Philco 11 Service Manual

PHILCO
TRANSITONE
SERVICE BROADCAST
APRIL,
1934
MODEL
II
RECEIVrER
,T1 tu
Pnruco 4uto radio Model 11
is a
new Philco
development
in
single-unit automobile
radio.
It
is
compact,
I
easy
to install
and
will
give exceptional performance.
A
supelheterodyne,
using six
of
the latest tubes
designed
for
automobile
radio,
it
has
a
genuine Philco
electro-
dynamic speaker,
the
same
type that is
used
in
many
of the larger
home
radio Receivers.
A
three-sectipg
tuning
con-
denser
giving improved selectivity, remarkable sensitivity and tone, inherently quiet circuits and other
improvements
make
this
model one
of
the outstanding and most popular automobile
radios.
Added
to
this, the
ease
of installation
characteristic
of this model (only
one
unit to install,
one
lead to
the antenna
and one
lead
to
the ammeter) and the handy, attractive
steering-column control which
makes
this mqdel universal in
its
use
are
additional featu{es which make the Model
1l
a very
desirable one
for the
dealer and
for
the
owner.
I.
F.
TRANSFORMER
.A.ND PADDERS
The
new
style
I.
F. transformer
complete with
padders
is used
in
the
Model
11.
The padders are placed
in
the top
of
the
shield
can
one above
the
other.
The
primary
padder is
adjusted
by
means
of the
screw
slot,
accessible
through the hole
in
the top of the
shield
can.
The secondary padder is adjusted by
means
of
the
small hex
nut,
aiso accessible
through the
hole
in the top
of
the
shield.
(See
Figs.
1
and 2.)
The coil windings
terminate
in
leads instead
of
ter-
minals
or
lpgs.
The color
scheme
of
the
leads
is given
in
Fig.
l.
If
replacements
are ever necessary,
repJace
the
entire
coil assembly 32-1329
for
the
f,rst
I.
F.
stage and 32-1237
for the
second
I.
F. stage. Neither the coil nor
the pad-
ders
will
be furnished separately. Order only
by
the
above numbers.
crrre
'N1-1
-;--fqcn,o
t .l.k' J
*rrFaqrt'k/ d'b I
o3c.ao'r d.b
I
,,neo.
y'\--lS!!tpEalx
the
77
tube.
(See
Fig.
2.)
The output meter must
be
connected.
The
Receiver volume
control must be turned on
to
approximately
full
volume
and the attenuator
in
the
gen-
erator set for
a half-scale reading
of
the output
meter.
The padders @
and 6r are adjusted
first
(Figs. 2
and
3).
Turn
the
adlusting screw
@
all
the way
in.
A
metal
screwdriver
can
be used
for
this.
Then, with
generator
attenuator set so there
fs 4pproximately half-scale
read-
ing, adjust tf,e
nut
@
with a
fibre
wrench
for
the maxi-
mum
reading on the
output
meter.
Then adjust the
screw
6
for maximum
reSding on
the
meter. This
adjuslment
is critical. Note the
maximur-n
reading obtainable and then
turn the
screw
in
again
aqd
readjust,
just briqging
the adjustment
up
to the maxirnum
reading. Do nqt
pass
it
and then back
off.
Repeat the above procedure
with
the
condensers
@
and 6"
After
padding
the hrst
I.
F.
stage,
remove
the
gen-
erator lead
from the
77
tube and
reconnect
the
grid
lead
to
the
77
tube.
Set the generator
to
1500
K.
C.
and then
connect the
generator lead
to
the
antenna lead.
There are
four
holes
in
line,
one
in
each
of
the
sections
PRIXARY
PSEE
SE@ND8Y hODER
*RE*EJ$INEf
lst
I.
F.
Transformer
32=1329
oF'nmY
rup€t
2nd
I.
F.
Transformer
32-1237
Frc.
1
MODEL
11
ADJUSTMENTS
All
adjustments
have been carefully
checked
at
the
factory.
If,
however,
it
is
found
necessary
to
readjust
the padding
condens€rs, this procedure must be
followed
care{uliy. Do
not
attempt to make
any
adjustments
until
the procedure is clearly
understood or
without
the
use
of a
good oscillator or
signal generator
and output
meter, The Philco
Set
Tester
048 is
highly
recommended
for this
procedure
and
for all
service work.
The
Receiver must be
connected
to a
six-volt
storage
battery and turned on for operation.
It
is
assumed
that
tubes have been checked
and
that the
Receiver
is
in
good condition except
for
the padding
adjustments.
Remove
the
speaker
lid from the Receiver.
Remove
the
grid cap terminal from the
77
tube
(for
location
see
Fig. 2).
Set
up the
signal generator
and
adjust
it
to
exactly
260
K.
C.
Connect
the generator
lead
to the grid
cap
of