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

Kenwood KC-6060

 Solid State Audio-Lab Scope Kenwood KC-6060 - really find out what's gone wrong with your FM tuners and amplifiers. The KC-6060 is a fully-equipped, long-service-life professional instrument for highest quality testing.
Easy-to-see audio waveform is dispalyed on the 3-inch viewing area by 25 mV/cm (minimum) deflection sensitivity. Wave forms up to 200 kHz are perfectly visualized for diagnosis.
The handy, durable KC-6060 also has a buolt-in 1 kHz oscillator for audio testes.  You don't have to use the other oscillator. Front and rear panels include switchable audio input jacks.  Frequency from 10 to 100,000 Hz are shown at top dispaly quality with the built-in sweep generator.
 Special Features
1. The 3-inch viewing area with 25 mV/cm (minimum) deflection sensitivity provides easy-to-see audio waveform display and serves to visualize wave form of up to 200 kHz for diagnostic observation.
2. The built-in 1 kHz Oscillator for various testing of audio without using the other oscillator.
3. Switchable audio input jacks are provided on both front and rear panels.
4. The built-in Sweep Generator for observing the best dispaly of various frequencies from 10 to 100,000 Hz
5. Solid-State circuits insure cool and reliable performance. Long service life with virtually no maintenance is assured by the manufcturer.

Vertical Amplifier
25 mV p-p/cm (63 mV p-p/inch) at front panel input
250 mV p-p/cm (630 mV p-p/inch) at rear panel input
Frequency Response:  3 Hz to 200 kHz , -3 dB or less
Input Impedance:  250 k Ω
Input Capacity:
Less than 40 pF at front panel input
Less than 60 pF at rear panel input
Horizontal Amplifier
25 mV p-p/cm (63 mV p-p/inch) at front panel input
250 mV p-p/cm (630 mV p-p/inch) at rear panel input
Frequency Response:  3 Hz to 200 kHz , -3 dB or less
Input Impedance:  250 k Ω
Input Capacity:
Less than 40 pF at front panel input
Less than 60 pF at rear panel input
Sweep Generator
Sweep Frequency:  10 Hz to 100 kHz in four step
Synchronization:  Internal (-)
Frequency:  1,000 Hz ±10%
Output Voltage:  Max. 1 V RMS
Calibration (Test):  0,1 V p-p ±5%
Input and Output:
Audio Input (L & R), front & rear FM Multipath (V & H) ocsillator output
Selector Switch
Test, Wave Form (L & R), Stereo Display & FM Multipath
Cathode Ray Tube:  3 inches
Semiconductors:  4 FETs,  19 Transistors,  14 Diodes
Power oltage:  AC 110- 120 V, 220 -240 V, 50/60 Hz
Power Consumption:  25 watts
Dimensions (W x H x D):  408 x 134 x 280 mm, (16-5/16" x 5-5/32" x 11-1/32")

Weight:  17 lbs

Kenwood KF-8011

 Kenwood Solid State Audio Denoiser  KF-8011 does not belong to the conventinal noise filter which excludes necessary signals together with noises. It functions as the S/N Stretcher or Noise Reduction System used in the process of disc production, and electronically eliminates the noises included in the sources.  Thanks to its exclusive circuitry, KF-8011 remarkably increases the signal to noise ratio and fully refreshes the program sources. It's especially profitable for tape dubbing.
 Special features
Minute Denoising
The KF-8011 decreases the noises between 3 kHz and 15 kHz, which affects most badly on the sound performance, by 6 - 10 dB. The built-in Frequency Selector enables to pick up the particular frequency range in order to denoise precisely.

Noise level Adjustor
The KF-8011 features a pair of large Level Meters and 10-step type level Adjustor for setting and monitoring the suitable level pint of program sources. In addition, the volume of cut-off noises can be controlled by the Noise level Adjustor. That means KF-8011 always functions so as to keep the S/N ratio the best condition.

Sufficient Input Jacks
As the Denoiser is to be connected to the Rec/Play terminals of an amplifier, KF-8011 has the complete input and output for tape decks including DIN connector. It also has 4 pairs of input jacks and by the Input Selector on the front panel 4 sources are switchable.
Check System for Denoising Condition
The built-in Defeat Switch permits to check the denoising condition - what frequency range is to be denoised, how much the S/N ratio has been improved, etc.

