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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 AR-1515

From its half-inch tall LED frequency readouts to its extraordinarily low distortion, the Heathkit AR-1515 is the finest receiver heath has ever designed.
The Ar-1515's digital Readout is far more accurate thas dial-type tuning. Simply tune to the exact frequency you want. Signal-strength and center-channel meters then help you "zero in" on the strongest signal and lowestFM distortion. There's even an oscilloscope output to monitor multipath distortion.
The amplifier section meets the same high standards. That extra margin of performance assures clean, wide-range sound without audible strain or struggle on even the most complex musical passages. And you'll hear the music over a background of silence - hum and noise are 65 dB below full output in phono and 80 dB below full output on high-level sources.

The amplifier section is also unmatched in convenience. All the frequently used controls - volume, input selector, stereo/mono switch, tuning - are on the front panel. The secondary controls are concealed behind a hinged door. Convenient indicator lights on the front panel show, the input you've selected. The digit light only when listening to AM or FM and only the necessary tuning meters are illuminated - signal-strength only for AM, signal-strength and center-tune for FM.
The bass and treble controls act primarlly at the frequency extremes to compensate for room acoustic and program deficiencies while maintaining smooth midrange response. And the AR-1515's  preamp out/amp injacks allow it to be used with any audio equalizer, such as the Heathkit AD-1305.

The AR-1515 is even easy to build. Obviously the AR-15151 is a complex and sophisticated receiver, but its well thought out, modular design and color-coded wiring harnesses simplify assembly

Specifications
Amplifier Section
Frequency Response:  8 Hz to 45 kHz (+0 -1 dB);  4 Hz to 80 kHz (+0 -3 dB)
Intermodulation Distortion:  less than 0,08% (from 0,25 to 70 watts, full output)
Damping Factor:  greater than 60
Input Sensitivity:
Phono 1 , 2 :  2 mV
Aux, Tape , Dub. :  200 mV
Input Overload:
Phono :  greater than 100 mV
Aux, Tape,  Dub. :  greater than 10 V
Hum and Noise:
Phono (2 mV reference) :  --65 dB
Aux, Tape, Dub. (200 mV reference):  -80 dB
FM Monophonic
Frequency Response:  20  - 15,000 Hz  ±1 dB  
Antenna:  75 Ω or 300 Ω
Sensitivity:  1,8 µV
Selectivity:  100 dB
Image rejection:  90 dB
Mute Threshold:  0 -5 µV variable
FM Stereophonic
Channel Separation:  40 dB or greater at mid-frequencies;  35 dB at 100 Hz; 20 dB at 10 kHz; 20 dB (Nominal) at 15 kHz
Harmonic Distortion:  0,35% with 100% modulation
19 and 38 kHz Suppression:  60 dB
SCA Suppression:  60 dB
 AM Section
Sensitivity:  5 µV with 50 Ω direct input
Selectivity:  200 dB at 10 kHz
AM Antenna:  external static-shielded loop
Image Rejection:  70 dB at 600 kHz, 50 dB at 1400 kHz
General
Accessory AC Outlets:  One switched and one unswitched
Power Requirement:  120/240 V AC,  50/60 Hz
Dimensions (W x H x D):  21-1/2" x 6-3/16" x 15"
Weight (net):  35,8 lbs
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