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-7070H/HB

 Optonica RT-7070H/HB
Double Recording /Playback Stereo Cassette Tape-Deck with Dual Dolby and APSS
To conquer the performance problems of conventional cassette deck, Optonica divided the functions of a deck into recording and playback systems and created the RT-7070H/HB. Two independent transport systems driven by separate FG servo DC motors are incorporated, each with its own compartment and amplifier. The separate transport used only for recording features a wide-gap Sendust-and Sendust recording head that provides high recording sensitivity, good linear response and wide dynamic range. The 2-stage direct-couped NPN/PNP amp for the recording section offers high saturation, extreme linearity and wide dynamic range. The playback section is equipped with an ultra-narrow-gap Sendust-and-Sendust playback head that results in an absolute minimum of gap signal loss while optimizing frequency response across the frequency range. This section has a 3-stage ICL amplifier with state-of-the-art FET circuitry that eliminates the need for distortion-causing coupling capacitors. Dubbing can be performed with none of the loss in quality usually associated with cables and hook-up jacks. Each compartment has its own Dolby Noise Reduction system.
The RT-7070H/HB is equipped with APSS for one-touch skipping or repetition of desired selections, a record-mute button for one-touch editing, a 4-position tape selector to provide the correct settings for metal, CrO₂, FeCr and normal tapes. Digital meters display accurate input levels and have a peak hold function.
 Transport for recording/erase and playback are driven by separate FG servo DC motors to ensure stable motor speed.
Since each section performs only its assigned functions, the tape-heads could be aligned with the transport system for optimum tape alignment.
A wide-gap Sendust-and-Sendust head to assure high recording sensitivity is used for recording, while a double-gap head is provided for erasing to guarantee clean response.
For the playback section, an ultra-narrow-gap Sendust-and-Sendust head keeps gap signal loss to a minimum and optimizes frequency response.
The two perfectly matched tape compartments allow high quality dubbing for Tape 1 to Tape 2, while the three-mode level control function facilitates dubbing.
Dolby Noise Reduction vircuitry is provided for each tape compartment to reduce tape hiss. 
The MPX filter can be used to ensure optimum FM Dolby recordings.
APSS permits playback of desired selections at the touch of a button.
Metal tape capability allows you to makes use of the greatly extended frequency response, increased dynamic range and lower distortion of metal tapes.
Mechanical Section
Capstan Drive : FG servo DC-motor (Tape 1)
Reel Drive : FG servo DC-motor (Tape 2)
Record/Playback : Narrow-gap Sendust head (for playback - Tape 1)
Erase : Double-gap Ferrite head (for erese – Tape 2)
Others : Wide-gap Sendust head (for recording & monitor)
Wow and Flutter:
DIN (45 500) : ±0,15%
WRMS : ±1,0%
Tape Speed Deviation: ±1,0%
FF/RW Time: 110 sec (C-60)
Audio Section
Frequency Response:
Normal Position : 20 – 16,000 Hz (DIN 45 500); 30- 16,000 Hz ±3 dB
CrO₂ Position : 20 – 18,000 Hz (DIN 45 500); 30 – 18,000 Hz ±3 dB
Fe-Cr Position : 20 – 19,000 Hz (DIN 45 500), 30 – 19,000 Hz ±3 dB
Metal Position : 20 – 20,000 Hz (DIN 45 500), 30 – 20,000 Hz ±3 dB
Signal-to-Noise Ratio (Fe-Cr Tape):
Dolby NR Off : 57 dB
Dolby NR On : 67 dB at over 5 kHz
Recording Sytem: AC bias (105 kHz)
Erase System: AC erase (105 kHz)
Input Sensitivity/Impedance:
Line -In : 50 mV/50 k Ω
Rec/Pb (DIN) : 1 mV/ k Ω
Output Level/Impedance:
Line-Out : 1,000 mV/50 k Ω at 0 dB
Rec/Pb (DIN) : 1,000 mV/50 k Ω  at 0 dB
Headphones : 125 mV/ 8 Ω   at 0 dB
Power Source: 110/220/240 V 50/60 Hz AC
Power Consumption: 20 W (220 V)
Dimensions (W x H x D): 430 x 114 x 321 mm
Weight: 7,5 kg
Colour Front Panel:
Silver : RT-7070H
Brown : RT-7070HB

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