Eico ST 40 - General Description; Key Features

eicoETZTI
40
WATT INTEGRATED
STEREO
AMPLIFIER
GENERAL
DESCRIPTION
The E1CO Model
ST-40
is a
complete high fidelity
stereophonic control centeranda pair of 20-watt amp-
lifiers, all on one chassis*
With It,
you
can
select,
preamplify, and
control
any
stereophonic or monophic
source and feed it through
the
self-contained dual
20
watt amplifiers to a stereo pair of speaker systems.
Provision Is made for operating a center speakerdirect-
ly from the ST-40*
FEATURES
1.
Provision for two
stereo
phono
cartridges
to be
connected. Permits
the
use
of both
a turntable and
a
record changer in the installation. One pair presents
47KQ
load
and
the other pair
100KQ
load,
to
cover
most popular cartriges* RIAA equalization.
2. Provision for connecting
stereo tape heads*
NARTB
equalization
for
7
1/2 I
ps*
3.
High level input
pairs for multiplex adaptor,
pre-
amplified and equalized tape, FM
tuner,
and
AM
tuner,
4* Separate level
and
balance
controls* Null-type
balance
checking
circuit.
5.
Switched high and low frequency filter
circuits
permit
elimination
of rumble problem or
scratch and
distorrion
when
need be.
6.
Switched loudness compensation*
7.
Tape monitor switch*
8.
Feedback equalization,
with
feedback around
both
preamplifier stages.
High
overload point.
9*
Bass and treble tone controls are of the variable
inflection
point, feedback
type for
exceptionally
low
distortion and the most desirable control characteristics.
These controls do not
affect
the
volume
or interact
with
each other, and boost or cut at the extremes of the
audio
range do not affect the mid-range.
10. Separate filament
windings and
hum
balance
con-
trols
for each channel
permit an optimum hum
balance
for each channel, rather than a compromise for both
channels.
11. Unused inputs grounded
by SELECTOR switch to
eliminate cross-talk
—
except for
TAPE
inputs, since
some tape machines are adversely affected
if playback
outputs
are
grounded during recording.
12.
Provision
for
feeding a
center speaker directly
from the ST-40.
13. Conservatively
operated
7591 output tubes, and
highly
efficient
*GZ34 rectifier.
COPYRIGHT©
I960 ELECTRONIC
INSTRUMENT COMPANY, Inc.