Automatic Circuit Switching
As shown on the following diagram, the Denoiser is to be inserted to the input side when making refined recording, and to the output side when enjoying refined playback. It is, however, quite needless to reconnect KF-8011. The Denoiser Position on the front panel switches the circuitry automatically.

Frequency Response:  10 Hz - 80 kh ±0,5 dB
Noise Blocking Characteristics (0db =1 V, at 3,5 - 12 kHz):
Input Level / Noise Blocking Amount (S/N Improving Ratio):
0 dB / 0 dB
-30 dB / 0 dB
-40 dB / 2 dB
-45 dB / 10 dB
50 dB / 15 dB
Noise Blocking Filter Frequency Response:
3 - 4,5 kHz : -8 dB (1 kHz = 0 dB)
4,5 - 6,5 kHz : -8 dB (1 kHz = 0 dB)
6,5 - 10 kHz : -8 dB (1 kHz = 0 dB)
10 - 15 kHz : -8 dB (1 kHz = 0 dB)
(-20 dB at following points:  3,5 kHz, 5,5 kHz, 8 kHz, 12 kHz)
Gain:  0 dB ±1 dB
Maximum Input:  8 V at level Control "0" position
Distortion:  less than 0,09% (5,5 kHz, 1 V input)
Input Impedance:  More than 50 k Ω
Output Impedance:  1 k Ω
Level Difference of Counter-Channel:  Within ±1 dB (1 kHz)
S/N Ratio:  Better than 75 dB (1 kHz, 0 dB =1 V)
Channel Separation:  Better than 55 dB
Input and Output terminals:
4 x Input
2 x output
1 x Tape paly, Tape Rec
1 x Tape DIN
Switches and Controls: 
Tape Monitor Switch;
Large VU Meter;
De-Noiser Position Selector;
Filter Defeat Switch;
Level Control;
Noise level Control;
Through Switch
Power Voltage:  110 - 120 V, 220 - 240 V; 50/60 Hz
Power Consumption:  10 watts
Dimensions (W x H x D):  408 x 134 x 280 mm (16-5/16" x 5-5/32" x 11-1/32")

Weigt:  6,4 kg (14 lbs)

McIntosh MR 77

 Mclntosh research is a continuous program of exploration for new technology that permits performance improvement and greater value for you. This intensive research program developed the new technology necessary for the realization of these two new design concepts for the MR 77.

