Technical information

O
RADIO
RETAITING'S
",
a,ui@
MAJESTIC
908.
Internuttent
re-
ception
Sometimes
defective
choke
in r.f.
lead. To renredy, short out
choke.
Performance is
not noticcablv imoaired.
MAJESTIC
eoB.. Fading...Re-
place
detector cathode bypass
condenser.
Check 27's.
MAJESTIC 9OB.
No
plate
volt-
age, trouble apparently in
powerpack
.. .
Disconnect
leads between
pack
and
set,
turn current on
for 45
seconds.
UAJESTIC 90,
908. Hunr,
sounds
like noise fronr
small motor
See
that
antenna and
ground
wires have
not
been
reversed,
or that
ground
connec-
tion
has
not
gone
bad
MAJESTIC
908, 100B.
Noise, motor-
boating.
Generally
traceable
to de-
fective
.5 mfd.
r.f.
by-pass condenser.
MAJESTIC
90,
908,
1008.
Rejuve-
ndting
the appearance
of the dial
Remove
all
paint
with alcohol
and wipe
the
dial dry.
Then repaint
with black
Duco
Let
the
paint
dry
and then rub
it
with fine
steel-wool
dipped in crude
oil. The raised
numbers
will shine like
a new
assembly.
Whcre numbers
are
stamped in
with
a sharp indentation
the
paint
may
be cut
out
with a knife if a
black body
and light
scale is wanted.
Or the dial
may be rubbed
down,
giving
a
brass
body and
black numbers.
This
process
can
be used
on other
makes
of
receiver,
for
example,
the Stromberg
335,
338, 41
and
42
has
a stamped
dial,
MAJESTIC
90, 92. No signal. Check
variable resistor located
on end of con-
denser
gang.
Many
sets
work
better
when resistors
ari
removed
and
toose
wire carried to
ground.
MAJESTIC
91, 92. Motorboating.
Inspect flexible
lead
soldered
to
sliding
arm attached to trimmer
cup. After
a
time this wire
wears. breaks.
MAJESTIC
90, 91, 92.
If
analysis
shows
no
detector
plate
voltage clip the
wire between
the second
and third
lugs
from the
top of the condenser
block for
a temporary
repair with slightly
reduced
volume.
MAJESTIC 92
Lorrd
hunr nrodrrlating
signal,
tlisap-
pears
rvhen
station is tuned out
remove
cover fronr
power pack
and
connect
.1
mfd
condenser from
ground
to one side
of a.c. line.
Try both sides
as
one
is more
effective.
Heavy
frying noise in
spcaker
take ballast
apart and
disconnect
iong
screrv running
through porcelain
in-
.sulator,
clean top of
ballast with sand-
papcr;
also clean
screw.
IIAJESTIC 1008.
Ok on
phonograph
side
of
switch
but n.d.
on radio
. . .
Bare, twisted wire
which connects
in-
side the switch
to chassis, for
ground,
breaks. Caused by continuous
use oi
switch.
Solder
lead
from
terminal I to
ground.
Switch is numbered
from
I
to
12.
MAJESTIC
1008. Cutting
irt an
out.
Check by-pass
corrdensers across
cathode
resistors
to
grouncl.
l'here
are
tn'o in metal containers. Iteplace dc-
fectives
with I mfd. units.
MAJESTIC
102, 103.
Fading.
Trace-
able to
pickup
transformer
located
on
right of
cabinet
midway between
shelves
supporting
chassis
and speaker.
Ifcard-
board covering one
end of unit is
found
to
be
warped one of the
terminal lugs
generally
makes
contact
with the trans-
former core. Vibration
from speaker
thus causes trouble. Unsolder
the lead
from the termiqal
lug
and
bring the
wire up
directly
through
the
hole in the
cardboard
and resolder in
place.
MAJESTIC II6
Weak, checks nornral
replace
G58AS
in
the second
i.f. arnpli6cr
stagc
with
a 78.
MAJESTIC I30
Fading,
poor
sensitivity
. check
.04
mfd
condenser
furnishing the cou-
pling
for the band
pass
tuner. There
are three
of these
mounted on a
ver-
tical
upright
to
which the
gang
con-
denser is mounted.
Reolace
all three
condensers.
MAJESTIC I3OA
Fading Defective .04
con-
rlenser
bypassing 500-ohm resistor
be-
tween
secondary
of
last
r.f. transfornrer
antl
chassis.
I-ocated
untler
tuning
condensels,
accessible
by rentovihg
tuning
condenser
shield.
