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

Hitachi D-E99 cassette deck

The Hitachi model D-E99 is a three -head stereo cassette deck with microprocessor-controlled adjustment for record bias, equalization, and tape sensitivity. It incorporates both Dolby B and Dolby C noise-reduction systems. And uses a solenoid-operated twin-capstan drive system with motor for the capstan and second for the reel hubs.
Also features:
Automatic Tape Response System (ATRS); Titanium-Surfaced Rec and Play Combination 3-Head System; Metal Tape Compatibility; Dual Fluorescent Peak Level Meter; Electronic Digital Counter, and Timer Rec/Play Capability

Motor:  FG servo motor and DC motor
1,4 mm gap Metal Rec/Pb ferrite head
Ferrite guard Metal erase Permalloy head
58 Transistors ; 58 Diodes; 2 FETs; 14 LEDs; 11 ICs; 5 Modules
Track System:  4 track, 2 channel stereo
Tape:  cassette Tape C-30. C-60, C-90
Tape Speed:  4,75 cm/s
Recording System and Bias Frequncy:  AC bias, 105 Hz
Erasing System:  AC erase
Erase Ratio:  65 dB or more (at 1 kHz)
Frequency Response:
Normal :  20 Hz - 19 kHz (30 Hz - 17 kHz ±3 dB)
Cro2 :  20 Hz - 21 kHz (30 Hz - 18 kHz ±3 dB)
Metal :  20 Hz - 21 kHz (30 Hz - 19 kHz ±3 dB)
FeCr :  20 Hz - 19 kHz  (30 Hz -17 kHz ±3 dB)
Signal-to-Noise Ratio
Dolby NR Off :  61 dB (weighted A, reference 3% THD.  Metal tape)
Dolby B NR On :  69 dB (weighted A, reference 3% THD. Metal Tape)
Dolby C NR On :  75 dB (weighted A, reference 3% THD. Metal Tape)
Wow and Flutter:  0,032% WRMS (0,10% DIN)
Input Sensitivity/ Impedance:
Microphone :  0,4 mV/  300 Ω - 5 kΩ
Line In :  100 mV/ 50 k Ω or more
Output Level:  500 mV
Output Load Impedance:
Line Out :  50 k Ω or more
Headphones :  8 Ω - 2 k Ω
Distortion:  0,8 % (1 kHz , 160 nwb/m)
Crosstalk:  60 dB or more (at 1 kHz)
Channel Separation:  30 dB or more (at 1 kHz)
Power Supply:  AC 120V, 100-110 V, 115-127 V, 220-220 V, 230-240 V, 50/60 Hz
Power Consumption:  29 W
Dimensions (W x H x D):  435 x 110 x 282 mm
Weight:  6,3 kg

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