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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





Dynaco Stereo 120

 The  Dynaco Streo 120 is an all silicon transistor basic power amplifier for use with separate preamplifiers such as the Dynaco PAT-4 or PAT-5, or for use with tape recorders or tuners such at the FM-5 or AF-6, which have their own volume controls. The Stereo 120 contains two 60 watt amplifiers on one chassis with a common power supply.
 Although the Stereo 120 is an solid state device, containing transistors and similar semi-conductors, it has been designed to be used under normal conditions without special safety precautions, just as if it were a high grade tube amplifier. Thus it can be connected to source and speaker components and used with confidance in all conventional arrangements. There are no circuit breakers, speaker fuses, or other resettable devices to impede the use of the Stereo 120 under any reasonable conditions of use or abuse. This is achieved by using novel circuits which automatically and instantly protect the amplifier.
 The components in the Stereo 120 are of the highest quality to protect against failure, both now and for many years in the future. All parts are used conservatively with close tolerances to assure proper operation, and etched circuit modules are pretested under actual use conditions to ensure that every unit, after assembly, will meet the specifications normally associated with laboratory prototypes.
 The specifications of the Stereo 120 speak for themselves. The distortion at low levels is comparable to that of the finest tube designs, while the high power distortion remains inaudible. Specifications do not reveal all the facets of sound quality. However. In use with varying program material, the Stereo 120 justifies its design efforts to have qualities of ease and naturalness always sought and rarely achieved in solid state designs. There is no extra brightness or stridency which is unfortunately someties attributed to high fidelity sound, but rather there is an impression of limitless range and efortless handling of the highest power peaks.
 Like any precision equipment, the superior capabilities of the Stereo 120 will best be obtained when it is utilized properly.
 
Specifications
Power Output Rating:
60 watts everage continuous power per channel into 8 Ω at any frequency between 25 Hz to 15 kHz at less than 0,5% THD. Distortion decreases at lower power levels. This is in accordance with F.T.C. rating requirements, including preconditioning.
Frequency Response:
5 Hz to 100 kHz  ±0,5 dB
Intermodulation Distortion:
Less than 0,5% at any power level up to 60 watts per channel into 8 Ω with any combination of test frequencies. Distortion reduces at lower power levels.
Noise:
95 dB below rated output unweighted with shorted input; 100 dB down by IHF standards
Damping Factor:
Creater than 40 from 20 Hz to 20 kHz
Separation:
More than 70 dB from 20 Hz to 20 kHz
Input:
100 k Ω, 1,5 volts for 60 watts output
Semiconductor Completed:
15 transitors; 15 diodes
Power Requirements:  100, 120, 220, 240 V 50/60 Hz
Power Consumption:  400 watts
Dimensions (W x H x D):  13" x 4" x 10,5"

Weight:  20 lbs

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