GENERAL RADIO COMPANY 1269·A User manual
OPERATING INSTRUCTIONS
TYPE
1269·A
POWER
SUPPLY
Figure 1.
Type
1269-A
Power
Supply.
..
:.
.
TYPE
1269-A
POWER SUPPlY
PURPOSE.
The
Type
1269-A
Power
Supply
(Figure
1)
is
a
general-purpose
source
of
plate
and
heater
power
for
laboratory
equipment
and
in
parti-
cular
for
the
General
Radio
Types
1208-C, 1209-C,
1209-CL,
1211-C;
1215-C,
and
1361-A
Oscillators,
to
which
it
attaches
directly.
Connec-
tion
to
other
instruments
requiring
about
300
volts
de,
at
50
rna
maximum
and
6.3
volts
ac
at
3
amperes
maximum
can
be
made
by
means
of
a
mating
connector
supplied
2 DESCRIPTION.
The
Type
1269-A
Power
Supply
is
housed
in
a
convertible-
bench
cabinet.
On
the
front
panel
are
the
on-off
switch
and
the
indi-
cator
light.
The
output
connector
is
on
the
right-hand
side,
the
input
power
cord
on
the
left-hand
side.
3 OPERATING CHARACTERISTICS.
The
Type
1269-A
Power
Supply
provides
about
300
volts
de
at
a maximum
load
of
50
milliamperes.
With
no
load
the
output
is
about
405
volts
de.
A
6.3-volt
3-ampere
ac
heater
supply
is
also
provided.
If
the
ac
load
is
limited
to
1.5
amperes,
as
much
~s
65
milliamperes
can
be
drawn
from
the
300-volt
supply
(at
about
285
volts).
Ripple
is
less
than
80
millivolts
ac
at
full
load.
Both
the
6.3-volt
ac
and
the
300-volt
de
supplies
are
isolated
from ground
and
from
each
other
to
permit
greater
latitude
in
external
connections.
4 INSTALLATION.
4.1
ELECTRICAL
CONNECTIONS.
Connect
the
Type
1269-A
to
an
ac
line
of
115 or 230
volts
(as
indicated
on
the
left-hand
side
near
the
power
cord),
50
to
'
60
cps.
The
power
supply
will
operate
rf
Unit
Os-
cillators
satisfactorily
from a
400-cycle
line,
as
well.
To
give
greater
latitude
in
external
connections,
both
the
6.3-volt
and
300-volt
supplies
are
isolated
from ground.
4.2
BENCH
MOUNTING.
The
Type
1269-A
Power
Supply
can
be
rig-
idly
attached
to
a
Type
1208-C,
1209-C,
1209-CL,
1211-C,or
1215-Cby
means
of
the
narrow
adaptor
plate
and
associated
screws
supplied
with
the
_
power
supply
and
the
clip
attached
to
the
oscillator
L
bracket.
2
To
attach
the
units,
proceed
as
follows:
a.
Temporarily
remove
the
upper
and
lower
right-hand
corner
panel
screws
from
the
front
panel
of
the
power
supply.
Use
these
screws
to
attach
the
adaptor
plate
to
the
power
supply,
with
the
left-
hand
long
end
of
the
adaptor
plate
placed
over
the
right-hand
end
of
the
front
panel.
b. Remove
the
front
and
rear
left
feet
from
the
oscillator.
Using
one
of
the
screws
removed,
attach
the
clip
to
the
oscillator
L
bracket
in
the
left
rear
foot mounting
location.
Note
that
this
hole
in
this
lo-
cation
is
tapped
10-
32
to
receive
the
mounting
screw.
Do
not
replace
the
feet.
c.
Attach
the
oscillator
to
the
power
supply
by
fastening
the
upper
and
lower
right-hand
corners
of
the
adaptor
plate
to
the
cor-
responding
tapped
holes
in
the
upper
and
lower
left-hand
corners
of
the
oscillator
panel.
Attach
the
clip
at
the
left-hand
rear
of
the
oscillator
to
the
matching
hole
in
the
righ~-hand
side
panel
of
the
power
supply.
The
necessary
screws
and
nut
are
supplied
with
the
power
supply.
The
Type
1269-A
Power
Supply
can
also
be
rigidly
attached
to
the
left-hand
side
of a
Type
1361-A
Oscillator.
The
power
cables
are
coiled
between
the
cabinets
and
the
end
frames
.
To
attach
the
units
proceed
as
follows:
1.
Remove
the
dust
covers
from
both
instruments
by
unscrewing
the
two
thumbscrews
at
the
rear
of
each
cover
and
removing
the
covers.
2. Remove
the
rubber
feet
from
the
right-hand
side
of
the
power
supply
and
from
the
left-hand
side
of
the
oscillator.
