Instruction manual
general
description
GENERAL
The
EICO
HF-14 Is a 14
watt
high fidelity basic power
amplifier employing two EL84 output tubes In push-pull
and
a high
quality
output
transformer. The high power
sensitivity
of
these remarkably
fine
tubes eliminates
the
necessity for additional driver stages, permitting
the
use
of a large
cmountofinversefeedbackwlth
Q highstabiHty
margin. The
lower
operating
voltages
required and
the
use of
EZS1
rectifier
tube
having
(I
warm-up
characteris-
tic
exoctlymotched to
the
output
tubes, result in a power
supply of exceptional
reliabilityas
well as extended
out-
put tube life. Filter electrolytlc.s and the
rectifier
oper-
ate
well below
mQKlmum
ratings and
voltage
surges
at
starting are
eliminated.
The HF-l4 has been designed to maintain Its excellent
SPECIFICATIONS
.
Rated
Output
Power: 14 watts continuous, 28 watts
peak.
chClJ"Qctertsti~
under
speaker
load(Including
electrostatic
types) as wellas
the
resistive load normallyused for
test-
Ing. Phase
eerreetlens
have
been provided
at
both
ex-
tremes
of
the
audio
spectrum to insure stability under
all
conceivable
eendltlens
and
to insure that variations in
components
and
constnJctlon wiII not affect the
perfor-
mance. Stability is maintained on all speaker taps
with
loads
rongingfrom
zero
to infinity. Overload
character-
istics
are
excellent
and
the
HF-14will
notexhlbit
bounce
or
flutter
under
pulsed
conditions.
The
HF-14can
be
operated
from any premlpllfier control
unit. A power
take-off
socket
is provided for powering
the
EICO HF-65A.orHF-61Apreanplifier control.
Other
features include a panel mount fuse holder, switched
and
unswitched
convenience
outiets,
and heavy gauge
cad-
mium
plated
steel
chassis finished in
baked
enamel.
1M
Distortion (60cps &
7kc
at
4:
1):
1.7%
at 14 watts,
0.33%
at 26 watts,
0.1%
at
4 watts.
Harmonic Distortion:
8 watts less than 1% from
30c
to
10kc.
10
watts:
less than 1% from
40c
to
10kc.
14 watts: less
thCl"l
1% from SOc to
5kc.
20c
distortion: 2%
at
4.2
watts.
Transient Response:
excellent
square
WeNe
reproduction
(4usec
rise time);
negligible
ringing, rapid settling on IOkc
square
wave.
Invene Feedback:
20db
Stability Margin: 12db
Damping Factor: above
8,
20cps
to 2Okc.
Sensitivity:
1.2S volts for 12 watts
output.
Hum: 90db below rated
output
Speaker Connections: 4, S,
and
16 ohms.
\
Tubes: 1- ECc83/12AX7, 2- ELM, 1-
USI
Power Source: 117 volts, 60 cps.
Power Consumption:
65 watts
~
HWD:
33/4
11
x 12" x
4".
Shipping Weight: 101bs.