And, thorough, uninhibited research has developed the new technology necessary for the first Truly Low Distortion FM Tuner …  the MCINTOSH MR 77!
Even since the beginning of FM, research engineers have realized that constant delay, or linear phase, IF filters were necessary for low distortion reception. Crude approximations to constant delay have always been used in FM tuners — with disappointing results.
So-Called "Butterworth" or "Legandre" filters offer only a fair compromise with respect to delay error. Crystal and ceramic filters, usually based on the "Chebychev" model, work fairly well and give good selectivity, but none of these are constant delay (linear-phase) filters. Commercial tuners using these filters can show 5% stereo IM distortion at 100% modulation, and have delay errors up to 100%. In sharp contrast, the linear phase filter allows a tuner to show only .1% IM distortion at 100% modulation and has a delay error of only 1.2% in the useful bandpass. In its useful bandpass, it is a true mathematical approximation to linear-phase — the world's finest selective, linear-phase, minimum-phase shift filter.
A FORTRAN computer program using an algorithm that took six years to develop was used in its design. The mathematical complexity of the filter design procedure is almost beyond belief. Using a process called "numerical integration in the complex S-plane," a high speed IBM 1130 computer spent eighteen minutes on the design of the MR 77 IF filter. A human engineer, working twenty-four hours a day and seven days a week, would have taken 300 years to finish this work . . . assuming he made no mistakesl
The linear phase filter would be useless if it had to work into anordinary FM detector. Thus a new detector with suitably low distortion had to be developed. A search of the available literature revealed a little-known bridge circuit with a theoretical distortion of zero! However, designing a practical working circuit for a commercially feasible stereo tuner took some doing. A U. S. patent is pending on this circuit.
Distortion performance of the bridge detector is close to the theoretical zero. In addition to its excellent distortion performance, the bridge detector also exhibits capture ratio close to 0 dB. The linear-phase bridge discriminator uses a balanced transmission line bridge in conjunction with a differential voltage-doubling rectifier to achieve 99.9% accuracy demodulation of FM signals. The only adjustments in the MR 77 detector are two simple variable resistors. These resistors center the tuning meter and set the transistor bias. Complex tuning for minimum distortion is not needed.
Every Mclntosh instrument — every one — is tested to be equal to or better than the performance limits advertised. When a performance limit of 0.2% harmonic distortion is established for an instrument, Mclntosh means that every, each, all of the instruments manufactured must be capable of performance to that limit — or better — or your full purchase price is refunded.
One of the reasons Mclntosh can make this promise is that we 100% test each of the instruments for maximum performance. We are not content knowing that 10% of our instruments are tested and meet the performance requirements established by our engineering group. We must know that all of the instruments meet the requirements. This vigorous pursuit of excellence takes time. At Mclntosh more time means more care, more protection for you. There's no production rush at Mclntosh.
2 microvolts for 35 dB of quieting;
2.5 microvolts at 100% modulation (±75 kHz deviation) for 3% totalnoise and harmonic distortion
SIGNAL TO NOISE RATIO:  75 dB below 100% modulation
HARMONIC DISTORTION:  Will not exceed 0.2% mono or stereo at 100% modulation, 20 Hz to 15,000 Hz
INTERMODULATION DISTORTION:  Will not exceed 0.2% mono or stereo for any combination of frequencies from 20 Hz to 15,000 Hz with peak modulation equal to 100% or less. Typically 0.1%
AUDIO FREQUENCY RESPONSE:  ±1 dB 20 Hz to 15,000 Hz with standard deemphasis, (75 μS) and 19,000 Hz pilot filter
0.25 dB detector only
2.5 dB complete tuner at 100% modulation
IMAGE REJECTION:  100 dB; 88 to 108 MHz (IHF)
Adjacent channel 6 dB IHF, carrier 47 dB down
Alternate channel 50 dB IHF, carrier 90 dB down
STEREO SEPARATION:  40 dB at 1,000 Hz
10 dB noise reduction in position 1
20 dB noise reduction in position 2
SCA FILTER:  50 dB down from 67 kHz to 74 kHz 275 dB per octave slope
DRIFT:  25,000 Hz in first two minutes; thereafter 5,000 Hz in normal temperatures
MUTING:  70 dB noise reduction between stations
Position 1 :  5 microvolt
Position 2 :  20 microvolt
ANTENNA INPUTS:  300 ohms balanced; 75 ohms unbalanced
MAXIMUM SIGNAL INPUT:  12 RF volts across 300 ohms antenna terminals will not increase harmonic or intermodulation distortion
2.5 volts into 47,000 ohms
1 volt into 600 ohms from fixed output
IF SYSTEM:  8-Pole linear phase filter;  2 IC's;  1 J-FET, and push-pull overlay power transistor stage driving a linear phase bridge discriminator
STEREO INDICATOR:  Front panel stereo light activated by 19,000 Hz only
AUTOMATIC MONO-STEREO SWITCH:  Mclntosh developed; all electronic automatic mono-stereo switching circuit
SEMICONDUCTOR COMPLEMENT:  21 Transistors; 4 Integrated Circuits; 1 Indicator Tube
POWER REQUIREMENT:  120 - 240 volts,  50/60 Hz, 35 watts
FRONT PANEL:  16" wide (406 mm) by 5-7/16" high (138 mm)
CHASSIS:  15" wide (381 mm) by 13" deep (330 mm) including PANLOC shelf and back panel connectors.
Knob clearance: 1½ " (381 mm) in front of mounting panel
FINISH:  Front Panel: Anodized gold and black with special gold/teal nomenclature illumination. Chassis Chrome and black
MOUNTING:  Mclntosh developed professional PANLOC
27 pounds (12.25 kg) net
39 pounds (17.69 kg) in shipping carton

Denon DP-A100

 New model of Direct Drive Turntable.  Denon DP-A100.
Special edition of direct drive turntable  celebrating our 100th anniversary.

