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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 AA-1600 power amplifier


High-Performance Rack-Mount Stereo Power Amplifier
The AA-1600 is the first amplifier in our new series of professional-style rack-mount stereo components. Other products in the series include the AD-1701 Graphic Indicator, the AJ-1600 AM/FM Digital Tuner, and the AP-a800 Deluxe Stereo Preamplifier. In performance, specifications and sound reproduction, these products are designed to rank with the finest stereo components available anywhere.
The AA-1600 reproduces the entire musical spectrum with a clarity and definition that make it an excellent choice for use with the most demanding speaker systems. Hhum and noise are a full 100 dB down, so music springs forth from a background of total silence. Transient Intermodulation Distortion, a recently discovered form of amplifier distortion which tends to "muddy" the sound, is so low (less than 0,05%) we're one of the few manufacturers to specify it. This low T.I.M. contributes to clean, well-defined sound especially at the high end of the frequency spectrum. Fused B+ and B- power supply lines for each channel, along with especially rugged output devices, eliminate the need for dissipation limiters which can cause tweeter-damaging clicks and pops from faalse triggering.
Of course, there's complete speaker and circuit protection, including speaker turn-on delay and a thermal circuit breaker.
To assure performance to our superior specifications, the amplifier and power supply circuit boards are supplied fully assembled, tested and adjusted. Minimal point-to-point wiring and a clean, opem chassis layout contribute to easy building. The AA-1600 is designed for mounting in a standard EIA equipment rack, or for installation in the AEA-1800-1 accessory cabinet. The AA-1600 is one of the finest amplifiers Heath has ever designed, and an easy and enjoyable kitbuilding experience too. Make it a part of your music system now.

Specifications
Frequency Response:  7 Hz to 50 kHz ±1 dB
Intermodulation Distortion (SMPTE):  less than 0,05% (from 250 mW to 125 watts)
Transient Intermodulation Distortion (T.I.M.) after, Leinonen, Otala and Curl:  0,05%
Damping Factor:  greater than 50
Hum and Noise:  100 dB below 125 watts
Channel Separation:  70 dB minimum
Input Impedance:  20 k Ω at 1 khz
Input Sensitivity:  1,5 Volts
Power Requirements:   108 to 132 volts, 60 Hz, (60 watts at zero output and 560 watts at full output)
Dimensions (W x H x D):  482,6 x 180,1 x 330,2 mm ( 19" x 7,125" x 13")
Weight:  17,4 kg (38-1/4 lbs)
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