Technical information

r
O
RADIO RETAILING'S
".
qZdre
WELLS
GARDNER
5E
Noisy
replace
con<lenser
be-
tu et'rr
plate
of
34 i.f.
and
grirl
of
secontl
(letector.
This
is
a special
capacity
but
can be
replaced
with
a
.0001 rrrfrl
nrica
unit.
WELLS-GARDNER
20
(GULBRAN.
SEN 23). Failure
of
40,000
ohm
yel-
low resistor
mountcd
on voltege
di-
vider .
.
.
Due
to overload.
substitute 2
watt unit. The
resistor
goes
from
drrt
a,f.
plate
transformer
B
plus
to
B
plus
of
power
pack
or
to low
voltage end
of
field
used as chokc
and is a filter
unit.
WELLS-GARDNER
20
(Gulbrenron
23,
Grifttfr
20).
No
volume
Check
40,000
ohm
carbon
resistor
at-
tached
to
cnd
of
Candohm,
wired be-
tween
plate
of lst
a.f.. 27
and
grid
of
47's. If
defective,
replace
with 5 watt
size
of
game
resistance
and reptece
,5
mfd.
bypass,
in
the condenscr
block
(red
wire)
with
external
.5 mfd.
unit
rated at
600 volts.
Intermittent
or fuzzv
reception Check and, if necessa.y,
replace
.1
mfd., 600 volt end
.05
bypass
condensers.
WELLS
CARDNER
2.7
Poor
tone,
weak replace
.0I
mfd.360
v.d.c.
condenser (part
No.
46 x 120)
with
600 volr unit.
WELLS
GARDNER
40,
.tOA
Bad
distortion
at low
volume
. .
remove
all wires
from
dummy lugs
or-r
candohm
resistor.
The
lugs
can be
identified
by the
double layer of
in.u-
Iating. paper
at
these points.
Interac-
tion
takes place
between
the a.v.c.,
vol-
ume
control
and
grid
bias due
to
leakage
benveen
these lugs.
Also,
change
the
40,000
ohm
resistor
(R16)
to
500,000
ohms.
WELLS
GARDNER
752.
754,
756
\\/eak
on all
stations
check
volume
control
for grouncled
rotor.
WELLS
GARDENER
OEL
Distortion
on strong
stations
when
tuned
exactl)'
to resonance,
reception
normal
when
detuned
slightly.
. . . Bal-
ance
i.f.
as
one transformer
is
badlv
out
of alignment.
WESTINGHOUSE
WESTINGHOUSE
WRs
(Grettrr
t00,
GE H3l).
To
snap
ui rinei
tivity
,
Remove
shicld from-frst
ia-
termediate
frequency
transformer.
WESTINGHOUSE
U6F
Distortion
check.0l nricl
200
v,
rlt
coupling
corrderrser for high le-
sislatrct'
leakage
(about
20 rneg.)
WESTINGHOUSE
WRs,
6,
7, 8.
Poor quality
and
low volume
.
. Look
for grounding
of
strip
of resistors
under
chassis,
lowering
C bias
to
power
tubes.
Grounding
occurs
when
heat
expands
re
sistors.
WESTINGHOUSE
WRI2
Dead
.
. look
for
i.i.
trinnner
lugs
:lrorted
lo wirrrlirrg.
WESTINGHOUSE
WRI.T
Can't
control
volurne
on
strong
locals
even
with
anlcnna
disconnected.
The
r.f.
coil
and volume
control
leads
are
unshielded
supplying
sufficient pick-
up.
Shield r.f.
coil
with large
tube
shield
or other
shield
can.
Also
re-
place
8 rnfd
wet electrolytic
with
drv
unit.
Shield control grid
lead
of
firit
24
tube.
WESTINGHOUSE
WR2I
Noisy,
when
walking
across floor
or
bumping
the
set
Socket
prongs
lose
their
tension
and fail
to make
good
contact
with
tube
pins.
WEST|NGHOUSE
WR2o3,
303
Excessive
code
interference.
Set
IFs
to 450
and carefully
adjust
wave
trap
to minimunr.
