What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

Heathkit AA-100

 Value Leader in the Industry - The versatile and powerful AA-100 features 5 pairs of inputs like; magnetic cartridge, AM and FM tuners, stereo tape reocrder, FM stereo tuner and auxiliary; separate monophonic input, versatile  controls, (preamp input level, power amp input level, hum balance, ganged volume, balace and separation  and separate concentric bass and treble controls); three different speaker impedance (4, 8, 16 Ω); plus left, right and center channel speaker outputs.

Styling Matches the AJ-41, easy-to-own.  The luggage-tan vinyl-clad steel cabinet with polished trim and soft refracted lighted slide-rule dial matches the AJ-41 styling above. You enjoy this, deluxe features, performance and styling, at the unbelievable low price. 
 Deluxe Heathkit "Tube-Type" Stereo Amplifier.
Offers  versatile performance, finger-tip convenience and modern styling
AA-100 Features:
Hi-Fi rated ar 50 watts (25 watts per channel)
Five stereo input  and versatile controls
Mixed channel center speaker output
Separate monophonic phono input
Easy circuit board assembly
Matches the AJ-41 tuner in styling and performance
 Due to the equalization present in Phono and Tape Head positions, the meter readings for these inputs contain a considerable amount of random low-frequency noise, most of which is sub-audible.  Such noise is due to thermal agitation in tubes and resistors, contact resistance effects in electrolitic capacitors, power line variations, etc. In evaluating noise, the audibility of its various components must be considered. The extreme input sensitivity (1 mV) of the AA-100 Tape Head input must also be borne in mind.
The actual 60 Hz hum (and harmonics) included in the readings is very  small, compared to the mostly sub-audible noise components referred to above. As a matter of fact, the AA-100 is almost completely free from hum, for practical purposes.
Channels:  Two channel stereo.
Power Output:  
Monophonic :  50 watts
Stereophonic : 25 watts per channel
Music Power Rating
Monophonic :  60 watts (0.7% THD, 1 kHz)
Stereophonic :  30 watts (0,7% THD, 1 kHz)
Power Response:   30 Hz to 15 KHz  ±1 dB at 25 watts output per channel.
Harmonic Distortion:  
Less  than 0.5% at 25 watts, 1 kHz .
Less than 2% at 25 watts 30 - 15,000 Hz  (each channel).
Intermodulation Distortion:  less than 1% at 25 watts, 60 and 6,000 Hz signals mixed 4:1 (each channel).
Hum and Noise:  
Mag phono 55 dB below 25 watts output at 6 mv sensitivity
Tape Head :  35 dB below 25 watts output.
Tuner and aux : 70 dB below 25 watts output.
Channel Separation:  42 dB  min. at 1 kHz  
Input Sensitivity (For 25 watts output per channel)
Mono  Mag. Phono :  1.5 mV
Stereo Mag. Phono :  1.5 mV
Tape Tead :  1 mV
Tuner :   0.2 V
Aux 1 & 2 0.2 V
Input Impedance:
Mag phono :  47 K Ω  (may be changed)
Tape  Head :  470 K Ω
Tuner & Aux :  250 K Ω each.
Outputs:  4, 8 and 16 Ω ; cathode follower tape recorder outputs.
Damping factor: 15
Channel Sepration:  42 dB minimum at 1 kHz  
Phono :  RIAA curve
Tape Head :  NARTB  tape playback curve,
Tone Controls:
Bass :  15 dB boost and 17 dB cut at 30 Hz
Treble :  12 dB boost and 20 dB cut at 15,000 Hz
Controls: Function switch (4-position); selector switch (6-position); balance control (total range, 16 dB); separation control; ganged level controls; dual-concentric bass & treble controls; phase and power switch.
Tube complement:  2 x EF86, 4 x 12AX7, 2 x 7199, 4 x 7591, 1 x GZ34, 1-selenium bias rectifier.
Power requirements:  117 volts, 50/60 Hz
Power  Consumption:  150 watts.
Power Outlets:  2 AC receptacles, 1 switched, 1 unswitched.
Dimensions (H x W x D):  5" x 15¾" x 13½" (allow 1" for cables at rear).
Shipping Weight:  34-1/2 lbs.
Net Weight:  28-3/4 lbs

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