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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-7R cassette deck

Auto-Reverse Playback/Recording Cassette Deck

The CT-7R records and plays back both sides of a tape, automatically. Now you can record up to 90 minutes of music (with C-90 cassette) without interruption and play it back over and over as long as you like. This may be a rare feature but what's even rarer is that the CT-7R is direct-drive.

As in the more expensive models, the transport in the CT-7R uses three-direct-drive-motor, each a Pioneer brushless Hall type. This contributes to the low wow and flutter of this deck, 0,04% (WRMS) or less.

The recording/playback head is constructed of Pioneer-developed Ribbon Sendust that is three to four times thinner than those used in conventional sendust heads. This explains the extended high frequency response of this deck - to 20,000 Hz. Transient response is superior and bass response is solid. The :Small-Window" Erase Head assures total erasure of previous recordings.

And like the more expensive models, the CT-7R is endowed with a full complement of Computer-Aided Conveniences. It's easy to find the end of recorded program material on a tape, cue in on any desired selection, return to the very beginning of the start of the next selection, hear the same selection over and over again, and skip the blank, programless section at the end of the tape and start play right at the beginning of the first selection of the flip side - without even touching the operating controls.

A 4-bit microcompuer, programmed to order, controls every operation for sure and quick tape transport motion. The three-direct-drive-motor tape transport means operational ease such as fast direct change of modes and flying-start recording.

In addition to standard Dolby-B noise reduction, the CT-7R has Dolby Labs newest circuit, Dolby-C. the Dolby-C provides an additional 10 dB of noise reduction (at 5 kHz) over standard Dolby-B's. that's a total of 20 dB of noise reduction. It also has increased MOL (Maximum Output Level) to assure an extended high end.

The Auto Tape Selector detects coded recesses along the edge of each cassette casing and automatically sets the deck to the proper bias and equalization settings. An 8-LED bar-graph display )one per channel) is accurate and responsive. Other features are; One-Touch Recording, Recording Mute, Timer-assisted record/playback, wired remote control and two-way Memory Stop.

 


 Subfunctions:

Auto-reverse, auto repeat functions

MS/SKIP (Music Search/Skip) system

Music Repeat system

Blank Search system

Index Scan system

Rec Mute switch

Dolby NR system (B type/ C type / OFF) with LED indicator lamp

Stand-by mechanism with unattended recording and playback

3 position Auto tape selector (Norm/CrO₂/Metal)

Full automatic stop mechanism

Memory Stop function (FF, REW)

2 color digital level meter

3 digit mechanical tape counter

IC-based logic control

Cassette compartment illumination

 


Specifications

Systems:  Compact cassette, 2-channel stereo

Motor: 

1 x DC servo motor (for driving the capstan); 2 x DC high-torque motor (for driving the reel)

Heads: 1 x "Ribbon Sendust" record/playback head; 1 x Erasing Ferrite head

Fast Winding Time:  approx.. 90 sec C-60 tape

Wow and Flutter:  no more than 0,04% (WRMS). No More than 0,15% (DIN)

Frequency Response -20 dB Recording

Normal, LH Tape :  20 - 16,000 Hz (25 to 14,000 Hz ±3 dB)

CrO₂ Tape :  20 - 18,000 Hz (25 to 16,000 Hz ±3 dB) [0 dB rec; 25 to 10,000 Hz]

Metal Tape :  20 - 20,000 Hz (25 to 17,500 Hz ±3 dB) [0 dB rec; 25 to 15,000 Hz]

Signal-to-Noise Ratio

Dolby NR Off :  more than 59 dB

Dolby NR On :  more than 69 dB (Dolby-B); more than 79 dB (Dolby-C)

Total Harmonic Distortion:  no more than 1,2% (0 dB)

Input Sensitivity/max. Allowable Input/impedance

Mic (L, R) :  0,3 mV/ 30 mV/ 12 k Ω  (ref. MIC Impedance: 250 Ω  to 10 K Ω )

Line (input) :  50 mV/ 25 v/ 100 K Ω  (ref. Level/Load Impedance)

Output Level/ Impedance

Line (x2) :  450 mV/50 k Ω

Headphones :  60 mV/ 8 Ω 

Power Supply:  AC 120 V, 220 - 240 V 50/60 Hz

Power Consumption:  36-45 watts

Dimensions (W x H x D):  420 x 99,5 x 270 mm (16-9/16" x 3-15/16" x 10-5/8")

Weight:  5,3 kg (12 lb)


 

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