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

Pioneer CT-F 9191

The recording tape in a cassette is only an eight of an inch may be as many as 64 original tracks mixed down to two. A hundred musicians. Countless overdubbings. Not to menttion the entire audible frequency range.
Any cassette deck can reproduce part of what's been put down on that eighth of an inch.
The Pioneer 9191 was designed to reproduce all of it. Superlatively. Without dropouts, unacceptable tape hiss, or noticeable wow and flutter. 

Take our tape transport system.
Since the tape in a cassette moves at only 1-7/8 inches per second, even the most minuscule variation in tape speed will make a major variation in sound. To quard against this, where most cassette decks give you one motor, the 9191 comes with two. The first is used only for fast forward and rewind, so the second can be designed exclusively for maintaining a constant speed for paly and record.
All of our tape drive components - the capstan, belt, and flywheel - are finished to incredible tolerances. Which give the 9191 the kind of wow and flutter figures that no deck in our price range can match.
of course, having a great tape transport system means nothing if you don't have great electronics to back it up. We do.

The 9191 comes with an advanced three stage direct coupled amplifier that extends high frequency response and minimizes distortion. The built-in Dolby system can reduce tape hiss by as much as 10 decibels in high frequencies. Our multiplex filter lets you record FM broadcasts without picking up a lot of unwanted noise, or the multiplex signal every FM stereo station sends out.
Even our ferrite solid tape head offers the best combination of accuracy and long life you can get in a cassette head.

There's also a peak limiter that lets you cram as much pnto a cassette as possible without distortion. large VU meters ans a peak indicator light taht let you know if you do begin to oversaturate bias and equalization switches that let you get the most out of different brands of tape.
 And an automatic CrO2 selector. if all this isn't enough, you'll find that the 9191 comes with memory that lets you go back to a favorite spot on the tape automatically. And electronic solenoid controls for going from play to rewind, or from rewind to fast forward, without hitting the stop button. And without jamming the tape.
There's also the convenience of front loading. A door over the cassette compartment to help keep the tape heads clean. And a light behind the cassette that lets you see where you are on the tape.

Systems:  Compact cassette, 2-channel stereo
Motor:  Electronically-controlled DC motor (built-in generator) x1; (4,8 cm/s speed drive)
DC torque motor x1 (Fast forward and rewind drive)
heads:  One Ferrite Solid recording/playback head; One Ferrite erasing head
Operation:  Solenoid drive, direct switchable and timer play presettable
Fast Winding Time:  Approx. 65 seconds (C-60 tape)
Wow and Flutter:  No more than 0,07% WRMS
Frequency Response:
Standard, LH tapes : 20 - 16,000 Hz (30 - 13,000 Hz ±3 dB)
CrO₂ dioxide tape:  20 - 17,000 Hz (30 - 15,000 Hz ±3 dB)
Signal-to-Noise Ratio: 
Dolby OFF : More than 53 dB
Dolby ON : More than 63 dB (over 5 kHz, standard, LH tape)
(When chromium dioxide tape is used, S/N ratio is further improved by 4,5 dB over 5 kHz)
Harmonic Distortion:  No more than 1,5% (0 dB)
Inputs (Sensitivity/Max. allowable input/Impedance):
Mic x 2 : 0,22 mV/100mV/30 kΩ, 6 mm jack (reference Mic impedance: 600Ω to 30 kΩ)
Line x 4 (2-channel stereo, Parallel connection system) : 65 mV.25 V/100 kΩ
Rec/Pb x 1 : Input & output, 5 p jack (DIN standard)
Outputs (Reference level/Max. level/Load impedance):
Line x 4 : 315 mV/530 mV/50 kΩ (2-channel stereo, parellel connection system)
Headphone x 1 : 40 mV/65 mV/ 8 Ω
With output level controls
Amplifier Section:  75 Transistors (including 6 x FETs ); 86 Diodes (including 5 x Zener Diodes and 2 x LED)
Motor control Section : 3 x Transistors; 2 x Diodes
Dolby system (On-Off) with indicator lamp;
MPX Filter (On-Off)
Tape Selector (STD/CrO₂) with indicator lamps
Automatic tape selector for CrO₂ tape, and Manual tape selector of independently BIAS/EQ (Ferri-chrome tape available)
Cassette compartment illumination
Mixing control used for Mic and Line input
Tape counter with rewind memory switch (On/Off) for starting point [Rew-Stop/Play (REC)]
Recording limiter (-40 dB to +5 dB)
Recording peak level indicator (Lightable level; +5 dB)
Level Memory Marker for inputs and output
Power requirements:  AC 220 V or AC 110, 120, 130, 220, 240 V (switchable) 50/60 Hz
Power Consumption:  53 watts
Dimensions (W x H x D):  457 x 197 x 315 mm (17 x 7 x 12 inch)
Weight:  13,2 kg (29 lbs) net

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