmeter
.
Procedure:
Refer
to
Figure
4
for
location
of
adjustments.
1.
If
possible,
it
is
desirable
to
align
the
audio
section
from
an
actual
station
signal,
since
the
4.
5
me
align-
ment
frequency
will
be
exact.
The
fine
tuning
trim-
mer
should
be
turned
off
the
station
slightly,
to
pre-
vent
overloading
the
ratio
detector.
2.
If
a
signal
generator
is
used,
tune
it
accurately
to
4.
5
me,
and
adjust
the
output
to
approximately
10,000
microvolts.
Connect
the
high
side
of
the
s
ignal
gen-
erator
through
a
1000
rnmf
capacitor
to
the
grid
(pin
1)
of
the
video
amplifier
tube
V-7
(6AH6),
and
the
low
side
to
chassis.
The
following
applies
whether
the
station
signal
or
signal
generator
is
used.
3.
From
either
side
of
capacitor
C-52
(10
mf),
connect
an
electroni
c
voltmeter
to
chassi
s
decoupled
thru
lOK
ohms.
4.
Set
the
contrast
control
for
maximum
gain
(fully
clockwise).
5.
Peak
L-20
for
maximum
reading
on
meter.
6.
Peak
T-3
primary
(top
core)
for
maximum
reading
on
meter.
7.
Move
the
meter
and
decoupling
resistor
from
C-52
to
junction
of
R-41
(33K)
and
lead
to
volume
control.
8.
Adjust
T-3
secondary
(bottom
core)
for
zero
re-
sponse
on
2.
5V
scale
of
meter
.
This
corresponds
to
the
cross-over
point
on
the
FM
detector
curve
.
If
desired,
the
symmetry
of
th
e
curve
may
be
check
ed
by
tuning
the
signal
generator
25
kc
above
and
below
4.
5
me
and
noting
the
plus
and
minus
voltage
pro-
duced,
reversing
the
meter
connections
as
neces-
sary.
Fo.r
proper
balance
of
the
ratio
detector
sys-
tem,
the
voltage
in
each
direction
should
be
approxi-
mately
equal.
lf
not,
check
the
tuning
of
L-20
and
the
primary
and
secondary
of
T-3.
the
ratio
detec-
tor.
If
nec.,
s
sary,
replace
the
ratio
detector
tube
V-9
(6ALS).
It
is
d ..
sirable
to
calibrate
the
genera-
t<Jr
on
a
station
signal.
This
may
be
done"
by
nulling
the
secondary
on
a
station
signa]
and
then
connecting
the
generato
.r
and
tuning
it
to
produce
the
same
null
without
touching
the
trimmers
in
the
set.
NOTE:
As
the
adjus
.
trnents
are
brought
to
resonance,
it
is
advisable
to
reduce
signal
generator
output
to
prevent
over
loading.
With
a
10,
000
microvolt
sign\'1
into
the
grid
of
the
video
amplifier
tube,
with
the
contrast
control
turned
fully
clock-
wise,
and
the
focus
control
at
center
of
its
range,
the
volt-
age
read
from
one
side
of
capacitor
C-52
should
be
greater
than
5.
OV.
4.
5
MC
TRAP
ALIGNMENT
l.
Connect
the
high
side
of
the
signal
generator
through
a
1000
mmf
capacitor
to
the
grid
(pin
l)
of
the
video
amplifier
tube
V
-7
(
6AH6),
and
the
low
side
to
chas-
sis.
2.
Connect
the
voltmeter
and
germanium
crystal
rec-
tifier,
as
shown
in
Figure
5,
between
the
cathode
of
the
picture
tube
(yellow
lead)
and
chassis.
Use
th
e
lowest
voltage
scale
on
the
m e
ter.
3.
With
the
signal
generator
accurately
set
at
4.
5
me
and
maximum
output,
adjust
trap
L-18
for
minimum
reading
on
the
meter.
IF
AMPLIFIER
ALIGNMENT
Equipment
Required:
IF
Sweep
Generator
meeting
the
following
requirements:
18
to
30
me,
approximately
12
me
sw
e
ep
width.
Out-
put
constant
and
adjustable
to
at
least
• l
volt
maxi-
mum
with
accurately
calibrated,
adjustable
markers.
Cathode
Ray
Oscilloscope:
preferably
one
with
a c a
li-
brated
input
attenuator.
NOTE:
If
there
is
no
built-in
m a
rker
in
the
sw
e
ep
ge
n-
e
rator,
loosely
couple
the
output
of
an
accu-
rately
calibrated
AM
sig
nal
generator
to
th
e
IF
strip.
At
all
times,
keep
the
marker
output
low
enough
to
pr
e
vent
the
marker
from
distorting
the
response
curve.
If
a
wide
band
scop
e
is
used,
the
marker
will
be
more
distinct
if
a c
apacitor
of
100
to
1000
mmf
is
placed
across
the
scope
input.
Use
the
small-
est
size
possible,
since
too
large
a
value
will
affect
the
shape
of
the
curve.
Procedure
:
1.
R•·move
high
voltage
generator
tube
V
-17
(
6BQ6GT)
from
its
socket
to
eliminate
horizont
a l
pick-up
in
th
e
5
Scanned by mbear2k - Jan 2012
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