A History Like No Other.
The history of Denon turntables commenced in 1910 with the production of Japan’s fi rst gramophone and peaked in 1939 when Denon developed a disc recorder for NHK. Denon turntables were used not only by general users but by many radio stations professionals as well. In 1970, Denon developed its own high-torque AC motor for low speeds where speed was controlled by highly precise detection of magnetic pulses recorded around the perimeter of the platter. Denon incorporated this epoch-making servo technology in its development of the direct-drive turntable whose high performance and reliability represented a clear break from conventional idler and belt drive products, and earned Denon a solid position as the brand for players used at radio stations.
 In the following year, the turntable was adapted for consumer use, and Denon, which continued to produce direct-drive players, became an unforgettable brand of analog players among audio enthusiasts. The DP-A100 player is being released as a Denon anniversary model with the same high-performance Denon direct-drive turntable technology that has delivered cogging-free, high-precision rotation for 40 years. Equipped with the DL-A100 cartridge, the DP-A100 is capable of masterfully reproducing the energy and beauty of analog discs.

The Signatures of Quality.
The DP-A100 features the 100th anniversary logo badge, and comes with a 5-year warranty and a signed certifi cate of authenticity from the chief production engineer who hand crafted the product. Also included is the DL-A100 cartridge and a beautiful Denon “brand book” that explores the history of one of the leading names in the audio-visual field.
 High quality audio
• Natural wood cabinet with dark-brown finish The DP-A100’s beautiful cabinet has been made with sliced veneer of natural wood and given a multi-coat finish similar to lacquer to produce a deep glossy lustre.
• Large platter for stable rotation
The DP-A100 has a large die-cast aluminium platter with a diameter of 331mm. Silicone rubber, a deadening material, has been applied over the entire reverse side to minimise vibration and suppress howling.
• Quartz lock servo and direct drive, to support stable rotation
The DP-A100 uses a quartz lock servo that controls rotation frequency by detecting pulses of light passing through a slit inside the motor. This quartz lock servo and direct drive motor work together to ensure high-precision rotation.
• Highly sensitive universal tone arm
The DP-A100’s tone arm is mounted on a large aluminium die-cast base whose height can be adjusted in a range of 6mm. When this tone arm is used with the machined aluminium head shell that comes with the DP-A100, unwanted vibration is absorbed and the cartridge can perform at its maximum capacity.
• Large insulators
Large insulators have been installed on the DP-A100 to achieve ideal damping characteristics against external vibration.
• Included DL-A100 MC stereo cartridge

Specifications DP-A100
Turntable Section
Driving System:  Servo system direct drive
Speed:  33 − 1/3 rpm, 45rpm
Wow & Flutter:  Less than  0.1 % WRMS
Starting Time:  Specified speed within 0.3 sec (for 33 rpm)
Turntable:  Aluminum die-cast, 331 mm in diameter
Motor:  Direct-drive motor
Speed Control System:  Quartz control
Load Characteristics:  0 % with the stylus pressure 80 g
Speed Deviation:  Within ± 0.003 %
Tone Arm Section
Arm Form:  Static balance S-shaped pipe arm
Effective Arm Length:  244 mm
Overhang:  14 mm
Tracking Error:  within 3°
Arm Height Adjustable Range:  about 6 mm
Stylus Pressure Variable Range:  0 to 4.0 g (One step 0.25 g)
Suitable Cartridge Empty weight:  4 to 10 g
Head Shell Weight:  18 g (176mN) (including screws, nuts, nylon washers)
Cartridge Space Weight:  0.25 g (1 sheet
Power Supply:  AC 230 V, 50 Hz
Power Consumption:  10 W (depends on Electrical Appliances and Material Safety Act)
Dimensions (W x H x D, Maximum External):
With dust cover closed : 490 × 213 × 405 mm (including protruding parts)
With dust cover open : 490 × 515 × 465 mm (including protruding parts)

Weight:  15.7 kg

New model of Stereo Cartridge.
Special edition of stereo cartridge 
celebrating our 100th anniversary

Denon DL-A100

 New model of Stereo Cartridge. Denon DL-A100.
Special edition of stereo cartridge celebrating our 100th anniversary

