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





Sony TC-K 35 cassette deck

 

Top performance cassette deck

The Sony TC-K35 stereo cassette deck combines convenience and high performance at a surprisingly affordable price. As heir to Sony's many-years of excellence in tape recording, the K35 offers superior magnetic, mechanical and electronic technology. The end result is reliability and accurate reproduction of musical sound.

 

Ferrite0and-Ferrite head

The K35 incorporates Sony's exclusive ferrite-and Ferrite record/play head. Because ferrite is extremely hard, it provides exceptionally long service life - up to 200 times longer than permalloy. In addition, ferrite's hardness allows mirror-smooth polishing for low wear better tape-to-head contact, and better sound. And ferrite's superior magnetic permeability at high frequencies contributes to the extended high frequency response of the TC-K35

 

Low-Distortion Electronics

Sony's attention to detail extends to the electronic design, as well. The critical head/playback amplifier for example, uses a unique, patented, direct-coupled, design to insure low distortion. As you would expect, the K35 also incorporates the Dolby noise reduction system, providing Signal-to-Noise Ratio improvement of up to 10 dB at 5 kHz and above. And a built-in 19 kHz filter prevents Dolby circuit mistracking when you record FM stereo broadcasts.

 


DC Servo Tape Drive

The motor of the TC-K35 is a Sony Tri-Duty DC Servo Motor  with an internal frequency generator. As the motor turns, the generator produces a frequency proportional to the motor's speed. In this way, the generator reports any speed variation to the servo-control electronics which provide instantaneous correction. This, along with a dynamically balanced oversized flywheel, assures smooth, stable tape travel, with wow and flutter of only 0,05% (WRMS). And the unique aluminum, steel and rubber motor housing helps maintain this accuracy under a wide variety of temperature and load conditions.

 

Rugged, Flexible Transport

The K35's Sony-built transport provides particular benefits. First, the special "Auto-Play" feature allows you to rewind to the beginning of the tape and automatically transfer to the playback mode. Second, you can "punch in" directly from the play mode into the record mode, simply by pressing the record button. This allows additions to pre-recorded material. Next, REC Mute deletes unwanted program material as you record, and inserts periods of silence between pieces of music at the press of a button. Finally, at the end of tape, an all-mode auto stop system disengages the heads, pinch roller and capstan. This, together with a special safety-load mechanism, helps preserve tape and transport system from unnecessary friction and wear.

 

Precise Controls, Convenient Features

In addition, the layout and design of the K35 afford easy, accurate control. Separate, three-position bias and equalization controls optimize the deck for normal, ferrichrome, chromium dioxide (or chrome-equivalent) tapes. Dual-concentric controls provide quick adjustment of record levels and channel balance. Levels are displayed large meters, accurately calibrated from -20 to +5 VU. Musical transients too fast for detection by the meters are clearly indicated on the "peak" LED

 


Specifications

Tape Format:  Compact Cassette 4-track, 2-channel stereo record/playback

Drive System:  belt-drive motor system

Tape Speed:  4,75 cm/sec (1-7/8 ips)

FF & Rewind Time:  90 sec. (C-60)

Wow and Flutter:  0,05% (WRMS); 0,14% (DIN 45507)

Frequency Response (re: -20 dB record level)

FeCr Tape :  30 - 15,000 Hz  ±3 dB

EHF Tape :  30 - 15,000 Hz ±3 dB

SHF Tape :  30 - 13,000 Hz ±3 dB

Signal-to-Noise Ratio (Dolby off, re: 3% T.H.D.)

FeCr Tape :  58 dB (Peak, IHF-A, WTD)

EHF Tape : 56 dB (Peak, IHF-A, WTD)

SHF Tape :  52 dB (Peak, IHF-A, WTD)

Signal-to-Noise Ratio (Dolby on):  improved up to 5 dB at 1 kHz, 10 dB at 5 kHz or above

Total Harmonic Distortion (re: 0 dB record level):  less than 1,3% (feCr at 1 kHz)

Crosstalk (tracks)  60 dB at 1 kHz

Separation (channels) 35 dB at 1 kHz

Erasure:  60 dB at 400 Hz (FeCr)

Bias Frequency: 105 kHz

Meter Type & range:  VU ballistic with 1 peak LED -20 to +5 dB

Input Sensitivity/Impedance:

Line :  77,5 mV/ 50 k

Mic :  0,25 mV/1

Output Level/Impedance:

