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Eico HF-81

Stereo Integrated Tube Amplifier (1958-63)

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Eico HF-81


The EICO Model HF-81 is a complete high fidelity stereophonic control center and a pair of 14 watt amplifiers; all on one chassis.

With it you can select pre amplify, and control accurately any stereophonic source (tape, discs, or broadcasts) and feed it through the self-contained dual 14 watt amplifiers to a stereo pair of speaker systems.

When you play a monophonic source, the 14 watts available per channel adds up to a total of 28 watts for your two speaker systems.

If you desire, both amplifiers can be connected in parallel and driven by one pre-amplifier control section while the other pre-amplifier control section is free to drive an external power amplifier.

In this way your old amplifier can be put to use in a stereophonic system.

Construction is of the low silhouette type that permits you to dispense with cabinetry if desired.


Power output: 14 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 100kHz

Total harmonic distortion: 1%

Damping factor: 8

Input sensitivity: 6mV (mic), 4mV (MM), 500mV (line)

Signal to noise ratio: 57dB (mic), 60dB (MM), 75dB (line)

Speaker load impedance: 4Ω to 16Ω

Valve complement: 4 x ECC83, 2 x ECC82, 2 x EZ81, 4 x EL84

Dimensions: 15 x 4.75 x 10.5 inches

Weight: 24lbs


schematics   English -

operation/service/construction manual   English - CometCKO

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