A Parallel Evolution.
The production of Denon cartridges began in 1941 when Denon began to develop cartridges for use at broadcast stations. Since then, cartridges of superior quality have been produced alongside the evolution of the record, and in 1961 Denon jointly  produced the DL-103 with NHK, Japans national broadcaster, for use at FM stations. The DL-103 was able to play stereo LP records with high fidelity and reliability (providing easy handling and stability). Though the DL-103 was sold as a product for professional use, Hi-Fi audio enthusiasts felt such superior performance should not be limited to the realm of professionals, and in1970

Denon made the DL-103 available to the general market.
The basic design of this model continues to achieve first-rate performance and play an active part in todays world. The DL-A100 is an anniversary model that has been recreated to celebrate 100 years of an engineering sample that was a unique and closely held secret at the time the DL-103 was developed. The DL-A100 represents the standard model that has been in production for  a little less than a half centurynow reborn with the latest tuning for your enjoyment

The Signatures of Quality.
The DL-A100 features the 100th anniversary special case, and comes with a 5-year warranty and a signed certificate of authenticity from the chief production engineer who hand crafted the  product. Also included is a beautiful Denon brand book that  explores the history of one of the leading names in the audio-visual field. 
 High quality audio
Independent 2-ch Moving Coils
The DP-A100 employs independent 2-channel moving coil cartridges to facilitate playback over a wide frequency range from low- to high-level signals. Superior playback performance is also possible due to the flat frequency response and minimal left-right sensitivity (level) differences.
Fulcrum point of vibrating system that achieves stable tracking
The fulcrum point of the DP-A100s vibrating system is made of extremely fine piano wire, and the tip of the stylus tracks smoothly in the groove of the record.
Dual-structure cantilever
The DP-A100 uses a lightweight yet rigid dual-structure cantilever. Superior frequency response over the entire audible frequency range is achieved by minimizing the mechanical impedance of the vibrating system.
Long-lasting solid diamond stylus
Since the tip of the DP-A100’s stylus uses a solid diamond, stable characteristics with negligible friction are maintained for a long time. In fact, each diamond is individually fitted into the stylus so that the hardest section – where the diamond has crystallized touches the wall of the groove.
Cross-shaped iron core and coils, to minimize sensitivity differences between channels. Wrapping separate coils on the cross-shaped iron core has successfully minimized sensitivity differences between the left and right channels while reducing mass.
Characteristics chart packed with each product as a guarantee of superior performance Each individual DP-A100 has been carefully manufactured and packed with its own characteristics chart to guarantee superior performance.

Specifications DL-A100
PrincipleMoving coil (MC) type
Output Voltage0.3 mV  (1 kHz, 50 mm/s horizontal direction)
Channel Balance1 dB max. (1 kHz)
Channel Separation 25 dB min. (1 kHz)
Electrical Impedance40 ohms ±20 %
Compliance5 x 10⁶ m/N (Using a 100 Hz record)
Stylus0.2 mm square solid diamond
Tracking Force25 mN ±3 mN (2.5 g ±0.3 g)
Frequency Response20 Hz to 45 kHz
Weigh8.8 g
Load Impedance100 ohms min. (40 ohms when using a transformer)

Audio Research SP-6 (1978)

