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

TEAC A-7030

Teac A-7030U Stereo Tape Deck.
An all-solid-state. Single-direction, 2-track record/playback7erase, plus ¼-track playback stereo tape deck. The A-7030 is designed for the demanding professional or the discriminating
audiophile. This superb deck has a capacity up to the 10½" NAB reel size and operates at 15 or 7½ ips, with performance comparable to that of the finest professional sound studio equipment.
Wow and flutter are an exceptionally low 0,05%, frequency response is 30 to 20,000 Hz and the
signal-to-noise ratio is a high 58 dB. The unique TEAC Proline ™ hyperbolic heads, a massive inertial flywheel for tape travel stabilization and the rugged, precise TEAC 3-motor transport ensure the utmost in sound quality. Operation is fast and always under your control with our symmetrical touchbutton control system and solenoid/reley actuators. The A-7030 includes

instant off-the-tape monitoring, mic-line mixing, pushbutton high speeed cueing and automatic rewind and shut-off. Options such as a full remote control and floor-standing wooden console make it even more versatile.

TEAC A-7030
Tape transport
Heads: Four separate heads assembled in plug-in unit
2-track erase, 2-track record, 2-track forward playback, 4-track forward playback
With optional THA-75 Head assembly:
4-track erase, 4-track record, 4-track forward playback, 2-track forward playback
Erase: 2,2 kohms at 100 kHz, Erase current … approx. 35 mA
Record: 1,6 kohms at 10 kHz Bias current… approx. 1,1 mA
Reel Size: 10½" max. NAB reel
Tape Width: Standard ¼ inch tape
Tape speed: 15 and 7 ½ ips (±0,5&)
Motors: one 478 Pole dual speed hysteresis synchronous motor for capstan drive, two 6-pole eddy current motors for reel drive
Wow and Flutter (measured according to weighted NAB standard using TEAC flutter free tape):
15 ips: 0,05%
7½ ips: 0,08%
Fast Winding Time: Approx. 200 sec. For 3,600 ft (10½" NAB reel)
Starting Time: 1 sec. To reeach stable speed

Controls: The tape motion is controlled by four pushbuttons; rewind, fast, forward and stop. Tape speed is selected by the motor winding switch.

Frequency Response (overall from recording input to playback output):
15 ips: 40 to 20,000 Hz, ±2 db
7½ ips: 50 to 15,000 Hz, ±2 dB
Signal-to-noise ratio (Peak record level to unweighted noise):
58 dB for 2-track,
55 db for 4-track
Crosstalk Rejection:
45 dB channel to channel at 1 kHz,
40 dB between adjacent tracks at 100 Hz
Input Microphone: high impedance unbalanced, 10 kohms, o,5 mV minimum
Line Input: 200 kohms, 0,1 V minimum
Output: 1 V for load impedance of 100 kohms or more
Equalozation (NAB equalization):
15 ips: 50µ sec
7½ ips: 50µ sec
Bias Frequenct: 100 kHz push-pull oscillator
Erasing Effect: 60 dB at 15 ips tape speed
Distortion at 1Hz: 1,5% at operating level
Monitoring Headphones: Low impedance, 8 ohms
Transistors (silicon):
4 x 2SC369, 4 X 2SC372, 2 X 2SC491, 2 X 2SA494, 8 X 2SC733, 4 X 2SC732
Power Requirements: 100/115/200/220/240 V AC, 50/60 Hz
Power Consumption: 150 W max.
Dimension(H x W xD): 20"x 17½" x 8¼")
Weight: 62 lbs

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