Technical information

O
RADIO
RETAILING'S
,',
e/rui@
KADETTE
KADETTE
K634
Present
\\'a\-e
trap is
rrot sufficient
to
stop
code
irrterfercrrce.
Disconnect
wave
tlap entireh- irrd
corrnect
it's
coil in
series rvitl-r
rerl s ire fronr band
switch
to antenna
coil. Connect it's
trinrrner
directlv across
trap coil.
KADETTE IOI9
Takes
too long
to warnt up,
poor
tone.
Condenser
pack
leaking
to
cltassis, replace.
rvhole
pack.
KADETTE
I2OO. ST. REGIS
22OO
Hard
to align,
distortion on
locals.
several images
on
high
end
of band
No a.v.c. wire in r.f. stage. Cut
grid
return to a.v.c. network
between .5
and
.l
meg resistors.
Realign
at 488
kc.
Intermittent .
. check
condenser
be-
tween diode load and high side of
vol
ume control
or betlveen 6C5
plate
and
6F6
grid
for open.
KADETTE I2OO. 22OO
Distortion
on strong
locals
no
a.v.c. is incorporated
in original
wiring
causing
6rst
detector
to over-
load.
Insert
.0001 mmf condenser
be-
tween
grid
of this tube and
condenser
gang.
Also connect 2
meg.
resistor
from
grid
to
ground
and I meg. from
grid
back to i.f. transformer side of
second detector
load resistor.
This
pro-
cedure will supply
an a.v.c.
voltage to
6rst detector.
KADETTE
Common
trouble
is
usually
the
fail-
ure of the dual .5 nrfd condenser:
this
is
caused by the heat
generated
by
the line dropping
resistor.
Replace
lesistor rvith
290 ohnr line cord.
KELLOGG
KELLO66 523, 525
Hum .
.
Connect
a .02 ffiO
volt con-
denser
from high
voltage contact
on
80
tube socket
to
ground.
Try
both
con-
tacts as one
is
more effective than the
other.
KNIGHT
B.I0563
Noise rvhich
disappears
u'hen set
is
rentoved from cabinet may be due
to dial escutcheon rubbing against.tin-
foil
inlaid
dial.
Ground
escutcheon by
running rvire from it
to chassis.
LAFAYETTE
LAFAYETTE
M83
A continu:rt
crackling
noise,
covering
weak broadcast
stations
and
short
waves
. replace volume
control with
j
meg
linear
control.
28
L'TATRO
L'TATRO 32 VOLT SETS
Low
volume, vibrator buzzes .
check the condenser
across
the
plates of
the
84 rectiEer for
leak
or
short.
This
condenser
is located directly
under
the
84
socket
and
is
covered by a
tin
shield.
Remove
the
shield and condenser; re-
place
with
.006
1500
volt
unit.
MAJESTIC
MAJESTIC
9P3
Detector
plate
choke
frequently
opens
. . .
Can
be replaced
with
a
25,000 o!"n,
l-watt
resistor'
MAJESTIC
I5
Weak
or
dead
oPen
second
i.f. coil.
MAJESTIC
I5
Dead
try
'a
rrew 2-lA
tube
in
the
oscillator
socket.
Sonre
tubcs
rvill
oscillate
strougly,
while
otlrers
not at
all.
MAJESTIC
16
Irregular
volume, dead
spots
replace G5l
tube
with
'24
and
ground
cathode.
MAJESTIC
I5
Dead
check
.l
nrfd. condenser
in
plate
circuit
of
oscillator-detector.
If
this
is shorted
it
burns
the 2000 ohm
plate
draping
resistor.
MAJESTIC 15. Set
dead although
volt-
ages check
ok
Place blanket
over
lrack
ar.rd
let run
frorn
3 to
4 hours.
MAJESTIC 15.
Operates satisfac-
tory only
at
certain
positions
of
the
dial
.
.
