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





Micro Seiki DD-5E

Micro Seiki direct drive turntable  model DD-5E

Specifications:
Turntable Section
Drive System:  Direct Drive with DC servo motor
Rotation:  33-1/3 and 45 rpm
Speed Fine Adjustment Range:  ±6% of rated speed (half a musical Pitch)
Platter:  diecast aluminium
Diameter :  310 mm
Weight :  1,5 kg
Wow and Flutter:  less than 0,03%
Signal-to-Noise Ratio:  more than 60 dB
Tonearm Section
Type:  Static Balance
Effective Length:  222 mm
Overhang:  15 mm
Offset Angle:  21°
Max. Tracking Error: less than 1,5
Acceptable Carteidge Weight:  4 - 10,5 grams
Power Requirement:  110, 117, 220, 240 V 50/60 Hz
Power Consumption :  5,4 W
Dimensions (W x H x D):  466 x 142 x 342 mm (18-3/8" x 5-5/8" x 13-1/2")
Weight:  8,2 kg (18,0 lbs)

Sansui SC-737


Sansui SC-737
Dolby System Stereo Cassette Deck with M-C ferrite Head
Sansui feels so confident about the quality of this unusually fine cassette deck that we invite you to compare its performance and sound with that of any open-reel deck, even one of our own. That's a bold statement, particularly from a company known for its extreme concern for both the electronic specifications and actual tonal characteristics of its audio products.
To back it up; the SC-737 delivers a frequency response of 35 to 24,000 Hz ±3 dB; the built-in Dolby Type-B noise reductionreduction system allows noise reduction effect of more than 8 dB, the newly designed tape transport mechanism provides a wow and flutter factor of less than 0,11%. One of the first things you'll notice is the unusual size of the SC-737.  this allows sufficient space for the newly developed cassette tape transort mechanism of open-reel-performance quality, the advanced Dolby and all the sophisticated solid-state circuitry designed specifcally for this deck.

Feather-touch keyboard controls resist damage and wear. A built-in lock prevents accidental switching of mode. An automatic electro-optical shut-off device protects tape and moving parts. Hysteresis synchronous reel and capstan motor is unaffected by fluctuations in popwer. Sansui developed Magni-Crystal ferrite head with super-hard, mirror-like surface eliminates dropout and fluctuatio of high frequency signals.  And here's  a unique  feature: a third microphone input with separate recording level control is provided for center mic mixing. Other professional extras include oversized VU meters and separate peak level indicator, an improved 19 kHz Multiplex FM filter for FM recording, "radar" tape travel indicator, tape selector  ( normal, LH/cro2), 3-digit tape counter, no-click pause button, switchable voltage/cycle for international use, headphone jack , DIN and RCA-type input/ output jacks and easy-to-clean, easy-to-use top panel displays and attractive wooden cabinet.

Features:
High-Density Magni-Crystal Ferrite Record/Play Head
Record-Playback Preamplifier
Photoelectric Sensor Shut-Off
Tape Selector Switch
Peak level Indicator and Professional VU Meters
Center-Channel Microphone Mixing
Tape Travel Radar Indicator
Cut-Core Transformer

Specifications
Track System:  4-track 2-channel record/playback
Tape Standard:  philips Cassette standard
Tape Speed:  4,8 cm/sec 91-7/8 ips)
Heads:  record/Playback head; Erase head (ferrite head)
Motor:  Hysteresis synchronous type
Tape Driving System:  belt driving system
Wow and Flutter:  within 0,11 (WRMS)
Tape Speed Accuracy:  within 75 sececonds (C-60)
Frequency Response (Rec/Pb):
Normal tape :  30 - 13,000 Hz (35 - 11,000 Hz ±3 dB)
Chromium Tape :  30 -16,000 Hz (35 - 14,000 Hz ±3 dB)
Signal-to-Noise Ratio: 
Chromium Tape (Dolby Out):  better than 50 dB (weighted)
Dolby Noise Reduction Effect :  better than 8 dB (above 5 kHz)
Channell Separation:  better than 38 dB 91 kHz)
Erasure Factor:  more than 60 dB (1 kHz)
Input Sensitivity/Impedance (0 VU, 1 kHz):
Mic (L. R.) :  0,5 mV/10 k Ω
Mic (center) :  0,5 mV/10 k Ω
Line :  70 mV/100 k Ω
DIN :  14 mV/30 k Ω
Output Level (0 VU, 1 kHz):
Line :  0,56 V
DIN :  0,56 V
Bias Frequency:  85 kHz Nominal
Indicators:  Tape Run, Dolby NR, Record, peak level
Power Voltage :  100,17, 220, 240 V 50/60 Hz
Power Consumption:  22 W (rated)
Semiconductors:  41 Transistors, 2 FETs, 2 Zener Diodes, 17 Diodes, 6 Varistors, 1 Cds Cell
Dimensions (W x H x D):  464 x 121 x 294 mm (18-1/2" x 4-3/4" x 11-3/26")
Weight:  8,1 kg (17,8 lbs ) net




Akai GXC-36D

Stereo Cassette Tape Deck

Cassette recordings that rival reel-to-reel performance - that's what Akai's new GXC-36D delivers. Made possible with Akai's exclusive GX (glass and cystal) Head. There's even an Over-Level Suppressor Switch to limit high recording level distortion. And other impressive features that include a Tape Selector Switch, Tape Run Lamp, Pause Control, Direct Function Change Control, and a 3-digit Counter.

Put it to the hearing test.
In our ever constant pursuance of more perfect sound reproduction, we invented the incomperable GX Head. The application of this extraordinary head to our superior enginered cassette machines results in the upgrading of cassette sound to professional rell-to-reel performance. With the GX Head focused-field recording system, high frequency signals can be recorded and played back with perfect clarity. Review the features and specifications of this new cassette deck and then "put it to the hearing test". We are confident that you will be delighted.

