Philco 11 Service Manual

PH
I
LCO
TRAN
S
ITON
E
SERVICE BROADCAST
NOVEMBER,
1934
MODEL
1r
(CODE
r22)
RECETVER
HE PHILCo
auto radio Model
ll
(Code 122)
is
a new
Philco
development
in
single-unit automobile
radio.
It
is
compact, easy
to
install and
will
give
exceptional performance.
A
superheterodyne,
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-section
tuning
con-
denser
giving improved selectivity, remarkable sensitivity and tone, inherently quiet circuits and other
imp'rovements
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 model universal in
its
use
are additional features which
make
the.Model
l1
a very
desirable one
for
the
dealer and
for the
owner.
I.
F.
TRANSFORMER
AND
PADDERS
The new style
I.
F. transformer
complete
with
padders
is
used
in the Model
1l
(Code
122).
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,
also
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
lugs. The color
scheme
of
the leads
is given in
Fig.
1.
If
replacements are ever
necessary,
replace the
entire
coil
assembly 32-1329
for
the
first 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.
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
@ are
adjusted
hrst (Figs.
2
and
3).
Turn the adjusting
screw @
all
the way
in. A
metal
screwdriver can be
used
for
this.
Then,
with
generator
attenuator set so there
is approximately half-scale
read-
ing, adjust the
nut
@
with a
fibre wrench
for the
maxi-
mum reading on the output
meter.
Then adjust the
screw @
for maximum
reading on the
meter. This
adjustment
is critical.
Note the maximum
reading obtainable and then
turn the
screw
in
again
and
readjust,
just bringing
the adjustment up
to the maximum
reading.
Do not
pass
it
and then
back off.
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PRIMARY
PAOOER
SECONDAry
PADDA
lst
I.
F. Transformer
32-1329
Frc.
1
*"**-r:.rt**"
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sftrHJ.#oa
2nd
I.
F. Transformer
32-1237
Repeat the above procedure
with
the
condensers
@
and 6.
After
padding the
I.
tr'.
stages,
remove the
genera-
tor
Iead
from the 77
tube ancl reconnect the
grid
lead
to the
77
tube.
Set
the generator
to
1600
K.
C. and then
connect the generator lead
to
the
antenna lead.
There are four
holes
in line,
one
in
each
of
the
sections
MODEL
11 (CODE 122)
ADJUSTMENTS
All
adjustments
have been carefully checked
at
the
factory.
If,
however,
it
is
found
necessary
to
readjust
the padding
condensers,
this procedure
must be followed
carefully. 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
ppttery 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
fronr, 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
I
sr
l.F.
r-