The resistor
is inside
the r.f. coil.
MATESTTC
|
30A.
Flat
tone
and
loss of votunre,
all
voltages
correct .
.
.
Check speaker
field
coil for
open. An
analyzer will
not
show
this fault if
tests are run
from the
chassis.
MAJESTTC
t30,
tt0-A,
t3 t,
t32
No reception
tcst
for
short in
0.3 nrfd.
conrlenser,
bypassing
plate
supplv
of first
and
second
r.f.
stages.
Also
check
,1.875
ohnt
resistor
in
same
circuit
for rlecrease
in value.
Recom-
nrended
t'atillgs
of replacentent
units
:
condeuser,
-100
r-olts;
resistor,
l0
\\'atts.
MAJESTIC
200
SERIES.
Gener-
MAJESTIC
2OO
Regenerative whistle
.
ungrounded
shielding on
one of the 5l
spray-
shielded tubes.
Connection
to the
shield
rnay
be made
by wrapping
a few.turns
around the envelope
and
grounding
to
tlre
cathode
prong.
MAJESTIC 290.
Volunre calrnut
be cut down
sufficiently
Look for
defective
l0-nrike condenser
frotn ca-
thode of 57 to
plate
of 58
noise-sup-
pressor
tube. Open
circuiting is corn-
Ill
on.
MAIESTTC 290.
Inoperative
suppressor control
Caused
generally
by leaky or
shorted
10-mike,
50-volt
condenser marked
C-8
on diagram and connected from
G5Z
audio tube cathode to
one end of volume
control.
Distortion
. . .
If
present
only
when
volume
control is
advanced
look
for leaky
C-10 or C-20 audio
coupling
condensers.
MAJESTIC
3OO SERIES
Dead
test for
sholt
in
0.25
rufd. condenser,
by-passing screen of
G-58-S in
r.f.
stage. Unit
is
com-
ponent
of by-pass cotrtainer with
lug
terminals. Also
check center winding
of resonance reactor for open.
Signals
fade out completely after
short
pcriods
of operation
. .
.
)-meg.
resistor,
connected between
cathode
and suppressor
of
G-57-S
in
first a.f.
stage, is likely defective.. If
short
placed
across
terminals restores
oper-
:ttion, replace resistor.
Tuning
light inoperative
look
for
slrort
irr low
voltage, 20
mfd.
electrolytic
condenser
shuntecl across
ccnter wintling of resonance reactor.
r\lso
note
voltage lating
of tuning
liglrt
bulb
in
use. It
should be 2.5-.
volt
type.
A
6-volt lanrp
will light
but will
not
clirn on resonance.
MAJESTIC
300A.
Volume
low,
peakitfu
at
midpoint of volunre
control
setting
Replace
.1
condcnser
in
square
can.
This unit
has white
rubber
covered leads
and conrrects
between
one
end
of
the volrrrne
control
and
the
grid
circuits
of
the
r.f.
and i.f.
tubes.
Set
plays
for moment
v''hen first
turned
on
but then
quickly
chokes
off
.
.
. Re-
place.25
condenser in
same
can
as
above, one
side
grounded,
red
lead.
MAJESTTC
300.
Whistting and
squealing on each
station tuned in, also
low volume
Generally
due to
open
condenser
Cl0,
a .l mike unit in
plates
of
push-pull
detector circuit. Replacing
original Majestic
tubes in i.f. and
r.f.
circuits with standards
.
. .
Cover
glass
of conventional
tubes
with
shellac,
then
stick
tinfoil over
glass,
forming
close-
fitting
shield. Twist
piece
of bare cop-
per
wire
over foil
just
above tube
base
and attach
to cathode of tube.
ally
poor
reception
. . . Rl,
a 15,000-ohnr.
and
R2,
a 20,000-ohm
resistor,
both in
the
voltage
divider,
connected from
plates
to screens
and from
screens
to
cathode
coil
of
the
first
detector,
change
value.
Replace
with
l0-watt
type.
Also
replace
entire
can
containing
C5, .03
coupling
condenser,.04,
a.1 mike
6rst
detector
cathode bypass
and
C3, a .25
mike
r.f.
cathode
bypass.
Leakage
is
common
between
these
units
and is
sometimes
of
the
order
of
trpo
to
three
megohms.
MAJESTIC
2OO
Continual
frying
noisc
replace
volt:Lgc rlivi,ler
( R,R,R,R.R,,
t.
3l