Heathkit RA-1 - Specific Problems; Heater Power Problems; No Audio Output Troubleshooting; No Signal Reception Troubleshooting

Heaters do not light —
Heaters light, but ne sound
with GAIN controls fully
clockwise
|
Audio present - no signals
can be heard
|
|
|
|
|
|
|
1. Gheck fuse,
2, Check heater wiring,
3. Opencircuitvalveheater - Check continuity with an ohm-
meter.
4.
Check
power
transformer
wiring
against
Pictorial
3.
‘ating relays if used) are
fitted
to
octal
socket,
check
muting
circuit,
2. Gheck wiring of the GAIN controls
7
a
CAUTION:
When
making
the
following
checks,
do
not
touch
the
chassis
with
your
other
hand.
Be
sure
that
the
chassis
is
not
connected
to
an
earthing
point
and
that
you
touch
only
the
specified
pin
on
the
valveholder.
3.
Turn
the
Receiver
on
and
place
the
tip
of
a
small
screw-
driver
on
pin
8
of
V6,
then
touch
your
finger
to
the
metal
portion
of
the
screwdriver;
a
low
pitched
hum
should
be
audible.
4,
Now
place
the
screwdriver
on
pin
!
of
V6.
Again
touch
your
fingerto
the
metal
portion,
this
time
the
hum
should
be
louder.
Ifno
hum
is
present
check
valve
voltages
against
chart
Again
when
making
the
following
tests
do
not
touch
the
chassis
with
your
hand,
Check NL control is in MIN position,
1.
Placeasmall
screwdriver
onpin?
of
V5.
Touch
the
metal
portion
of
the
screwdriver,
a
low
pitched
hum
should
be
heard.
If
no
hum
is
present
check
valve
voltages
against
chart
and
check
components
around
V5.
2,
Similarly
make
the
screwdriver
test
on
pin
2
of
V4.
A
loud
click
should
be
heard.
3.
Similarly
repeat
the
screwdriver
test
on
pin
2
of
V3.
A
loud
click
should
be
heard.
4,
Similarly
repeat
the
screwdriver
test
on
pin
2
of
V2.
A
loud
click
should
be
heard,
5,
Similarly
repeat
the
screwdriver
test
on
pin
2
of
V1,
A
loud
click
should
be
heard.
If
no
hum
or
click
is
heard
or
if
the
hum
level
does
not
increase
check
valve
voltages
against
the
chart
and
check
components
around
valveholder.
|
and
check
the
components
of
valve
V6
and
wiring
to
speaker.
|
te
GLO
WC
EST
ER
eee
ee
Y
DAYSTROM
§
pe
ENGLAND
-
fe
| “SSE OS OO Pe PT oe
eed ates