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

Optonica RT-105H Tape-Deck

Optonica RT-105H
Stereo Cassette Tape-Deck with Microcomputer Full Logic Control System
Greater reliability and convenience in the transport system of the RT-105H are brought about by digital control technology. A microcomputer-controlled full logic system not only makes operation easier for you, it also makes it easier on the deck's transport mechanism through soft-touch control and direct switching of modes. APSS is provided for one-touch skipping or repetition of desired selections, while the auto space control uses digital circuitry for the insertion of blank spaces between songs. A high-performance hard permalloy head ensures optimum performance with all types of tapes, including metal. Performance and convenience are further assured with Dolby Noise Reduction circuitry, full-function remote control and peak level meters.

Motor:  Electronically-controlled DC motor for reel drive
Record/Playback :  hard permalloy
Erase :  Double-gap ferrite
Wow and Flutter:  ±0,20% (DIN 45 500);  0,07% WRMS
Tape Speed Deviation:  ±2%
FF/REW Time :  10 sec (C-60)
Frequency Response:
Normal Position :  40 - 13,000 Hz (±3 dB); 40 - 14,000 Hz (DIN 45 500)
CrO₂ Position :  40 - 15,000 Hz (±3 dB);  40 - 16,000 Hz (DIN 45 500)
Fe-Cr Position :  40 - 15,000 Hz (±3 dB):  40 - 16,000 Hz (DIN 45 500)
Metal Position :  40 - 16,000 Hz (±3 dB): 40 - 17,000 Hz (DIN 45 500)
Signal-to-Noise Ratio (Fe-Cr Tapes):
Dolby NR off :  56 dB
Dolby NR on :  66 dB at over 5 kHz
Recording System:  AC bias (105 kHz)
Erase System:  AC erase (105 kHz)
Input Sensitivity/Impedance:
Mic :  0,2 mV/ 6,8 k Ω
Line -In :  50 mV/ 50 k Ω
Rec/Pb (DIN) :  0,2 mV/ 6,8 k Ω
 output Level/Impedance:
Line-Out :  550 mV/50 k Ω at 0 dB
Rec/Pb (DIN) :  550 mV/50 k Ω at 0 dB
Headphones :  40 mV/ 98 Ω at 0 dB
Power Source:  110, 220, 240 V 50/60 Hz  AC
Power Consumption:  25 W (at 220 V)
Dimensions (W x H x D):  430 x 95 x 320 mm
Weight :  5,9 kg
Remote Control :  Yes

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