Specifications
MODEL
HF
12
12
WATT
INTEGRATED
HIGH
fIDELITY
AMPLIfIER
general
description _
GENERAL
The HF12 is a true high
fidelity
12-watt
integrated
ampl
i-
fier absolutely free of the "gimmi cks" sometimes used in
low-priced amplifiers. It provides complete "front end"
facilities and true high
fidelity
performance of such
ex-
ce llence
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 far magnetic phono (RIAA) and
tape head (NARTB).
Low
noise dual triode preamplifier
with
accurate,
low distortion
equal
izatlon
for
either
Input.
SPECIFICATIONS
Output Power: 12 watts
continuous,
25 watts
peak.
2.
Two high level inputs for
tv,
tuner,
and crystal or
ceramic ca rtridge.
3.
Unused inputs are shorted
at
every
position of the
in-
put
selector
switch for
zero
cross-talk.
4.
DC superimposed on all tube fi laments to el imina te
cathode-heater
leakage as a source of hum.
5. Low-no ise dual triode used
exclusively
for
separate
bass and
treble
tone controls. Extremely low
distortion,
variable
crossover,
feedback-type
circuit.
6 . Highly
stable
WilIiamson-type
powerampllfier
c
ircuit
.
7.
Newly-designed
"flat"
construction,
utilizing
horizon-
tal chassis to permit
properlayout
and
component
separa-
tion necessary for long component
life.
Extremely flex
ible
design permits
easy
console
installation
with
com
pie
t e
sh
ielding
and
adaptability
to
any
panel thickness.
*
1M
Distortion (60 & 6000 cps
at
4:
1):
1.3%
at
12 W;
0.55%
at
6W;
0
.3%
at
4W.
* Frequency Response: 1W :
±0.5db
12 cps -
75kc;
12W:
±0.5db
25 cps _
20kc.
*Harmonic Distortion:
20cps:
2%
at
4
.2W;
1/2%
at
2.5W;
30cps
: 2%
at
11W;
1/2%
at
6.3W;
40cps
: 1%
at
12W;
1/
2%
at
9.3W;
2000 cps :
1/2%
at
12W;
10kc
: 1%
at
lOW;
1/2%
at
6W.
* Transi
ent
Response:
excellent
square
wave
reproduction (4 usec risetime);
negligible
ringing,
rapid
settling
on 10 kc .
square
wave.
* Transient Distortion (60 cps tone burst>: less than 1%
at
full power.
1
COPYRIGHT (C) 19 60
ElECnONIC
IN sn UM ENT
COMPANY
, In e.