3.
Coil
the
power
cables
and
plug
them
in
as
required.
4.
Slip
the
long
10-32
screws
supplied
with
the
power
supply
through
the
matching
holes
near
the
rear
on
the
side
plates
of
the
in-
struments,
starting
them
through
the
oscillator
side
and
engaging
the
nuts
on
the
power-supply
side.
5.
Secure
the
front
panels
of
the
oscillator
and
power
supply
by
means
of
the
small
adaptor
plate
supplied
with
the
power
supply.
The
screws
that
secure
the
power-supply
panel
to
its
right-hand
end
frame,
and
the
oscillator
panel
to
its
left-hand
end
frame,
are
temporarily
re-
moved
while
the
adaptor
plate
is
put
in
place,
and
then
the
screws
are
reinstalled.
4.3
RELAY-RACK
MOUNTING.
To
rack-mount
the
Type
1269-A
Power
Supply
attached
to
one
of
the
oscillators
mentioned
above,
a
Type
480-P412
Adaptor
Plate
Set
is
required.
After
attaching
the
power
supply
to
the
left-hand
side
of
the
oscillator
as
described
in
paragraph
4.2,
install
one
adaptor
plate
on
the
left-hand
side
of
the
combined
unit,
and
the
other
on
the
right-hand
side.
The
screws
required
are
supplied
with
the
Adaptor
Plate
Set.
4.4
ELECTRICAL
CONNECTIONS.
Electrical
connection
to
one
of
the
General
Radio
oscillators
listed
in
paragraph
1
is
included
in
the
3
instructions
of
paragraph
4.2.
For
connection
to
other
instruments,
use
the
four-prong
connector
supplied.
5 OPERATION.
The
on-off
panel
switch
is
the
only
control.
To
turn
power
on,
place
this
switch
in
the
upper
position.
The
indicator
lamp
should
light
when
power
is
turned
on.
6
SERVICE
AND
MAINTENANCE.
6.1
WARRANTY.
We
warrant
that
each
new
instrument
sold
by
us
is
free
from
defects
in
material
and
workmanship,
and
that,
properly
used,
it
will
perform in
full
accordance
with
applicable
specifications
for a
period
of
two
years
after
original
shipment.
Any
instrument
or compo-
nent-
that
is
found
within
the
two-year
period
not
to
meet
these
stan-
dards
after
examination
by our
factory,
district
office,
or
authorized
repair
agency
personnel,
will
be
repaired,
or,
at
our
option,
replaced
without
charge,
except
for
tubes
or
batteries
that
have
given
normal
serv1ce.
6.2
SERVICE.
The
two-year
warranty
stated
above
attests
the
quality
of
materials
and
workmanship
in
our
products.
When
difficulties
do
occur,
our
service
engineers
will
assist
in
any
way
possible.
If
the
difficulty
cannot
be
eliminated,
please
write
or
phone
our
Service
De-
partment
(see
rear
cover),
giving
full
information
of
the
trouble
and of
the
trouble
and
of
steps
taken
to
remedy
it.
Be
sure
to
mention
the
serial
and
type
numbers
of
the
instrument.
Before
returning
an
instrument
to
General
Radio
for
service,
please
write
to
our
Service
Department
or
nearest
district
office,
re-
questing
a
Returned
Material
Tag.
Use
of
this
tag
will
ensure
proper
handling
and
identification.
For
instruments
not
covered
by
the
war-
ranty,
a
purchase
order
should
be
forwarded
to
avoid
unnecessary
delay.
6.3
REMOVAL
OF
DUST
COVER.
To
remove
the
cover,
loosen
the
two
fluted
locking
screws
on
the
back
of
the
instrument.
These
will
unlock
on
the
first
turn,
but
should
be
loosened
the
maximum amount
before
the
cover
is
removed.
Pull
the
cover
off
the
instrument.
When
replacing
the
cover,
be
sure
that
it
engages
in
the
slots
on
the
back
of
the
panel
before
you
tighten
the
locking
screws.
6.4
FUSE
REPLACEMENT.
The
Type
1269-A
Power
Supply
uses
two
Slo-Blo
line
fuses,
accessible
for
replacement
when
the
dust
cover
is
removed.
Sizes
are
0.6
ampere
for
115-volt
input,
0.3
ampere
for
230-volt
lines.
4
1
6.5
CONVERSION
TO
DIFFERENT
LINE
VOLT
AGE.
The
power
supply
can
easily
be
converted
from
115-volt
to
230-volt
input
or
vice
versa
by
reconnection
of
the
power-transformer
primary,
as
shown
in
Figure
2. When
making
this
change,
always
insert
proper-sized
fuses.
