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





Onkyo TA-630D

 Stereo Cassette Tape Deck
A full-feature front loading cassette deck with phase-locked loop (PLL) servo DC motor drive system and unique "Accu-Bias" control for complete tape compatibility. Equipped with a newly developed hyperbolic S&S sendust rec/pb head, Dolby NR with MPX filter, memory rewind full auto stop mechanism, timer start/pause function, rec-mute switch and large VU meter with two peak level indicators.

Accu-Bias is Onkyo's exclusive system. It works with a pair of reference signal generators built into the TA-630D. Feed these signals to your tape, and read the reproduction signal on the meters. If bias is off for that cassette tape, you compensate with continuous variable settings until you get an absolutely flat frequency response. It's that simple, and you get the best high frequency response, least distortion and lowest signal to noise ratio.
 High Quality Long Life "S&S" Sandust Head
Onkyo's recently developed "S&S" Sedust head (made from a highy robust silicon/iron/aluminum alloy of outstanding magnetic properties) plays a very big role in achieving the high quality of sound reproduction in the TA-630D. Extended frequency response 920 Hz - 18,000 Hz with chrome tapes) and an exceptionally wide dynamic range make your recordings sound professional-like.

Other important features:
Dolby NR System with Switchable MPX Filter
Built-in Dolby FM Decoder
Timer Switch for Automatic recording or monitoring Alarm
One-Touch Rec Muting for Clean Editing
Memory rewind for Rapid replay
Separate 3-Way Bias and Equalization Selectors
Full Auto-Stop mechanism
Specifications
Track Format:  4-track, 2-channel
Erase System: AC erase
Tape Speed:  4,8 cm/sec
Wow and Flutter:  0,048% (WRMS)
Fast Forward and Rewind Time:  90 sec (C-60)
Frequency Response:
Normal Tape :  30 -15,000 Hz
CrO₂ Tape :  30 -18,000 Hz
FeCr Tape :  30 - 18,000 Hz
Signal-to-Noise Ratio:  68 dB (FeCr tape, Dolby NR in, Dolby level)
Transistors:  40
SCR:  1
IC:  4
Diodes:  25 diodes, 3 LED
Input Terminals:
Microphone jacks : 2
Minimum Input level :  0,3 mV
Input Impedance : 50 k Ω
Optimum Mic Impedance:  200 Ω - 50 k Ω
Line in Jacks : 2
Minimum Input level :   50 mV
Input Impedance :  50  k Ω
DIN Jacks : 1
Minimum Input Level :  0,1 mV/k Ω
Input Impedance :  5 k Ω
Output Jacks
Line Out jacks :  2
Standard Output level :  0,775 V (0 VU)
Optimum Load Impedance:  over 50 k Ω
DIN Jack: 1
Standard Output Level :  0,775 V (0 VU)
Optimum Load Impedance :  over 50 k Ω
Headphones :  8 Ω - 200 Ω
Motor:  PLL Servo DC
Power Supply:  AC 120 V, 60 Hz (for USA and Canada)
AC 110/120/220/240 V, 50/60 Hz or 240 V, 50 Hz  ( for other countries)
Power Consumption:  13 W
Dimensions (W x H x D):  418 x 158 x 297 mm (16-1/2" x 6-1/4" x 12"
Weight:  6 kg (13,2 lbs)


Onkyo TA-2010


Stereo cassette tape Deck
The most affordable way to enjoy high fidelity cassette recording and playback with all-tape compatibility. Featuring Onkyo's own :Accu-Bias" adjust control, long-life superb permalloy Widex rec/pb head, Dolby NR with MPX filter, Dolby referenced VU meters, separate 3-position bias/EQ tape selectors, end-of-tape shut off and pause/edit control.

Specifications:
Track System:  4-track, 2-channel stereo
Recording System:  AC bias
Erasing System:  AC erase
Tape Speed:  4,8 cm/sec
Wow and Flutter:  0,08% (WRMS)
Frequency Response:
Normal Tape :  20 - 14,000 Hz
FeCr Tape :  20 - 16,000 Hz
High Tape :  20 - 16,000 Hz
Signal-to-Noise Ratio:   54 dB (Dolby NR Out, FeCr tape)
A nooise reduction of 10 dB above 5 kHz and 5 dB at 1 kHz is possible with the Dolby NR in.
Input Jacks:
Microphone Jacks :  2
Minimum Input Level/Impedance:  0,3 mV/5 k Ω
Optimum Mic Impedance :  200 Ω - 50 k Ω
Line In Jacks : 22
Minimum Input Level/Impedance :  50 mV/50 k Ω
Outputs
Line : 2
Output Level :  0,480 V ( at 0 VU)
Impedance :  over 50 k Ω
Headphone :  1
Impedance :  8 Ω / 200 Ω
Motor :  DC servo-motor
Heads:  Hard Permalloy Heads
Mechanism Specifications
Tape Speed: 4,8 cm/sec (3 kHz =3%, -2%)
Wow and Flutter:  less than 0,08% (WRMS)
Take-up Torque:  35 - 70 gr-cm
F.F. Torque:  55-130 gr-cm
Rwind Torque:  55-130 gr-cm
Automatic Shut-Off Time:  less than 5 sec
Components:  15 Transistors; 11 Diodes;  2 IC; 3 LED
Power Supply:  AC 120 V 60 Hz ( U.S.A. model) or AC 110/120/220/240 V 50/60 Hz
Power Consumption:  8,5 W
Dimensions (W x H x D):  418 x 150 x 250 mm (16-7/16" x 5-5/16" x 9-13/16")
Weight:  4,8 kg  (10,6 lbs)