Specifications:
Track System:  4-track 2-channel stereo system
Motor:  Induction Type Motor
Tape Speed:  1-7/8 ips
Wow And Flutter:  less than 0,12% WRMS
Frequency Response: 
40 Hz to 17,000 Hz using chromium dioxide tape
40 Hz to 15,000 Hz using low noise tape
Signal-to-Noise Ratio:  better than 48 dB
Heads: 
One GX recording/playback head
One erase head
Fast Forward & Rewind Time:  within 65 seconds using a C-60 type cassette tape
Output Jacks:
Line :  0,78 V (0 dB); required load impedance :  more than 200 k Ω
Phone :  30 mVat 8 Ω
Input jack:
Microphone :  0,5 mV/ 4,7 k Ω
Line :  70 mV/200 k Ω
DIN Jack :  0,5V/30 mV (high)/ 3 mV (low)
Semi-conductors:  21 Transistors; 12 Diodes
Power Consumption:  20 W
Dimensions (W x H x D):  410 x 115 x 223 mm (16,1" x 4,6" x 8,8")
Weight:  5,3 kg (11,7 lbs)


Quad II Integrated Amplifier


The Quad II-Classic Integrated
The rekindled interest in 2 channel analogue hi-fi been remarkable to witness. The popularity of vinyl has grown steadily over the last years and now represents a significant proportion amongst real music enthusiasts. Quad has been at the forefront of this trend with its development of some of the world's most stunning amplifiers  loudspeakers and phono stages. Creating a compact audiophile integrated solution for LP and Vintage Hi-End Audio lovers while working in collaboration with one of the industry's edteemed legendry figures, Tim DeParavicini.

Through his contemporary designs based on Qad's novel amplifier technology developed over half a century ago for his invention of the first Quad II Mono Amplifier introduced in 1953, our classic range of amplifier and speaker componenets represent far more than a nostalgic trip down memory lane. Each product represents as significant a design statement as their original counterparts.

The new Quad II Classic Integrated  Amplifier is perfectly balanced and completely integrated amplifier system to resolve system matching and offer exceptional performance nd value within a relatively compact and classically styled chassis.

Performance as you would expect from one of the most famous names in hi-fi, is nothing short of breattaking. The 25 watt per channel specified, belies their power and ability to drive even the most difficult loads. The remarkable output transformer design is characterized through its speed, agility and ability to convey the genuine passion of live performnce.

Design and Engineering
The KT-66 output valves, in push-pull configuration are visually stunning, even when safely secured within the cage tht protects them. Each valve produces around 25 watts per channel output in "Pure ClassA" which allows a suebrbly refined sound that appropriately matches modern as well as contemporary loudspeakers.

The package had to retainn the retro look of it famous preamplifier predecessor with th epower amplifier and transformers blended into a modern compact look. It has an understated elegance which lies beneath its smooth curves and lustrous finish because it uses a circuit dating back over fifty years to the time when vacumm tubes ruled the electronics industry and peter Walker was considered by many to be the master of audiophile design.

All Quad products are expected to last a lifetime - even longer. Many Quad customers still derive immense pleasure listening to products built over fifty years ago. The new Quad II Classic Integrated Amplifier is no exception, and with periodic servicing and a caring hand, you can expect its performance to continue for decades to come.

The Quad II Classic Integrated Amplifier operates in Pure Pentode (Beam Tetrode) output with partial cathode loading, this being more linear than so called ultralinear. It is a pure Class A operation, whereas its push pull operation's efficiency can only rach 50% max and its power supply is the usual capacitor filter with diode bridge rectifier, AC 6,3 volts heaters to the valves that is shared between both channels.

Equipped with a bi polar transistor phono amplifier that uses 4 transistors per channel with low feedback to provide correct RIAA equalisation. Also has a gain switch for moving coil caartridges, 0,25 mV at 1 kHz , a circuit which operates from a regulated 36 V derived directly from th emain HT valve. It ensures a very high overload performance from rcords.

The phono circuit is housed in a shielded compartment providing low noise RF proofing within th emain package.

Amplification Process
The Quad II Classic Integrated Amplifier output is 25 watt per channel  Integrated Amplifier had to obey Peter Walker's Philosophy  of cathode loading of the output stage and simplicity of design.
Upon Input, a selector switch routes the required signal to the volume control then on the first of 3 small driver valves. This first valve is an ECC83 acting as a differential balance circuit that is a phase slitter.
The output going into a pair of ECC88 valves that both operate as a cascode circuit for high gain and wide bandwidth directly drives the output valves (KT 66) via capacitors.
The circuit had to have high gain than a normal power amplifier to offer a nominal 250 mV input sensitivity on the various inputs.
Push pull feedback is arranged from the cathodes of the output back to the ECC88 valves to provide low distortion and noise with consistent performance.

Specificastions
Stereo Power Output:  25 W per channel into 8 Ω
Total Harmonic Distortion:  0,06% (at 15W &700 kHz )
Signal-to-Noise ratio:  better than -95 dB (ref 25 W into 8 Ω)
Frequency Response:  20 Hz - 20 kHz +0 dB -0,5 dB
Crosstalk: better than 75 dB
Gain :  34 dB
Noise:  -98 dB (275 mV input)
Valve Type:  4 x KT66; 4 x ECC88; 2 x ECC83
Input Channel:  3 x Line Level; 1 x MM/MC Phono and Tape monitor
Dimensions (W x H x D):  200 x 310 x 380 mm