Philco 805 Service Manual

=-
PHILCO
TRANSITONE
SERVICE
B
ROADCAST
APRIL,
1935
MODEL
805 RECEIVER
HE
PHrLco Transitone Model 805
is
Prur,co's
newest
in
automobile
radio. ft is a highly
developed
super-
heterodyne single-unit
type
Receiver
with
all
the outstanding features required
in
such
a
fine
instrument.
The
Receiver,
speaker
and full-wave Pnrr,co Vibrator are
housed
in a
rugged, compact,
fully
shielded
container,
which
is
designed
for
quick and
easy
installation on the
dash
of all
automobiles. When installed
in
the
car, the loud
speaker faces
the front
seat,
so
that the
extremely
powerful Pnrr,co
electro-dynamic
speaker,
concealed
behind
an artistic grille,
delivers
its
full-toned reproduction toward
the
occupants
of the car
with
utmost fidelity.
All
tubes used
are the latest Pnrr-co high-efficiency tubes,
designed
especially
for
automobile
radio.
Prrrr-co's system
of
automatic volume
control used
in this
Receiver
not only
gives
that
smooth,
elastic
control
which
counteracts
fading while driving along and
prevents blasting
of local stations,
but
also
subdues the
harsh interference
usually present
between stations.
The new
Receiver
is ALL-ELECTRIC,
operating
entirely from the
car
battery system. The
full-wave
Prrrr.co
Vibrator is built
in
as an
integral part of
the
Receiver.
fnterference
filters to cut out the motor interference set
up by the car ignition
system
and specially
designed
shielding make
the
Receivers
especially
easy
to
install.
I. F. TRANSFORMER AND PADDERS
The
I.
F.
transformers
are
assernbled 'complete
with
pad-
ding
condensers.
The
padders
are placed
in
the
top of
the
shield ca,n,
one
above
the
other.
T,he
primary
padder
is
adjusted
by
mea.ns
of
the screw slot,
accessible
ttrrough
the
hole
in
the
top of
the shield ca"n. The
secondary
padder
is
adjusted
by
means
of
the
sm'a"Il
hex nut,
also
accessible thr:ough
the
hole
in
the
top of the
sihield.
(See
Figs.
I
and
2.)
The coil windings terminate
in
leads
instead
of
ternr,ina,ls
or
lugs.
The color
scheme
of
the leads
is
given
in Fig.
L
If
replacemenrts
are ever
necessary, replace
the
entire
coil
assernbly 32-1650
for
the
firsrt
I. F.
stage and 32-1651
for
the
second
I.
F.
stage. Neither
the coil
nor
the
P'adders
will
be
furnished
separ:ately.
Order only by the
above
numb,ers.
Fraunn I
MODEL
805
ADJUSTMENTS
All
adjustments have been
carefully
checked
a,t.
the
factory.
If,
however,
it
'is
found
necessary
to
readjust the padd,ing
con-
densers,
this
prtocedure
must be
followed carefuJly.
Do
not
atternprt
to rnake any adjustrnents unrtil the
prccedure is clearly
understood
or
wirbhout
the use
,of
a
good
os.oillator
or
sign,al
generator and
output meter. The
Prrrr.co
set
Tester
O48 is
highly
recommended
for this
procedure a.nd
for all
service
work.
The Receiver must be connected
to a
six-volt storage
ba,t-
tery and
se,t
up for
opera,tion.
It is
assumed
that
tubes
heuve
been checked
ancl
that
the
Receiver
is
in
good condition except
for
the padcling
adjustmenrts.
Remove
the cover frorn
titre
Receiver
and
disconnect
the
grid
clip
frorn
the
78
tube, L F.
srtage.
(For
location
see
Fig.
2)
Set
up
tlhe
signa,l
generator and adjust
it to
exactly
260
K.,C.
Oonnect
the
genera,tor
lead
to
the
grid
cap
of
ttrre
78
tube, and ground the
shield
to the
Receiver
hous'ing.
Connec,t
one
lead
frorn the output
rneter
to the
plate
of
the
rll
tube and
the
other Iead
to the
Receiver
housing. The
Re-
ceiver
volu,me
control
rnus,t
be
turned
to
approximately
full
volume, and
the
a,ttenua,tor
in
the generator
set
for
a.
hra,lf-scale
reading o,f
the outprut meter.
Frcunr
2
I',he
secondary
nut pitdder
@
must
be adjusted
for
maximum
reading
in
the output meter. Then
zrdjust the
primary
screw
padder
@ for ,maximum reading.
Remove
the
generralor
lead from the
?8
tube and
reconnect
the
grid
clip.
Disconnect
the
grid
clip from
the 6.{? tube,
a.nd
connect the
generator lend rto
tl-re
grid
cap
of
this
tu.be. The
secondary
nut
padder
@
rnust be adjusted
for
maximum reading
in
the
output meter. Then adjust the
primary
screw padder
@
for
rnaxirnum
reerding.
Readjust
perdders @
and
@
for
rnaximum reading on
rthe
output
meter,
After
padding
the
second
I.
F.
stage, re{nove
the
generator
lead
frrom trhe
6.4.7
tube and
reconnect
the
grid cl'ip.
Adjust
the
generator
to
1600 K.
C., and then
connect
the
p;enerator
Jead
to the
a.ntenna
lead, using
a
150 mmfd.
condenser in
series between
the tu'o
lezrds.
Grnound
the
shield
to
the
Re-
ceiver
housing.
Turn the Tuning
Oonclenser
Plates
fully ,out
of
mesh.