. Try changing
6rst
detector-os-
cillator cathode
resistor to 5.000 ohms.
instead
of the original 10,000. The trrbe
is
probably
overbiased.
MAJESTTC
15,
55
Restoring
lost
sensitivity
. .
. Connect
fixed
condenser of about .0005 between
the two
stator
sections of the
pre-se-
lector and
tuning sections
of the
gang
condenser.
In other words,
between
the
grid
of the first
tube and
the sec-
ondary of
the
pre-selector
coil.
Re-
align.
MAJESTIC 20. Section of voltage
divider heats excessively
.
Probably
a shorted .1 mfd.
bypass condenser in
the intermediate transformer. Connect
new unit
externally.
MAJESTIC 20. Continuous
sizzling
. Open
chassis at
left side
fronr rear
(tone
control side) by taking
out side
flap.
(Bottom
cannot be
removed
with-
out
unsoldering
chokes.) Clip tone
corr-
trol
condenser lead. Although
switch
cuts
this out many users
don't know
it
is
a tone control
and
it is usually
janrnred
on low
tone shortly
after the
purchase.
Replace, if
tone
control
is
used. with
03 mfd.. 600 volt tubular.
MAJESTIC
20.
Testing with
separatc
nleters .
. . Cut
loose 3 wires
on
end of
chassis
running to
by-pass
condensers.
Solder
8 inch
jumpers
between
ends
of
severed
leads.
Then clip the
string
cabling these
leads
and the bottonr
cau
be
pulled
far enough away
to
give
com-
plete
access to
voltage
divider and
other
part
s.
MAJESTIC
20
Weak or
no reception,
low voltage . .
.
shorted .l
rnfd.
condenser
in first I.F.
transformer
can.
It
is
unnecessary
to
melt tar: remove can and
slit on side
near red lead.
Bend metal back and cut
loose offending
condenser. Replace
can
and
install new .l mfd. 600 v. condenser
on
outside.
MAJESTIC
4,.49,
t91
(CHASSIS
4401
Dead,
rvith
pinkish glow
in rectifier
.
high voltage arcs over to chassis
from
tube
prongs
of
rectifier
due
to
small
chassis
cutout
for
socket.
Arc-
ing causes
socket
to
carbonize, neces-
sitating
replacement.
Before remov-
ing
damaged
unit, rnake six
pencil
marks
around
circumference
of
socket
hole.
(one
opposite each
plong
hole
of
socket)
Then
rernove
socket,
mak-
ing
note when
unsoldering
leads
as
to
what
terminals
thel' came
f
rom.
Now,
with a tapered-blade
hack-saw,
cut out notches
arottnd circumference
of
hole at
points
marked
with
pencil.
l\{ake
notches sufficieutly deep
and
wide
so that
when new socket
is installed
there
will be ample clearance
between
tube
prongs
and chassis to
prevent
repi-
tition of trouble.
The
job
can be
made
neat if the
notches are rounded
with
a small
rat-tail
file.
MAJESTIC
11, 49,
t91
llum,
reception blanketed
by oscil-
lation
open section
in
6.4
m{d.
electrolytic
condenser
block.
MAJESTIC
11, 19,
t91
l)istortiorr.
clrcclt
[()r
()lx'll
ol'
rlccrc:rsc<l
c;rlr;rcit-r'
irr
clcttrol.r'tic
Iiltcr-
Irlocl<.
MAJESTIC 50
Fading.
. . . Check
first audio
trans-
former
rvhich
is condenser-choke
couoled.
MAJESTTC sO. Replacing
dial bulb
without removing two knobs,
screws
and
other
miscellaneous
parts.
.
.
Re-
move
dial
escutcheon
held
by
4
small
nails. Turn
dial to 1,500 and remove
end screw
that holds
dial strip.
Insert
bulb
and backtrack
process.
MAJESTIC
50
Ntotorboats
check
.001 mfd
grid
condenser
and
100,000 ohm
grid
resistor
on
27 oscillator for
change in
value.
I
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