Eico HF 12 Owners Manual

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12 WATT INTEGRATED HIGH FIDELITY AMPLIFIER

MODEL

HF-12

k INSTRUCTION . .

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general description

MODEL HF 12

I2 WATT INTEGRATED
HIGH FIDELITY AMPLIFIER

GENERAL

The HFlZ is a true high fidelity lZ-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 l2s
may be used for stereo tape reproduction, each amplifier
connecting directly to a tape head with no other electronic
equipment required.

FEATURES

l. Two low level inputs for magnetic phono (RlAA) and
tape head (NARTB). Low noise dual triode preamplifier
with accurate, low distortion equalization for either input.

SPECIFICATIONS

Output Power: l2 watts continuous, 25 watts peak.

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
boss and treble tone controls. Extremely low distortion,
variable crossover, feedback-type circuit.

6. Highly stableWilliamson-type power amplifier circuit,

7. Newly-designed "flat construction, utilizing horizon-
tal chassis to permit properlayout and component separa-
tion necessary forlong component life. Extremely flexible
design permits easy console installation with complete
shielding and adaptability to any panel thickness.

* IM Distortion £60 A 6000cgs at 4 : it: 1.3% at 12W; 0.55% at 6W; 0.3% at 4W.
Freguency Resanse: iW :i0.5db l2 cps -- 75kc; l2W : $0.5db 25 cps - 20kc.

Harmonic Distortion: 20cgs: 2% at4.2W; l/2% at2.5W; 30cps : 2% at llW; i/2°/o at 6.3W; 40cps : i% at l2W;
l/2°/o at 9.3W; ZOOOCES : l/2% at l2W; lOkc : l% at lOW; l/2% at 6W.

* Transient Response: excellent square wave reproduction (4 usec risetime); negligible ringing, rapid settling on iOkc.

square wave .

* ransient Distortion (60 cps tone burst): less than i% at full power.

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