Kenwood KR-950B

Kenwood KR-950
Quartz Synthesizer Hi-Speed DC Receiver
Features:
Front panel MM/MC cartridge selection
Two-way tape dubbing LED power meters
Quartz PLL frequency synthesized tuner
Automatic seek tuning with High and Low sensitivity selector
6 FM and 6 AM memory presets

Specifications:
Audio Sections
Power Output:  80 W/ch min. RMS, both channels driven into 8 ohms, 20 Hz to 20 kHz with no more than 0,015% THD
Both Channels Driven ( into 8 Ω at 1 kHz):  85 W + 85 W
Dynamic Power Output (at 4 Ω):  250 W
Total Harmonic Distortion (20 Hz -20 kHz from Aux):
Rated power into 8 Ω :  0,015%
1 watt power into 8 Ω :  0,01%
Intermodulation Distortion (60 Hz :7 kHz = 4:1 SMPTE):
Rated power into 8 Ω :  0,01%
Damping Factor:  40 at 1 kHz, 8 Ω
Transist Response:
Rise Time :  2 µs
Slew Rate :  ±50 V/µs
Input Sensitivity/Impedance:
Phono MM :  2,5 mv/ 50 k Ω
Phono MC :  0,25 mv/100 Ω
Tuner,Aux,Tape Play :  150 mV/50 k Ω
Signal-to-Noise Ratio (A weighted):
Phono MM :  86 dB for 2,5 mV input
Phono MM :  92 dB for 5,0 mV input
Phono MC :  68 dB for 0,25 mV input
Tuner,Aux,Tape Play :  104 dB for 105 mV input
Phono Max. Input Level (at 1 kHz):
MM :  200 mV (RMS), THD0,01%
MC :  30 mV (RMS), THD0,1%
Frequency Response:
Phono RIAA Standard  Curve:  20 Hz to 20 kHz ±0,3 dB
Over All (Aux ->Spkr.):  DC Hz to 160 kHz +0 dB, -3 dB
Tone Control:
Bass :  ±8 dB at 100 Hz
Treble :  ±8 dB at 10 kHz
Filter:
Low :  6 dB/oct at 18 Hz
High :  6 dB/oct at 5 kHz
Loudness Control (Vol -30 dB):  +10 dB at 100 Hz
Output Level/Impedance:
Tape Rec Out (PIN):  150 mV/ 1 k Ω
FM Tuner Section
Usable Sensitivity:  10,8 dBf (1,9 µV)
50 dB Quieting Sensitivity:
Mono :  14,2 dBf (2,8 µV)
Stereo :  36,8 dBf (38 µV)
Signal-to-Noise Ratio at 65 dBf:
Mono :  80 dB
Stereo :  74 dB
Total Harmonic Distortion at 1 kHz:
Mono :  0,07%
Stereo :  0,08%
Frequency Response:  30 Hz to 15 kHz +0,5 dB -2 dB
Image rejection Ratio:  80 dB
Spurious Response ratio:  95 dB
IF Response Ratio:  95 dB
Alternate Channel Selectivity:  60 dB at ±400 kHz
AM Suppression Ratio:  60 dB
Stereo Separation:  50 dB at 1 kHz; 40 dB at 50 Hz to 10 kHz
Antenna Impedance: 
Balanced :  300 Ω
Unbalanced :  75 Ω
FM Frequency Range:  87,5 MHz - 108 MHz
AM Tuner Section
Usable Sensitivity:  10 µV (400 µV/m)
Signal-to-Noise Ratio:  48 dB
Image Rejection Ratio:  40 dB
Selectivity:  25 dB
General:
Power Consumption:  65 W (no signal); 3,5 A (UL and CSA); 450 W (IEC); 450 W (others)
AC Outlet:  Switched2, Unswitched 1
Dimensions (W x H x D):  480 x 142 x 350 mm (18-29/32" x 5-19/32" x 13-25/32")
Weight:  9,0 kg (19,8 lb) net

Kenwood KR-930

Kenwood KR-930
Quartz Synthesizer Hi-Speed Receiver
Features:
Quartz PLL frequency-synthesized tuner
Automatic seek and manual tuning
6 FM + 6 AM memory presets
Two tape monitors and dubbing B to A
LED power meters
60 W/ch min. RMS, both channels driven, 8 ohms, 20 Hz to 20 kHz with no more than 0,03% Total Harmonic Distortion
FM Signal-to-Noise ratio 78 dB mono
FM Total Harmonic Distortion 0,08% mono ( 1 kHz)
Dimensions (W x H x D): 18-29/32" x 5-1/14" x 11-5/8"

Weight:  15,0 lbs