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-
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