Technical information

O
RADIO
RETAI
tI
N
G'i_J7,
EMERSON
MAC-7
.
Dead
.
. .
look
for
open
2000
ohm
1-rvatt
cathode
resistor
on
5g.
SYPBSOII.
M-AC-7.
r{unr,
after
Derlg
n
s-crvice
several
rrrorrths,
""4;;;
to
opel
filter
or
other
conrnron
causes
.
- .
Check
iigh
voltage
*i.airg
".i
porter
.
transformer
wittr
an
ohlunleter.
.t
nc
wtndt,)g
sonretinres
partially
shorts,
lllt',r11.jpg
the
center_tap
om.
!$ensoN
zoA,
zs!..
.Excessive
os-
curatlon
....
Remove
antenna
wire
coil
rrom.
Instde
case.
Even
a snrall
amount
wrtnrn
chassis
causes
trouble.
EMERSON
26.
Complete
or
partiallv
distorted..output,
intermittent
dT;torii;;
or_wh.istting
. .
.
Defective
t5,0dg;h;:
1rw.1tt
resistor.
dropping
screen
voltage
or
J/
second
detector.
Replace
;ith-i
watt
unit.
(I.F.
456
kc.)
EMERSON
26
Overloading
on
strong
signals
second
detector
plate
resiJtor
"h".
*r."ilrl
rncreased
value:
replace
with
'lower
value.
:l{El:oN _39
Aw,
33
Aw,
2so
Aw,
3Zt
AW,
350
AW
.
Motorl.roating,
interrnittent
Re-
pllrce.()l
mfd.
coupling
condenser
on
grrrl
o[
43.
Also
change
d
rneg.
grid
resistor
to
100,000
ohrus.
EMERSON
32
_
Hunr,
no
reception
operi
in
con-
denser
block
l_reneath
chassis.
ir.rrril,,r
8
trrfd
contlenser
across
ter.nrinals.
EMERSON
36
.
No
screen
voltage
shorted
or
leaky
.02
mfd.
screen
bypass.
Oit""
this
causes
the
9000
ohm
section
ol
ihe
voltage
divider
to
burn.
If
damaged
replace
divider
with
9000
of,rn
j
*1tt
and
27,000
ohm
1
warr.
EMERSON
?8,
42,
49
.
N^o_
reception
check
for
open
in
0.01
_
mfd.
tubula,
.ond.nr"r,
.irr-
nected
betrveen
grid
of
75
tubl
and
.tou'
end
of
i.f.
rvinding
febding
diode
plates
oi
same
tube.
Dead
. . .
heat
gcner.ated
in
filanrent
lorrage-dropping
resistor
frequently
causes_
loose
connections
.,f
te.lninal,
of.
unit.
Wind
leacls
securelr,
";-1;;:
nrinals.
resolder.
EMERSON
IO7-W
.-Distoltion
checkresistancefrorn
.13
grid-
to grouncl,
should
lrc
"p;;o*i
rrrateir'
I
ureg.
Lol,er
reatling
iriciicate.
breakrlou'rr
in
C22,
a .l
nrfcl
l.o,rdeu..,-.
EMERSON
II6
,
Dead
on
portiorr
of
thc
broadeast
ba.nd.
. .
.
This
is
caused
by
the
6D6
mixer
oscillator
plopping
ouiof
oscilla_
tron.
Replace
6D6
rvith
a 6C6.
EMERSON
XII6,
KI2I,
KI23
Inability
to
rotate
tuning
FADA
sers
with
panel
control
chassis
from
cabinet:
if
condition,
slip
spring
off
with
pair
of
.plicrs,
berrcl
rvhen
replaced
it
rrushes
firmly
against
beli.
EMERSON
AX
2il,
2t2,
2t7,
.
, renlove
bclt
in good
bracket;
and,
spring
so
that
pulley
more
contlen-
Check
FADA
25
Weak
tcst
nected
across
thc
of
tbe
27
detector.
nrfrl
unit.
FADA
25-Z
the
bypasses
con-
plate
and
cathode
Replace
with
.001
Inte_rnrittent
noise
which
continues
rcgarrlless
of
volunte
control
setting
.
calgfglly
resolder
control
gricl
cap
on
6QZGT
tube.
Grid
leaci'oi
tube
rt:rking
poor
contact
with
cap
r
rl
tuDe-
Y.1\,
poor
tone
replace
.25
mfd.
400
volt
condenser
froni
;;r;j
to
green
resistor
at
center
bot6m
of
chassis
with
8
mfd.
electrolyf.
"";t.-^
FADA
25.2
Dial
slips
check
clearance
be_
trveen
dial
drum
and
volume
control.
FADA
2S.Z
_
Volume
control
inoperative
Green
20,000
ohm
resiitor
g-unding.
FADA
66.
.
Oscillation
on
one
of
more
shortwave
bands
...
Connect
300
ohm,,;i";;:
tive-
resistor
in
series
with'the
"""t.of
grid
lead
to
the
24A
fi.rt
d.i;;;:
oscillator.