 Audio Research SP-6 High Definition music  stereo preamplifier features:
Close tolerance segmented gain control; 2 dB steps (guaranteed, 1½ dB tracking, ½ dB typical)
Front panel "mute" switch for repeat settings, interruptions, etc.
Rear panel gain "range" switch (+10 dB) for high efficiency speakers, high output cartridges, etc.
Special "off-chassis" construction, with all inputs/outputs isolated form chassis, plus circuit filters to eliminate or minimize "RFI", "TVI", and "CB" interference.
Rear panel provision to disconnect "common" from chassis so that rack mount installations with power amplifiers, etc., may be accomplished without ground-loop induced hum
Separate on-off switch and indicator for amplifier (etc.) power receptacles (3), relay controlled, 1600 watt capacity.
Front and rear panels are of two-color anodized aluminum construction for permanent finish
Industrial grade components and construction for long service life. Rated for continuous commercial service.
 With the introduction of power amplifiers such as the D-52, D-110 and D-350, and the availability of a number of brands of high performance speaker systems, the need for a new and higher level of preamplifier performance for the best systems has occurred.
After a significant amount of research and study , we have determined that from a cost-effectiveness standpoint, once again, the vacuum tube must be used.
We then felt that if such a project were to be undertaken, it would be desirable to execute it to the highest standards reasonable, recognizing that in all probability it would be the last significant vacuum tube product offered to the music world.
One of the expensive (and little recognized) requirements for such a concept would be a power supply capable of providing isolated and regulated voltages to each circuit section. This has been accomplished in the SP-6 by utilizing an all solid state triple section regulator with massive "filtering" at the output of each section.
With such a power supply available, it now becomes possible to increase the bandwidth of an AC coupled vacuum tube design without compromising the all important circuit stability. We have done this, drawing upon the Sp-3 basic circuit design. Increased interstage time constans, larger output coupling capacitors, and "DC concept" feedback circuit innovations, all combine with the new power supply to provide a new standard of sound reproduction.
Only high quality turntables with stable pickup arms and cartridges should be used with this preamplifier.
We suggest that this preamplifier will provide the state-of-the-art. Reference well into the '80s. We further suggest that inclusion of this unit in any otherwise good music reproducing system will effect more improvement than any other single component change.
Frequency Response: 
High level Section : ± .25 dB, 10 Hz to 30 kHz, -3 dB points approx. 1hz and 250 kHz into hi-Z load. (-3 dB point approx. 1 Hz into 100 k Ω load)
Magnetic Phono : ±1 dB of RIAA from 30 Hz to 15 kHz
Harmonic Distortion:  less than .03% at 5 volts RMS output, IHF load, 20 Hz to 20 kHz (typically about .003% in midband)
Intermodulation Distortion:  less than .008% at 5 volts RMS output, IHF load, SMPTE method
Magnetic Phono Input to Tape Output : 34 dB
Magnetic Phono Input to Main Output : 60 dB
High Level Input to Tape Output : 0 dB
High Level Inputs to Main Output : 26 dB
Input Impedance:  50 k Ω , all inputs (Magnetic phono may have any value from 10 Ω to 100k Ω subsituted. Also has provision to add input capacitance for matching certain magnetic cartridges)
Output Impedance:  500 Ω at 1 kHz, rising to 2,1k Ω at 20 Hz , all outputs (recommended minimum load for maximum audio quality, 20 k Ω)
Maximum Inputs:
Magnetic Phono : 700 mV at 1 kHz (.2 volts RMS, 100 kHz)
High Level Inputs : esentially overload proof.
Rated Outputs:  5 volts RMS 20 Hz to 30 kHz, all outputs, IHF load.  (Main output capability is 60 volts RMS output at < 1% THD at 1 kHz into 100 k Ω load with 3 volts RMS high level input)
High Level Noise:
250 uV RMS max. Residual unweighted wide-band noise at main output with gain control minimum (86 dB below 5 volts RMS output)
More than 90 dB below 1 volt RMS input (less than 20 uV equivalent input noise)
Magnetic Phono Noise:  5 uV equivalent input noise, wide-band RMS (-66 dB reference 10 mV input)
Tube Complement:  6 premium grade ECC 83/12AX7
Power Requirements:  105 -120 / 210 - 240 V AC, 50/60 Hz,
Power Consumption:  35 watts
Dimensions (W x H x D):  480 x 134 x 260 mm (19" x 5¼" x 10¼")
Handles extend : 41 mm (1-5/8") forward of front panel
Rear Chassis fittings extend : 23 mm (7/8")

Weight:  10 kg (22 lbs) net

Celestion Ditton 121

 The Celestion Ditton 121 is bookshelf 2-way speaker systems from the 80's a 
large clean soundfrom a small cabinet.
1.Baffle edges contoured for excellent acoustic properties
2.Glass filled nylon clamp ring
3.Integral HF unit rear loading cnclosure
4.Barium ferrite magnet 1.0. Tesla
5.Pressure formed aluminium dome
6.Critically located damping elements
7.Baffle injection moulded from foamed styrene for strength and rigidity
8.Neoprene roll surround
9.Resistent protective grille formed from perforated rigid polystyrene sheet
10.Four layer voice coil
11.Barium ferrite magnet 0.7 tsla
12.Integral crossover and terminal housing module. Terminal posts connected directly to crossover board
13.Bonded acrylic fibre damping

