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





Yamaha TC-920B deck


TC-920B - matching the industry's finest separates in appearance as well as performance.
For unparalleled performance, the TC-920B starts with the heads. Yamaha's unique pure Plasma process results in Sendust heads of unparalleled purity, resulting in high permeability of the core for better sensitivity and playback efficiency, excellent Signal-to-Noise ratio, and greatly reduced tape/head wear.
The TC-920B has a vast array of audiophile features. Like the unique Focus switch. In the "Soft" position, you will attain a more relaxing, mellow quality to the overall listening effect. In the "Sharp" position, you get a more crisply punctuated high frequency sound quality. There's also a fine bias adjust control to match the deck's characteristics to those of the actual tape in use.

A switchable subsonic filter cuts out subsonic interference due to warped records, line hum , etc. , and also safeguards your speakers during playback without altering sound quality. The bar-graph peak level meters have a fast/slow switch to adjust the recovery time of the meters for maximum control over the material you are recording.
The 920B's sleek black cabinetry enhances the high-performance look of this studio quality deck. For maximum convenience an ingenious hinged panel conceals the less often used controls. Everything was done with striking esthetics and total performance in mind.
The TC-920B will bring the competition to its knees, and will bring you to your feet, cheering.

Specifications
Type:  4-track, 2-channel stereo cassette deck
Tape Speed:  4,8 cm/sec
Motor:  F.G. servo motor
Wow and Flutter:  less than 0,03% (WRMS)
Fast Forward/Rewind Time:  within 75 seconds with C-60 tape
Recording /Playback Frequency Response:
LH tape :  30 - 16,000 Hz (±3 dB)
CrO₂ Tape :  30 - 18,000 Hz (±3 dB)
Total Harmonic Distortion (1 kHz, 160 nwb/m);
LH Tape :  less than 1,0%
CrO₂ Tape :  less than 1,6%
Signal-to-Noise ratio:  better than  60 dB (CrO₂, NR off); better than 52 dB (CrO₂, DIN, 333 Hz, 3%T.H.D., NR Off)
Dolby NR Effect:  better than 9 dB
Channel Separation:  more than 30 dB (at 1 kHz)
Bias Frequency:  105 kHz
Input Sensitivity/Impedance
Mic :  0,3 mV/5 k Ω
Line :  60 mV/50 k Ω
Output Level/Impedance:
Line :  340 mV9reference level, playback volume at max)
Phones :  1 mW/8 Ω, 4 mW/150 Ω
Semiconductors:  67 Transitors; 45 Diodes; 9 IC's, 2 FET
Power Supplies:  110 - 130 V / 220 - 240 V AC 50/60 Hz
Power Consumption:  14 W
Dimensions (W x H x D):  435 x 140 x 286 mm (17-1/8" x 5-1/2" x 11-1/4")
Weight:  9 kg  (19 lbs 13 oz)



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