FADA
RK
IOO
fnterference
check
leads
from
power
unit
to
receiver.
They
are in
a
metal
shield
which
should
l.
grornJ.J
to
car
frame.
FADA-
RA.
'Weak
reception.
vott_
ages
ok.
. .
. T.y
another
S,3
oscltfat"i-
no
.matter
how
high
the
old
one
tests.
N-otsy
volume
control
.
.
Try
a
new
56 in
the
first
a.f.
socket
befori
;nil:
ing
control.
Continuous,,static;-.1.
Cut
out
primary
of
purf,-prJi'-t.an._
rormer
and
couple
with
25,000
or
50.000
onm
resrstor
and
.01
condenser
fiom
plate
of
56
to
grid
of aZ.
-ii'cu.r".i..
lrkes
a
nrce
rain_barrel
tone
use
.l
mfd.
F+P4
Some
of
the
older
models
use
special
knobs
equipped
*itt
t.n.;on
srrr;,isi
wnrch
ht
rn
a
notch
cut
into
the-shait_
To
.
hold
these
in
place
while
,.pf"linn
KnoDs
hrst put
a little
soft
pitch
or-candli
tallow
in
the
notch.
IAPe.
Slipping,
diat
on
early
modets
navrng
separate
driving
drum.
Loosen
setscrews
and give
drum
half_turn.
ffris
Drlngs.
unused
portion
into
play.
If
orum
ts
worn
all
around
removi
and
file
a9yn..on
one
e_nd
of
bushing.
This
oer_
mrrs
rt
to
slrp
larther
into
drive
unitind
cures
trouble.
IA?A.
Stipping
diats
are
the
pet
ueah_
ylss
!
some
of
the
older
models.'
Remoztc
r,ne
dru-m
lrom
the
condetser
shaft
ond
lap
;t
fat
on ;ts
uidc
side.
Fit"
a;;";'I
oy
an..tnch
of
metol
of
the
flat
side
ol
tii
dial
"neck"
zohich
n|rmatti
-r"lir"
"l";"it
tne
spacng
coUar.
Wher_replacing
ii
push
it.
fgrd.
against
the
spacins
cottir
Uiii)
,tg
nt
enrng
-
t he
-
set
_screzas.
This
causes'
the
,^1!_r..-11
:?, !i"!
to.
b.e
fi.rmty
uedscd
in
oetzaeen
th.
plates
of
the
diue
esserrrbly.
221
EMERSON
AX2II
Interntittent
or
rveak
anterrna
coil
1l;rrge
hl;rck
coil
at
rear
ot.
clras:rs).
Gr.ourrrl
enri oI
coil
is
soldcr.ed.
.to
a Iarge
Iug
wh;ct'l
i;
in
turn
soldcred
to
chassis.
This
learl
breaks
ancl
nrakes
only
pa.tiaf
.oni"Ji.
EMERSON
,r09,
.il0,
{il (cHASSts
A_1)
_^I91k,
distorted
defective
5001000
ohm
resistor,
connected
to
flL l€nrod:
pIate,
ofien
i..p"".rIr..
r
ry
nerv
unrt.
EMERSON
JS
.
Weak
or
dead
0.06
mfd.
con-
denser,
connected
between
7
ptate
.na
1._m
of
tone
control,
likely^
shoried.
Also
check
tone
control
f;,
,1ar;ra-Je
occasioned
by
condenscr
br"akdorr.ri.'-
. .:\
otes
. .
.
manual
schematics
of
this
model
show
resisto,
R2tj-;o;
nected
to
high
voltage
center
tao
of
power
transformer.
There
should
be
no
connection,
however,
and
the
short
line
j.oining
them
should
be
d.let.J.
ror
allg'nrng.
instructions,
refer
to
In_
ternational
Radio
Corp.,
model
JS.
PYElqoN
T,
TS.
-
-
rrnprop.r-
a._
tector
24
plate-and
47 p.ale
current
.
Keprace.
.
cotrpling
condenser,
grid
to
plate,
with
.01.
-
Noisy
tuning
.
.-,
Bend
up,co.ntact
springs
on
rotor
or
attach
prgtatl
to
._chassis,
not
to
ena pt"t.s.
f
arlure
of
_'fS
to
oscillate
on
shortwaves
.
. ..Attach
lead
to
grid
of
24
";;'b;;
ln ptace
near
or
around
coil
mounted
on
b.ack
of
24
shield.
ea;uJ
uiiii'"..''iri"'l
tlon
occurs
uniformly
across
diat.
ERI;\
.ERLA,
BRANDES.
Cuttine
out
otten.
caused
by
defectir.e
local_rlistance
swrtch.
Lontact
nraterial
becomes
loose
ln
sprtng.
put
contact
irr
tapered
hole
a.nd.
centerpunch
around
.ag.
t"
1"_
ttghten.
ESPEY
ESPEY
MYSTIC
RECORD
PLAYER
.
lliclophonic
oscillation
shift
the.
oscillator
to
about
900
kc.
Thi;
;tction
t.ightens
the.parkler.
arrrl
renrove:
pixte
YtDl'atron.
-
2l