General Description; Specifications - Eico HF 12 Instruction Manual

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 a re 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 Wi lIiamson-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 fl exible
design permits easy console installation with com pie t e
shielding 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: 1 W : ±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 11 W; 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.
*
Transient 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.
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