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Eico HF-20 User Manual

Eico HF-20
29 pages
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HIGH
FIDELITY
AMPLIFI
ER
MODEL
HF-20
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Eico HF-20 Specifications

General IconGeneral
TypeTube Amplifier
Power Output20 watts
Output Impedance4, 8, 16 ohms
Dimensions15.5 x 10 x 6.5 inches
Weight35 lbs
Total Harmonic Distortion (THD)1%
Frequency Response20 Hz to 20 kHz
Input Impedance500k Ohms
Tubes Used12AX7
InputsPhono, Tuner, Aux
OutputsSpeaker terminals, Tape output
Tubes6L6GC, 12AX7, 12AU7

Summary

Product Description

Preamplifier-Equalizer Circuit

Details the low-distortion preamp-equalizer circuit with feedback equalization for various recording curves.

Power Amplifier

Explains the Ultra-Linear Williamson type power amplifier and its 25-watt output transformer.

Installation Guide

General Installation Factors

Covers ventilation, control access, parts accessibility, and acoustical isolation for proper setup.

Electrical Connections

Guides users on connecting speakers, phono inputs, and high-level sources to the amplifier.

Operation Instructions

Listening to Sources

Instructions for operating the amplifier with various sources like phonograph, tuner, and tape recorder.

Tone and Loudness Controls

Explains the function and adjustment of bass, treble, and loudness controls for optimal sound.

Troubleshooting and Maintenance

Maintenance

Covers routine maintenance, including tube replacement and troubleshooting tips.

Trouble Shooting Chart

Lists common symptoms, their causes, and remedies for diagnosing amplifier issues.

Construction Procedure

General Construction Instructions

Offers advice on component identification, soldering techniques, and wiring practices.

Chassis Assembly and Wiring

Details the step-by-step process for assembling the main chassis and performing preliminary wiring.

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