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

Marantz Model 7T

Marantz deliberately withheld its entry into solid state products until it was possible to step into the position of leadership in this field. Now, Marantz engineers have develpoed new methods of solid state application to produce a circuit design equalling the matchless performance and dependabilility of the previously unmatched Marantz designed vacum tube 7C preamplifier.
The new Model 7T delivers unequalled specifications for low noise and low distortion, without the usual transistor problem of inadequate signal handling capacity or dynamic range. The widest dynamics excursions on your favorite record or tape will not overload the sensitive low-level phono stages.
This has not been possible in previous solid state equipment, since the quietest operation of a transistor is the very condition under which it will produce clipping and distortion with normal input signals. Marantz solid state circuitry now has solved this problem, and traditionally impeccable performance is assured in the new Marantz Model 7T Solid State Stereo Preamplifier.

2Front Panel Jacks
For recording, copying or playback with an external tape recorder.
Panel Headphone Jack
Built-in circuit for driving popular low or high impedance phones. Sound automatcally cuts off from speakers when headphones are plugged in.
Center Channel Output
Separate A + B mixing circuit with level control to drive one or two additional amplifiers for "center" channel or remote monophonic speakers. Low impedance output.
Tape Play / Tape Copy Switch
New circuit and switching permits tape recording playback or monitoring plus, duplication of tapes with front panel and rear panel recording outputs. They are capable of driving either low or high impedance recorders with low distortion. Stereo program material can be mixed and recorded monophonically if desired.
Other Features
Selector Switch with automatic equalization insertion, Mode Switch, precision Tracking Volume Control, Selectable-Curve Feedback Tone Control, High Filter, Rumble Filter, Power Switch, Output Level Adjustment for high or low efficiency speakers, Tape-head Equalizer Adjustment, 6/AC Convenience Outlets, Panel Headphone Jack, Panel Tape Recorder and Playback Jack, Two Center Channel Outputs.

Gain: Phono to main output - 64,5 dB; Phono to recording output - 42,5 dB; High level to main output - 22,5 dB
Frequency Response: 20 to 20,000 cps, ±1 dB
Total Noise: 20 to 20,000 cps; 80 dB below 10 mv input. (1uv equivalent broadband noise input with or without RIAA equalization)
I.M. Distortion: 0,15% at 10 volts RMS output
Total Harmonic Distortion: 0,05% at 1 volts RMS
High Filter: 9 kcp, 5 kcp
Low Filter: 50 cps, 100 cps
Hum and Noise: 100 dB below high level input
Signal to Noise Ratio: 100 dB
Dynamic Range, Phono Input: Approx. 100 dB above 1uv equivalent noise input. (1uv to 100 millivolts at less than 0,15% I.M.D.)
Weight: 9 lbs

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