Philco 700 - User Manual

.r@.,
PHILCO
TRANSITONE
SERVICE
BROADCAST
MAY, 1934
MODEL 7OO RECBIVER
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latest Philco
development
in single-unit
automobile
radio is
the
new Model
700. This
Receiver
is compact,
I
easier to install than ever before and will
give
exceptional
performance.
It
is a six-tube super-heterodyne with a
genuine
full-size Philco
electro-dynamic speaker-the same type that is
used in many of the larger home radio Receivers.
It has remarkable sensitivity, a three-section tuning condenser,
giv-
ing
improved selectivity-wonderful
tone, with a
three-point tone control, and
inherently
quiet
circuits. Interference
filters in the
"A"
lead
and
in the
pilot
light
lead
greatly
simplify
motor
interference
suppression. In most installa-
tions standard suppression is
sufficient.
Added to this, the ease of installation characteristic of
this
model
(only
one unit to install-one lead
to the
an-
tenna,
one
lead to the
ammeter)
and the convenient, attractive
airplane
type steering column
control, which makes
this
model universal in its
application, are additional
features of the
Model
700
which appeal to
both
the
dealer and the
public.
I. F.
TRANSFORMER
AND PADDERS
The new
style
I.
F. transformer
complete with
padders
is
used in the Model
700.
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 Ieads
instead
of ter-
minals
or
lugs. The
color scheme
of the leads is
given
in
Fig.
l.
If replacements
are ever necessary,
replace
the entire
coil assembly 32-1329
for
the
first
I. F.
stage
and32-1237
for
the second I. F. stage.
Neither
the coil
nor
the
pad-
ders will be
furnished
separately.
Order
only
by the
above numbers.
PRIiARYPAOOER SE@NORPADOR
SCN€W
ADJUTNEfr
TUT AN!5IN$T
1st I.
F.
Transformer
2nd
I.
F.
TransJormer
32-1329
32-1237
Fro. 1
MODEL 7OO 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
atternpt
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
gcod
condiiion except for the
padding
adjustments.
'
-,
Remove
the speaker
lid from
the Receiver. Remove
""he
grid
cap terminal
from
the
77
tube
(for
location
see
Fig. 2).
Set up the signai
generator
and adjust
it to exactly
260
K.
C. Connect the
generator
lead
to
the
grid
cap
of
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
6
are adjusted
first
(Figs.
2
and
3).
Turn theadjusting
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 max!
mum reading
on
the output meter.
Then adjust the
screw
6
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.
Repeat tle
above
procedure
with the condensers
@
and
@.
After
padding
the
first I. F.
stage, remove the
gen-
erator lead
from
the 77
tube
and
reconnect the
grid
lead
fa
the77
tube.
Set the
generator
to 1600 K.
C. and then
connect the
generator
lead to the
antenna
lead.
fhere
are
four
holes
in line,
one
in
each
of the sections
!
--
!-__

Philco 700 Specifications