14.High density particle board cabinet assembled with baffle integral
Overall Frequency response:  60 Hz to 18 kHz (±6 dB)
Impedance: 8 Ω nominal
System Resonance: 75 Hz
System Q:  1.2
Sensitivity:  2.5 watts pink noise input produces 90 dB SPL at 1 metre in anechoic conditions
Crossover Frequency:  4 kHz
Power Handling: 
Max. Rated power 40 watts programme (without clipping)
Continuous Sine Wave voltage rating 9.0 V 20 Hz - 4 kHz ; 4,5 V 4 kHz - 20 kHz
Amplifier Requirements:  10 -40 watts
Finish:  Teak, Walnut, Black
Internal Volume:  18 litres
Dimensions (W x H x D):  265 x 395 x 226 mm

Weight:  6 kg each net

Tandberg 3500X

 Unsual facilities.
The 3500X has unsual facilities for record and playback. The Tape/Source buttons determine whether record monitoring will be a source (programme0 test or a tape test (A test or B test). The tape test is particularly useful because you can listen to tape that has just been recorded while the recording continues.
Tape recorder 3500X is suitable for every music installation.

A model in geat demand in the middle price bracket with a good performance and many attractive features. Suitable for all Hi-Fi music centers providing record/playback in stereo or mono with excellent sound quality. The 3500X is designed for connection to a good quality stereo amplifier such as the Selvsuper, the Huldra or the TR 220.
 The recording quality determines the sound quality.
The playback quality of a tape can never be better tahn the recording quality. A tape recorded on a poor tape recorder can never be improved even when it is played back on a god machine. Tandberg has always paid particular attention to this point when designing tape recorders. The Tandberg Crossfield technique was specially developed to raise the recording quality. The tape transport and the tape path have been designed to allow the tape to pass smoothly and precisely across the heads without undue strress and strain. The heads have been developed and manufactured by Tandberg to exploit the best features of the latest types of tape. Everything possible has been done to ensure that the recording quality is excellent.
Even though the 3500X is reasonably prieced it is fully equpped to play a central role in any Hi =Fi music centre.
Tandberg Crossfield recording technique
3 speeds; 7½, 3¾, and 1 ips.
4 heads
Precise control of record and playback levels with slide potentiometers
Large peak indicating meters - the best way to measure programme levels
Easy editing with direct switchover from playback to record
Tape and source monitoring during recording
Trick recording facilities: sound-on-sound; echo; mixing in mono
Front jack for stereo headphones

The photo-electric stop
Model 3500X is equiped witha photo-electric stop. The tape passes between a lamp and a photo-transistor. At the end of the tape or when the tape is transparent, the forward drive stops automatically.

Tape Speeds:  7½, 3¾, and 1 ips
Speed tolerance ± 1 max.
Wow and Flutter (Peak Din 45 511 / Weighted RMS) 
7½ ips : 0,1% / 0,07%
3¾ ips : 0,18%/ 0,12%
1 ips : 0,35%/ 0,25%
Frequency Response (DIN 45 500 / ±3 dB):
7½ ips : 30-26,000 Hz /30-22,000 Hz
3¾ ips : 30-20,000 Hz / 40-18,000 Hz
1 ips : 30-11,000 Hz / 40-9,000 Hz
Signal/Tape Noise Ratio: 
IEC, A-curve (DIN 45 500, weighted) : 64 dB
IEC, unweighted RMS (DIN 45 500, unweighted) : 75 dB
Crosstalk Attenuation (at 100 Hz minmimum):  60 dB Mono; 50 dB Stereo
Harmonic Distortion:
From amplifier at 0 dB : 0,3%
From tape at 0 dB recorded level : 3%
Inputs Impedance/Sensitivity (max. Voltage):
MIC : 130 µV/25 mV
Radio : 50 k Ω/8 mV - 1.2 V
Line : 500 k Ω/100 mV - 10 V
Radio, Line : 5 k Ω/1 V
Headphones : 100 Ω/1 V
Power requirements:  115/220/230 V 50/60 Hz
Power Consumption:  45 W
Dimensions (W x H x D):  400 x 180 x 410 mm (15¾" x 7" x 16")
Weight:  9,1 kg (4 ¼ lb)

