Features; Specifications - Eico HF-35 Instruction Manual

FEATURES
1.
EF86 phenomenally low-noise, high gain, voltage
preamplifier*
2.
D
t
rec
t
coup
1 i
ng
between vo
I
to
ge preamp]
Ifler
and phase
inverter
to
eliminate a time constant*
3*
6SN7GTB
cathode-coupled ("long-tailed
11
)
phase
in-
verter for
forced
balance over
the entire
frequency and
dynamic
range.
Provides drive
for
the output stage from
equal and
comparatively low impedances,
4*
EL34/6CA7
output pentodes
in
a push-pull Ultra -Lin-
ear output stage,
5.
Carefully balanced, extremely high quality wide-
band
output transformer
employing grain -oriented
steel
and
extensively interleaved windings,
A
superb high-
frequency
roll
-off characteristic permits
achievement
of
the virtually
absolute
stability
sought
for
in
the design.
The
transformer
is
supplied
fully
potted
and
with 4,8,
and 16
ohm
output taps.
6,
Heavy
duty power
transformer with
reserve capacity
for
powering any
preamplifier*
7,
Extra-rugged
GZ34
rectifier
tube with indirectly heat-
ed cathode
to
el
iminate high
starting
voltage on
the
elec-
trolytic
filter
capacitors
and
to
delay
the application of
the
full
B+
voltage
to
the amplifier tubes
until
they have
warmed
up,
8,
Input level control,
9- Fuse
and
panel mount
fuse holder*
10*
Standard
octal
socket provided
for preamplifier
power
take-off
and remote
on-off switching,
11,
Switched and unswitched
AC
convenience
outlets*
12,
Heavy gauge
steel chassis.
SPECIFICATIONS
Rated
Output Power
:
35
watts continuous;
70 watts peak.
1
M
Distortion (60
&
6000
cps
at
4
:
1):
below
1,
5%
at
35
watts;
0*
15%
at
20
watts*
Total
Harmonic
Distortion
:
below
0.
5%
at
any frequency from
2Gcps
to
20 kc
within
1
db
of 35
watts.
Undistorted Sinusodlal
Frequency
Response:
±0.
5db
5 cps
to
60kc
at
l
watt
level;
±0*
I
db 20cps
to
30kc atony
level
from
1
milliwatt
to
35
watts;
no peaking
or raggedness outside audio
range.
Square
Wave
Response
s
20
cps
to
20kc
essential/ undistorted;
3,5 micro-seconds
rise
time;
no
overshoot
at
any
frequency
or
power
level nor
visible
rounding
below
15ke*
Inverse
Feedback; 20 db
Stability
Margin
;
1
8
db
Damping
Factor:
above
10,
20cpsto20kc;
15 at
lkc.
Sensitivity
^
0.
43
volt for
35
watts
out*
Hum: 90
db
below
rated output.
Speaker Connections:
4, 8,
and
16
ohms*
Tubes 2- EL34/6CA7,
1-
EF86/Z729, 1-
65N7GTB,
1
-
GZ34.
Power
Source:
110-120
volts,
60
cycles;
130
watts; 3
amp
fuse*
Size:
HWD: 7" x 14"
x
8'
1
Weight; 25
lbs.
2