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operation
PRELIMINARY:
Be
sure
all
tubes are firmly
seated
in
their
sockets
and
that
the
VI
tube
shield
is
making good
contact
with
its
base.
As
initial
adjustments,
set
these controls
as follows:
VOLUME
at
zero,
BASS
at
zero. Turn the
am-
plifier
on by
turning the
TREBLE
control
clockwise from
OFF
and
set
It
at zero
Initially.
Note
that the
VOLUME,
BASS, and TREBLE
controls
all
affect the
TAPE
OUTPUT.
LISTENING
TO PHONOGRAPH:
Set the
SELECTOR
to
PHONO
if
you have
a
magnetic
cartridge or
AUXillary
if
you have a ceramic
or
crystal
cartridge.
The
RIAA
equa-
lization
provided
for
magnetic phono
cartridges
Is
now
the
standard
In
the recording Industry
and
is
also
a very
good
compromise
for
the
most important
of the older characteris-
tics.
The
better
ceramic
cartridges
are
also
self-equalizing
according
to
the
RIAA
characteristic.
Use
the separate
bass
and
treble
tone
controls
to
compensate
for
inexact
matching
of the actual recording
characteristic
as
well
as
the
over-all characteristics of
your audio system
(Including
room
acoustics).
LISTENING
TO
TAPE
DECK
(direct
connection
to
tape
head):
Set the
SELECTOR
to
TAPE
HEAD.
NARTB
tape
equalization
for
the
7
1/2
and
15 I.p.s. speeds
is
provided
by
the
preamplifier-equalizer
at
this
position. This
equali-
zation
Is
the industry standard
for
pre-recorded
stereo
and
monaural
tapes.
The
bass
and
treble
tone
controls
can be
used
to
compensate
for
inexact
matching
of the actual re-
cording characteristic.
LISTENING
TO
TUNER,
TV,
TAPE
RECORDER
HAVING
BUILT-IN
PLAYBACK
PREAMPLIFIER
-
EQUALIZER:
Set
the
SELECTOR
to
TUN
or
AUX
depending on
the Input
desired.
The corresponding
high
level
input
will
feed
through
the amplifier.
Adjustment
of the
level
control
on
each
source
is
discussed
in
the
"ELECTRICAL INSTALLA-
TION"
section
under "High Level
Inputs".
MAKING
RECORDINGS:
Tape
recordings
may
be
made
by connecting
the
recorder
to
the
TAPE
OUTPUT
jack.
See
"Tape Output"
under
"ELECTRICAL
INSTALLATION"
Please note
that
recordings
cannot be
made
on
tape decks
intended only
for
stereo or
monaural
tape
playback.
Re-
cordings
can only be
made
on
tape
machines having
record-
ing
facilities
including
the
necessary electronic
equipment,
which
may
be
either built-in or
supplied separately
by
the
tape
deck
manufacturer.
BASS
CONTROL:
The
plus sign
on
the right side of the
dial
indicates
that
clockwise
rotation
from the
mid-point
(0)
Increases
(boosts) bass
response; the
minus
sign
on
the
left
side
indicate
that
counter-clockwise
rotation
from
the
mid-point decreases
(cuts)
bass response.
There
is
no
in-
teraction
with
the
TREBLE
control.
Start
all
adjustments
with
this
control
set at
the
mid-point
(0),
which
is
called
the "flat" position
since
bass
repsonse
is
neither cut nor
boosted
at
this
setting.
TREBLE
CONTROL:
The
plus sign
on
the right side of the
dial
indicates that
clockwise
rotation
from the
mid-point
(0)
increases
(boosts) treble
response; the
minus
sign
on
the
left
side indicates that
counter-clockwise
rotation
from
the
mid-point decreases
(cuts)
treble response.
There
is
no
interaction
with
the
BASS
control.
Start
all
adjustments
with
this
control
set
at the
mid-point
(0),
which
is
called
the
"flat" position
since
treble
response
is
neither cut nor
boosted
at
this
position.
maintenance
TROUBLE
SHOOTING
&
OPERATING NOTES
Your
amplifier should require
little
service
except
for
nor-
mal tube replacement.
We
recommend
no
substitutions for
the
tube types used
in this
amplifier
except
as stated. All
the
tube
types
used are
distributed
nationally, but
replace-
ments
can be obtained
directly
from
EICO
If
desired.
To
facilitate
servicing, remedial
and
trouble-shooting pro-
cedures
have been
provided
in
the
TROUBLE-SHOOTING
CHART
that
follows.
A VOLTAGE
AND
RESISTANCE
CHART
is
also
provided
as
an
aid
In
locating defective
components.
DC
operating voltages are given both
at
no
signal
and
signal
developing
50
watts output,
as
well
as
the
corresponding
1
kc
signal
voltages.
TROUBLE-SHOOTING PROCEDURES
Connect
a
phonograph and
speaker
to
the amplifier
as
de-
scribed
in
"Electrical
Connections" and
set
controls
for
phono
listening.
Play a
known
high quality
LP recording
on
the
phonograph.
If
there
is
no output
to
the
speaker
or
if
the
output
Is
low
or
audibly
distorted,
procede
to
the
checks
for
those
symptoms.
If
there
is
excessive
hum
in
the output,
disconnect
the
phono
input
cable from
the
amplifier
and
short the
phono
input jack
to
chassis.
If
the
hum
disappears, the trouble
is
not
in
the amplifier but
in
the
phonograph
or
in
the
connection
to
the amplifier.
The cause
of
phonograph
hum
maybe
a metal
pick-up arm
not
grounded
to
the
cable
shield
(try
a
good
single
ground
5
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Table of Contents
Troubleshooting
