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-1500A

 We've improved upon the Classic receiyer.
The tradition of heathkit stereo receiver superiority began in 1967 with the heathkit AR-15. then in 1971 came the Ar-1500. now, it's the AR-1500A, the world's classic receiver, improved once again. Design advancements include.

Phase lock Loop (PLL) multiplex demodulator with only one simple adjustment, your assurance of maximum separation, droft-free performance and long-term stability. Simplification of the AGC circuit resulting in significant improvements in AM performance. Improved output protection for better drive capability over taday's wider range of speaker impedances.

Now Easier To Build
In redesigning the AR-1500A, special care was given to making the kit even easier to build than before. A separate check-out meter is used to check out each step as assembly progresses. Factory-installed cable connectors are another new kitbuilding aid.
 Still tops in performance.
The precedent-setting performance specifications of the AR-1500 have, of course, been retained. Conservatively rated, the Ar-1500A puts out 180 watts, 90 per channel, into 8 ohms, with both channels driven, with less than 0,25% harmonic distortion. Two computer designed five pole LC filters and the 4-gang, front end combine for an FM selectivity beter than 90 dB with 1,8 µV sensitivity. And here are some things the specs won't show you. There are outputs for two separate speaker systems, two sets of headphones, preamp output, and monitoring of FM with an ascilloscope such as the Heathkit Audio-Scope. Standard inputs - all with individual level controls. Electronically monitord amplifier overload circuitry.
Tuner FM Section
Sensitivity:  1,8 µV
Selectivity:  90 dB
Image rejection:  100 dB
IF Rejection:  100 dB
Capture ratio:  1,5 dB
Harmonic Distortion: 0,5% or less
Intermodulation Distortion:  0,1% or less
Channel Separation:  40 dB or greater at midfrequencies; 35 dB at 50 Hz; 25 dB at 10 kHz; 20 dB at 15 kHz
Tuner AM Section
Sensitivity:  50 µV with external input; 300 µV per meter with radiated input
Selectivity:  20 dB at 10 kHz;60 dB at 20 kHz
Image Rejection:  70 dB at 600 kHz; 50 dB at 1400 kHz
IF Rejection:  70 dB at 1000 kHz
Amplifier Section
Dynamic Power Output per Channel:
Music Power Rating:  90 watts (8 Ω load);  1200 watts (4 Ω load);  50 watts (16 Ω load)
Continuous power Output per Channel:  60  watts ( 8 Ω load);  100 watts (4 Ω load); 40 watts (16 Ω load)
Power Bandwidth (for constant .25% THD):  less than 8 Hz to greater than 30 kHz
Frequency Response (1 watt level):  9 Hz to 80 kHz,  -1 dB
Harmonic Distortion:  less than 0,25% from 20 Hz to 20 kHz at 60 watts output
Intermodulation Distortion:  less than 0,1% with 60 watts output
Damping Factor:  Greater than 60
Channel Separation:  55 dB (Phono)
Output Impedance (each channel):  4 Ω through 16 Ω
Dimensions (W x H x D):  18-1/2" x 5-1/8" x 13-7/8"
Weight (less cabinet):  53 lbs

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