Line (fixed) :  0,435 V/ 50  k  (nominal) 10 k  (minimum)

Headphone :  38,8 mV/8   (nominal)

Power Requirements:  AC 110, 120, 220 or 240 V, 50/60 Hz

Power Consumption:  10 watts max

Dimensions (W x H x D):  430 x 130 x 290 mm (17" x 5-1/8" x 11-1/2")

Weight:  5,8 kg (12 lb 13 oz)

Sony TC K-88 cassette deck


Cassette deck TC-K88 Slim line

Slim line units using unique auto-slidenfront loading system

33 segment fast reacting LCD peak metering system

3 motors and direct drive crystal locked capstan drive system ensuring excellent speed stability and reliability.

Separate 4-position bias and equalization switches allowing the use of the new high performance metal tape.

S & F head

Optional remote control (RM 50)

AMS facility 


 

 


Specifications

Recording System:  4-track, 2 -channel stereo

Fast-Forward/Rewind Time:  approx. 60 sec. (with C-60)

Motor:  3 D.D BSL & Slide motor

Heads:  1 x S&F for Rec and Power Bandwidth; 1 x erase head

Signal-to-Noise Ratio

Dolby NR Off

Type III Cassette (Sony FeCr) :  60 dB at peak level (NAB)

Type II Cassette (Sony CD-α) :  58 dB at peak level (NAB)

Dolby NR On

Improved by 5 dB at 1 kHz, 10 dB above 5 kHz

Total Harmonic Distortion:  0,9% (with Fe Capture Ratio cassette)

Frequency Response

Dolby NR Off

Type IV cassette (Sony Metallic)

20 - 19,000 Hz

30 - 17,000 Hz (±3 dB)

30 - 13,000 Hz (±3 dB, 0 VU recording)

30 - 17,000 Hz (DIN)

Type III cassette (Sony FeCr)

20 - 19,000 Hz

30 - 17,000 Hz (±3 dB)

30 - 17,000 Hz (DIN)

Type II cassette (Sony CD-α)

20 - 18,000 Hz

30 - 16,000  Hz (±3 dB)

30 - 16,000 Hz (DIN)

Type I cassette (Sony BHF)

20 - 17,000 Hz

30 - 15,000 Hz (DIN)

Wow and Flutter:  0,03% WRMS (NAB) ±0,085 % (DIN)

Input Sensitivity/Impedance

Microphone :  0,25 mV(-70 dB) / low-impedance microphone

Line :  77,5 mV (-20 dB)/ 50 k

Output Level/Impedance

Line :  0,435 V (_5 dB)/ 50 k   (suitable load impedance more than 10 k )

Headphone :  -26 dB/ 8

Power Requirements:  110, 120, 220 or 240 V 50/60 Hz

Power Consumption:  45 W (35 W Canada and USA)

Dimensions (W x H x D):  480 x 80 x 385 mm (19" x 3-1/4" x 15-1/4") with rack mounting handles

Weight:  10 kg (22 lb 1 oz) with rack mounting handles

Denon TU-750 tuner

FM/AM Stereo Tuner

 

Fully Electronic Digital Synthesizer Ensures Best Tuning

The digital synthesizer enables optimum tuning in accordance with the frequency of different FM/AM (LW) stations in increments of 50 kHz for FM reception and 9 kHz for AM reception.

This system servo-controls the veractor diode by comparing the frequency received with an accurate reference frequency obtained by a crystal oscillator, and thereby cuts frequency drift and ensures stable reception.

 

Automatic Accurate Tuning

Set the Scanning key to Auto and push the Up (for Down) tuning key, and the higher (or lower) frequency radio wave is automatically searched for the correct tuning point. Depressing the tuning key again causes the adjacent station to be pinpointed.

 

One-Touch Precise Tuning to Any of 14 Stations

Once the desired station is selected, it can be stored in memory merely by pushing the Memory key and the associated Preset key (1-7). Thus, up to 14 stations (FM/AM) can be stored in memory. Depressing the desired Preset key pinpoints the station selected.

 

Sophisticated Circuit Configuration

At the front end, a 4-stage varactor diode comparable to a 4-gang variable capacitor and an MOS FET are used to form a solid input circuit, attaining high sensitivity and outstanding Signal-to-Noise Ratio. At the same time, image interference is appreciably removed. The intermediate frequency amplifier stage, which largely determines the total sound quality, employs a linear-phase ceramic filter featuring both low distortion and high selectivity, thereby improving the overall distortion throughout the band.

