MODEL
HF-85
STEREOPHONIC
PREAMPLIFIER
general description
GENERAL
The EICO
Model HF-85 is
a complete high fidelity
ster-
eophonic control
center. It offers
proctlcallyevery
con-
trol and switching
facility
anyone could want
In a physi-
cal design adaptable
to
any type of installation.
With
it
you can select, preamplify
and
control accurately,
ony
stereophonic
source, whether
It
be
from tope,
discs
or
broadcasts.
Every control facility
Is
both useful and
ef-
fective.
Extremely
low distortion,
bordering
on
the
Immeasurable
(even
at high output levels),
precludes
any degradation
of quollty
from the best
modern program sources.
The HF-85 Is self-powered,
utilizing
a full-wove
rectifier
tube
power supply.
It works in
conjunction with
any
two
high quality
power amplifiers,
such as the EICO
HF-I4,
HF-22,
HF-30,
HF-35, HF-50,
and HF-60.
FEATURES
1.
Separate low level
input in each
chonnel for
mag.
phono, tope head,
and microphone.
Circuitry carefully
designed to provide
the high
gain required by tape
heads
and high
quality, low output
mag. cartridges
without hum
and
noise problems.
A
front
panel switch
permits choice
of the
proper NARTB tape
head equalization
for either
7
1/2
& 15 or
3
3/4
ips tape speeds.
2. Separate
high level inputs for
AM tuner, FM toner,
and FM Multiplex.
Also two auxiliary
A Inputs (one
in
each channel)
and two auxiliary
B Inputs
(one in eoch
channel).
Input selector switch
on front panel
has posi-
tions forfeedlng
FM tuner output
to one
channel and AM
tuner to the other,
or FM tuner to one channel
ond
FM
Multiplex
adapter output to the other.
3. Independent
level controls
that may be
operated sep-
arately
or together with
a built-in clutch.
4. Distortionless,
3-stage, independent
bass and treble
tone control
circuits
In each channel. Each
tone control
circuitcortsistsofa feedback
amplifier
palr(30db of feed-
back) driving
true
variable crossover,
feedback tone
cmtrol
stage.
Bass and treble
controls do not
Interact
with each other
or affect the
level. Bass controls
In both
channels and treble
controls
in both channels
are concen-
tric.
Controls
may
be
operated
indivIduoMy or together
with a built-in
clutch.
5.
Fletcher-Munson
loudness
compensation for
low
level
listening
which
may bedisobled
byfront
panel slide
switch.
6. Extremely
versotlle
function selector
permits
listening'
to
each channel
separatelyfor
cheeking
purposes; onstereo
listening,
to
reverse
the
channel connections;
on
mono-
phonic record
ploying
with a stereo
cartridge,
to mix the
,
twochonnelsforconcellotlonof
vertical
rumble;
on mon-"
ophonic
tuner, to have
the channels
unmlxed
so as not ta.
Introduce
extraneous
noise from the
unused input,
7. Low impedance
output to tape recorder,
useful
on all
inputs.
Output to
main amplifier
Impedance
permits
use
of
up
to
40ft. of
25mmfd/ft.
shielded audio
coble before
response
at
20,000 c is affected.
8. Hum bolance
control,
pilot lamp,
convenience
out-
lets.
9.
New "low-silhouette"
construction
matches EICO
tuner.
Very attractive
when
placed on
a
shelf
or out
in
the
open, yet
permits easy
console Installation
with full
shielding and
adaptability to
any panel
thickness.
Em-
ploys one piece
horizontol
chassis (cadmium
plated steel)
attached
to the
centersof two
side pieces
(brown enameled
steel). Unit Is
self-supporting
for easy
servicing top
or
bottom.
Perforated
steel
cover (metallic-gold
painted)
slides In and
out
on
rails
in
the
side pieces.
A bottom
plate and front bezel
(both brown
enameled
steel) plus
a
solid
brushed brass
control
plate complete the
assembly.
Controls may be
used
as
either
concentric
or
ganged with
built-in clutch
mechanisms.
1
To Next Page
Loading...