Appro-
priate
measures
should
be
taken
so
that
the
legend
indicates
the
new
input
voltage.
On
instruments
changed
from 230
to
115
volts,
this
sim-
ply
means
removal
of
the
230-
nameplate;
a
115-
v
legend
is
marked
beneath.
For
instruments
changed
to
230
volts,
a
nameplate
(Type
5590
-1664)
may
be
ordered
from
General
Radio.
SPECIFICATIONS \
"\.
,.--
Output
(at
115- or
230-volt
input): 300
volts
de
(±5%)at 50
ma,6.3
volts
ac
at
3
amperes
(with
ac
load
at
1.5
amperes
·or
less,
maximum
de
load
is
65 rna,
about
285
volts
de).
Regulation: At
no
load,
de
output
is
380
volts.
Ripple:
Less
than
80
mv
rms
(120
cps)
at
full
load.
Input: 105
to
12~
(or 210
to
250)
volts,
50
tp
60
cps, 50
watts
full
load
at
115 (or 230)
volts.
Can
also
be
operated
from a 110-
to
125-v,
400-cycle
supply
for
applications
where
a
400-cycle,
6.3-v
output
can
be
tolerated.
Connectors:
Line
cord
permanently
attached
to
instrument.
Standard
4-terminal
receptacle
mounted
on
cabinet
side
for
convenient
connec-
tion
to
rf
Unit
oscillators.
Accessories Supplied: Mating
plug
for
the
4-terminal
receptacle.
Cabinet:
Convertible-
bench.
Dimensions: Width 4
1/4,
height
7 5/ 8,
depth
9
1/4
inches
(110 by
195
by
235
mm)
over-all,
not
including
power
cord
.
Net
Weight: 5 3/ 4
pounds
(2.7 kg).
FOR
115V
OPERAriON CONNECT:
I
TO
3 AND
2T04
F5
01 8
F5
02
" 0 .6
AMP
SLO-BLO
FOR
230V
OPERATION
CONNECT
·
2
TO
3
FSOI 8
F502;
0.3
AMP SLO-
BLO
Figure 2.
Schematic
Diagram.
5
REF
NO.
R501
R502
R503
C501A
C501B
F501
F502
P501
PL501
S501
S0501
T501
V501
PARTS
LIST
DESCRIPTION
RESISTOR,
Composition
270Q ±10%
RESISTOR,
Composition
120KQ
±10%
RESISTOR,
Wire-wound
6.8Q ±10%
.
751Jf
450dcwv
CAPACITOR,
Electrolytic
Block 75flf 450dcwv
FUSE 115v:
0.6amp
230v:
0.3amp
FUSE 115v:
0.6amp
23Dv:
0.3amp
PILOT
LAMP
POWER CABLE
SWITCH
SOCKET
TRANSFORMER
TUBE, Type 6X4
PART
NU!viBER
6120-1279
6120-4129
Part
of
7510-1930
4460-1900
5330-1100
5330-0800
5330-1100
5330-0800
5600-0700
4200-1800
7910-1300
4230-0700
1269-2000
8360-8100
GENERAL
RADIO
COMPANY
*WEST
CONCORD,
MASSACHUSETTS
*NEW
YORK:
Broad
Avenue
at
Linden
*WASHINGTON
:
Rockville
Pike
at
Wall
lon
.-
Ridgefleld,
New
Jersey
Rockville,
Mary
l
and
SYRACUSE:
Pickard
Building
,
East
Molloy
Road
ClEVELAND:
5579
Pearl
Road
Syracuse
11
,
New
York
Cleveland
29,
Ohio
PHILADELPHIA:
1150
York Road
*CHICAGO:
6605
West North Avenue
Abington
,
Pennsylvan
ia
Oak
Pork, Illi nois
FlORIDA: 113 East
Colonial
Drive
Orlando
,
Florida
DAllAS
: 2501-A
West
Mockingbird
lone
Dal l
as
35
,
Texas
*LOS ANGELES:
1000
North
Seward
Street
los
Angeles
38,
California
SAN FRANCISCO:
1186
los
Altos
Avenue
Los
Altos,
California
*TORONTO:
99
Floral
Parkway
Torontoi
.5r
Ontario
MONTREAl: Office
395
1255
Laird
Boulevard
Town
of
Mount Royal,
Quebec
,
Canada
*R•polr
servi"teS
ore
~voi,.ble
01
these
offices.
--
,.;:;:)
GENERAL
RADIO
CQMii~NY
IOvers~lil,
Zurich, Switzerland
Representatives
~5(1\jipal
Overseas
Countries
Printed
in
U.S.A.
6
This manual suits for next models
1
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