Specifications - Eico HF-12 Instruction Manual

MODEL
HF
12
72
WATT
INTEGRATED
HIGH
FIDELITY
AMPLIFIER
general description
GENERAL
The
HF12
is
a
true
high
fidelity
12-watt
integrated ampli-
fier
absolutely free of the
,, gimmicks ,
'
sometimes used
in
low-priced amplifiers.
It
provides
complete
"front
end"
facilities
and
true high fidelity
performance of such ex-
cellence that
we
can
recommend
it
unreservedly
for
any
medium -power
high fidelity
application.
Two HF
12*s
may
be used
for stereo
tape reproduction, each amplifier
connecting directly
to
a tape
head with no
other electronic
equipment
required.
FEATURES
1
Two
low
level inputs for
magnetic phono (RIAA) and
tape head (NARTB). Low
noise dual triode preamplifier
with accurate, low
distortion
equalization
for either input.
2.
Two
high level inputs for tv, tuner,
and
crystal or
ceramic cartridge.
3.
Unused
inputs are shorted at
every
position of the in-
put selector switch
for
zero
cross-talk.
4.
DC
superimposed on
all
tube filaments
to
eliminate
cathode-heater leakage
as
a source of hum.
5.
Low-noise
dual triode used exclusively
for
separate
bass
and
treble
tone
controls.
Extremely low
distortion,
variable crossover,
feedback-type
circuit.
6.
Highly
stable
Williamson-type power
amplifier circuit.
7.
Newly-designed
"flat" construction, utilizing
horizon-
tal
chassis
to
permit proper layout and component separa-
tion
necessary
for
long
component
life.
Extremely
flexible
design permits easy console installation with
complete
shielding
and
adaptability
to
any
panel thickness.
SPECIFICATIONS
Output Power:
12
watts continuous, 25
watts
peak.
*
1M
Distortion (60
&
6000
cps at
4:1)
:
1.3%atl2W;
0.55%
at
6W;
0.3%at4W.
*
Frequency Response:
1
W
:
±0.5
db 12 cps
—
75
kc; 12
W
:
±0.5db
25
cps
—
20
kc.
*
Harmonic
Distortion
:
20
cps:
2%
at
4.2
W; 1/2%
at
2.5W;
30
cps
:
2%
at
1 1
W; 1/2%
at
6.3
W;
40
cps
:
1%
at
12W;
1/2%
at
9.3
W;
2000
cps
:
1/2%
at
12W;
IQkc
:
1%
at
10W; 1/2%
at
6W.
*
Transient Response: excellent square
wave
reproduction
(4
usee risetime); negligible ringing, rapid settling
on lOkc.
square
wave.
* Transient Distortion (60
cps tone
burst)
:
less
than
1%
at
full
power.
1
COPYRIGHT*© 1960 ELECTRONIC INSTRUMENT
COMPANY,
Inc