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





Sony TC 252-D reel-to-reel


A Really Spectacular Buy
The new solid-state stereophonic Sony model 252-D is loaded with exciting quality features including sound-with-sound. Handsomely mounted in a low profile walnut wood cabinet. Here is the most tape deck recorder for the money. And it's a Sony.
Scraoe Flutter Filter
Special precision idler mechanism located between erase and record/playback heads eliminnates tape modulation distortion. This feature formerly found only on professional studio equipment.
Sound-with-Sound
A versatile feature that enables you to record on one channel while listening to the other . Ideal for learning or teaching foreign languages as well as perfecting diction, singing and instrumental music.
VibrationFree Motor
An important new Sony development utilizing "floating" shock absorber action to isolate completely any  motor vibration from the tape mechanism.

Four-Track Stereophonic and Monophonic Recording and Playback
Seven inch reel capacity provides hours and hours of stereo enjoyment. Stereo headphone jack for private listening. Automatic sentinel shut-off. Two VU meters. Pause control, Three-digit tape counter. Record interlock.  Separate record selector buttons. Vertical or horizontal operation
Non-Magnetizing Record Head
Head magnetization build-up , the most common cause of tape hiss - has been eliminated by an exclusive Sony circuit which prevents any transient surge of bias current to the record head.
Instant Tape Threading
Exclusive Sony Retractomatic pinch roller permits simple one-hand tape threading. An automatic tape lifter protects heads fom wear during fast forward and rewind.
Specifications 252-D
Recording System:  4-track stereophonic or monophonic
Heads:
1 Rec/ Pb :  PP30-4202N
1 Erase :  EF 18-2902A
Tape Speed:  7-1/2 ips (19 cm/s) and 3-3/4 ips (9,5 cm/s)
Frequency Response
7-1/2 ips (19 cm/s) :  30 - 18,000 Hz
3-3/4 ips (9,5 cm/s) :  40 - 13,000 Hz
Signal-to-Noise Ratio:  52 dB
Bias Frequency:  85 kHz
Wow and Flutter
7-1/2 ips (19 cm/s) :  0,12%
3-3/4 ips (9,5 cm/s) :  0,15%
Recording Time (with 1,800 ft tape)
4-track Stereo :  3 h at 3-3/4 ips (9,5 cm/s)
4-track Mono :  6 h at 3-3/4 ips (9,5 cm/s)
Inputs Sensitivity/Impedance
Mic :  72 dBs (0,19 mV) / 600 Ω
Aux, Input :  22 dBs (60 mV) / 560 k Ω
Outputs Impedance
Line Out :  more than 100 k Ω
Phone :  8 Ω
Outputs Level
Line Out :  0 dBs (0,775 V) at 100 k Ω load
Semiconductors:  13 Transistors; 3 Diodes
Power Requirement:  117 V AC 60 Hz
Power Consumption:  30 W
Dimensions (W x H x D):  386 x 190 x 340 mm (15-1/4" x 7-1/2" x 3-7/16")
Weight:  8 kg (17 lb 11 oz)

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