Rc-align
all
circuits.
If
antenna
coupling
transformer
is
used,
bolt
directly
to
chassis
and
run
wires
to
set from
it
as short
as
possible.
Run
64,8 grid
lead
down
along
con-
denser'gang
as
close
as
possiblJ.
wESTtNGHOUSE
WR-203,
WR_303
No reception
.
. look
for
short in
0.1
mfd., 400
volt
tubular
condenser
bypassing plate
supply
of 64.8
anrl
6K7
i.f.
stage.
Use 600 volt
replacement.
WESTINGHOUSE
3I5 WR
Noisy,
cracking
.
. check
95
ohm
choke
under
i.f.
transfonner
locatcd
betn'een
6.4'8
sockets.
Replace
with 2.50
ohm resistor.
A.f.c.
operates
only
ldrcn
approach-
ing
station
froin
high
frequency
side.
Connect
150
ohm
resistor
across
140
ohnr
sectiorr
of large
voltage
divider
on
undcr
sitle of
chassis
and realign
i.i.
arrtl tliscrirrrinalor
WINDCHARGER
WINDCHARGERS
When the
charge
rate
cannot
be
made
to
exceed
three
or four
amperes
check
the lugs
on the
collector
arm leads
for
good
contact.
In many
cases
the lugs
are crimped
on
the lead
instead
of
sol-
dered.
Solder
all connections.
WURLIIZER
SUPERHETS
Noisy
.
.
.
I.F.
coils
wound
with
6
strand
litz,
failure
of
one strand
won't
show
up
on ohmmeter
but
increases
R.F.
resistance.
Cut leads,
fray
and
scrap
each
strand
separatell
"nd
r.-
solder'.
ZANNEY
GILL
ZANNEY
GILL
Oscillation
Check
all bypass
returns which are made to rivets.
Soldering these rivets to the chassis
will
effect a
cure.
ZENETTE
ZENETTE
CH SIRIIS.
Excessive
regeneration
and
no
volume
.
. . Often
due to
defective electrolytic
Iocated in
square
can at
far end of
chassis
(left
side) bypassing
choke
lo-
cated
underneath
chassis.
Choking up
when volume
control
is
advanced
or
tuning
dial
shifted
Caused
by
500,000-ohm
plate
resistor
in
a.v.c. tube
dropping
in value.
ZENETTE
A,
B,
C, D.
Erratic
operation,
squeals,
overall
efficiency loss
.
Replace
25,000
ohm
series
plate
re-
sistor
with same
value
in
l0
watt size.
Check
all high
value
resistors
in
de-
tector
platc
circuits
Lor 25
per
ccnt
change
in value,
also I megohm
rcsistor
in first
r.f.
grid
return.
If set
is radio-
phono
combination
kcep
wire from
phono
switch
a3
far
away from
receiver
circuits
as
possibte.
Put .00025
con-
denser from
detector
choke
to
ground
for
greater
stability.
ZENITTI
ZENITH
.IBI06
EOAT
RADIO
Dead
on
low flequency
end
of
dial
. connect
10,000
ohnr resistor
across
15
tube.
This
lowers
the bias
sufficiently
to nrake
the
tube oscillate.
When too nruch
nroisture
collects
on
the coils
of
this set it
often
beconres
inoperative.
To lemedy:
IJuscrew
the trvo nuts
holding
the oscillator
coil
ancl
shield
close
to the
cl-rassis,
r.enlove
coil
ar.rcl
shield
about
1 iuch
f ronr
chassis.
ZEN|TH,fBl3l
Oscillator
dead..
. Remove
oscil-
lator
coil,
place
eighth inch
composition
spacing
washers
over mounting
lugs
and
reassemble.
ZENITH
48I3I
Dead
from
550 to 700 kc
check
for
open
9,000
ohm
j
watt
resistor
in cathode
of 15
tube.
zENtTH
.1823
|
Vibrator
hash
on
all
but
local
sta-
tions
. replace
.5 mfd
400 volt paper
condenser
across
input
filter
condenser
(Cll
in
diagram).
WUNLITZER
63