The detector circuit employs a quadrature detector IC having linear detection capability in a wide band. Also, the MPX circuit for FM detector uses a newly developed PLL-MPX IC boasting low distortion and high Signal-to-Noise Ratio, providing excellent stereo separation.

 

DC Configuration Amplifier for Audio Circuit up to Output Stage.

To transmit high-quality, distortion-free musical signals, a DC configuration amplifier eliminating the coupling capacitor is used to obtain optimum frequency characteristics.

 


Specifications

FM Section

Tuning Frequency Range:  87,5 - 108 MHz

Usable Sensitivity:  1,8 µV (10,2 dBf, 300 )

Effective Selectivity:  80 dB (±400 kHz)

Signal-to-Noise Ratio (50 dB Sensitivity)

Stereo :  31,6 µV (35,2 dBf)

Mono :  3,0 µV (14,2 dBf)

Total Harmonic Distortion

Stereo :  0,08% (90% mod.)

Mono :  0,06% (100% mod.)

Capture Ratio: 1,0 dB

AM Suppression:  60 dB

Image Rejection:  50 dB

IF Rejection:  65 dB

Frequency Response:  20 Hz - 15 kHz +0,2 dB -1,5 dB

Stereo Separation:  55 dB (1 kHz)

AM Section

Tuning Frequency Range:  530 - 1620 kHz (USA); 622 - 1611 kHz (EU)

Usable Sensitivity:  18 µV

Total Harmonic Distortion:  0,6%

Signal-to-Noise Ratio:  50 dB

LW Section
tuning Frequency Range:  140 - 353 kHz

Usable Sensitivity:  40 µV

Effective Selectivity:  50 dB

Signal-to-Noise Ratio:  50 dB

General

Power Requirements:  AC 120V 60 Hz, or AC 220/240V 50/60 Hz

Power Consumption:  6 W

Dimensions (W x H x D):  434 x 66 x 300 mm

Weight:  3,1 kg

Denon TU-710 tuner

FM/AM/LW Stereo Tuner

Precise and easy tuning, Denon's LED tuning lights improve accuracy

A 2-color LED indicator lights up in red first, and then changes into green optimum tuning is achieved.

Adoption of a superior low noise FET at front-end achieving high sensitivity and S/Nratio

A linear phase ceramic filter is utilized to establish both high selectivity and low distortion at the intermediate frequency amplification stage. A linear quadrature detector IC is used, encompassing a very wide frequency range. Superior separation has been achieved by the PLL-MPX IC with low distortion and high Signal-to-Noise Ratio characteristics in the stereo demodulation section

Adoption of the electronic switch for FM and AM change-over enables to prevent sound quality deterioration by reciprocal signal interference.

A low impedance loop antenna with compact size is used for AM broadcast reception. It features good electric field noise characteristics, free to detach from rear panel and able to set up better receiving location

Smooth travel of the dial indicator is achieved by the application of newly developed fly-wheel which greatly improved dial  and backlash.

 


Specifications

FM Section

Tuning Frequency Range:  87,5 - 108 MHz

Usable Sensitivity:  0,9 µV (10,3 dBf, 75 )

Effective Selectivity:  70 dB (±400 kHz)

Signal-to-Noise Ratio (50 dB Sensitivity)

Stereo :  15,8 µV (35,2 dBf)

Mono :  1,5 µV (14,2 dBf)

Total Harmonic Distortion

Stereo :  0,3% (67,5 kHz dev)

Mono :  0,2% (75 kHz dev)

Capture Ratio: 1,0 dB

AM Suppression:  55 dB

Image Rejection:  50 dB

IF Rejection:  65 dB

Frequency Response:  20 Hz - 15 kHz +0,2 dB -1,5 dB

Stereo Separation:  40 dB (1 kHz)

AM Section

Tuning Frequency Range:  525 - 1605 kHz

Usable Sensitivity:  15 µV

T.H.D.  0,4%

Signal-to-Noise Ratio:  50 dB

LW Section
tuning Frequency Range:  150 - 350 kHz

Usable Sensitivity:  40 µV

Effective Selectivity:  40 dB

Signal-to-Noise Ratio:  50 dB

General

Power Requirements:  AC 120V 60 Hz, or AC 220/240V 50/60 Hz

Power Consumption:  7 W

Dimensions (W x H x D):  434 x 66 x 300 mm

Weight:  3,3 kg