Finished:  Wood veneers in teak or rosewood  (oak or walnut to order)

Ortofon MC 10

There are as many expert opinions on HiFi as there are experts. With all the variables, an incredible range of systems can be produced and all have their different advantages but almost all experts agree that moving coil is superior to magnetic construction for cartridges.
Moving coil's  detailed reproduction of spaciousness, three dimensional imagery and startling transient response surpasses that of even the best magnetic cartridge.
There is really only one choice if you wish to take full advantage of the capabilities of your HiFi system. Until now the high cost of the hand built moving coil cartridge has kept peak performance beyond the reach of all but the most wealthy.

Now Ortofon who have continuously developed moving coil technology since 1948, are able to produce a moving coil cartridge at a price which compaares to the cost of medium quality magnetic cartridges.
Ortofon's long experience of cartridge design and manufacture make the finest reproduction available to all discriminating listeners with the MC 10 moving coil cartridge.

The MC 10's caantilever has been designed on new principles, making it easier and faster to produce. It is as light and as rapid as possible, utilizing a new aluminium alloy. The new cantilever design, together with a tiny, specially polished diamond, gives a very low stylus tip mass,excellent tracking ability, easy handling of transients and minimal record wear.
Owing to their small output voltage and low inner resistance, moving coil cartridges cannot be connected directly to a conventional phono input and it is therefore necessary to boost the signal.

MC 10 Cartridges are available separately or in a cost saving pack complete with the specially developet STM 72 step-on transformar for perfect matching to your amplifier.
Weight:  7 g
Output Voltage (per channel at 1000 Hz, 5 cm/s):  0,1 mV
Output Voltage (per channel at 1000 Hz, 5 cm/s with STM 72 or MCA 76):  5,0 mV
Internal Impedance DC Resistance per Channel:  3 Ω
Vertical Tracking Angle: 20
Frequency Range:  10 - 50,000 Hz
Frequency Response:  10 - 20,000 Hz, +3 dB -2 dB
Channel Separation at 1000 Hz:  >22 dB
Channel Balance:  <2 db="" p="">
Horizontal : 15 µm/mN
Vertical : 15 µm/mN
Tracking ability at 3000 Hz at recommended tracking force:  >50 µm
FIM Distortion at recommended Tracking force:  ≤1%
Type of Stylus: Elliptical
Stylus Tip Radius:  18/8 µm
Equivalent Stylus Tip Mass:  0,5 g
Tracking Force Range:  17 - 23 mN (1,7 - 2,3 gm)
Recommended Tracking Force:  20 mN (2,0 gm)

C.E.C Disco 4000MkII

 No Noticeable Feedback
In the eardrum bursting environment of loud disco  music, it is very important to have no feedback. CEC has achieved this almost impossible task through its years of experience in turntable design and manufacture. Disco 4000MkII has such feedback preventing features as a special damper in the tonearm section, high mass damped cabinet support structure and a three-layer structure that is a breakthrough in turntable design. Resting on shock absorbing rubber dampers, the turntable is isolated from any outside vibrations. As a final measure, the plate that lies between the turntable and rubber damper supports is a heavy die cast metal plate that further separates the system from its environment for perfect record play. Feedback absorbing design is perfected in the Disco 4000MkII to virtually eliminate physical vibration.
 Sensitivity In a Brutal Environment
Designed to excel in the highly competitive world of disco performance, Disco4000MkII incorporates advanced features and high performance required by true professionals.
Quick Start Operation
In the world of disco, instant response is vital to high performance. This advanced turntable has quick start features for perfect starting in ¼ revolution (at 33 1/3 rpm). A superb combination of high torque DD quartz lock motor and high performance aluminum die cast turntable flywheel crystalizes the effect of quality built into this advanced Disco 4000MkII. The newly developed electronic braking circuit enables quick stops in 1/3 revolution. True professional disco operation is now made much easier with this most suitable turnable.
 Wide Variation Pitch Control and Other Features
Pitch control has a wide variation of ±8% and the difficult to locate groove is more easily found with the help of a detachable illumination lamp. The quick start/stop switch is separate from the power switch and the quartz On/Off switch is useful for cases when speed variation is not needed. CEC has considered the smallest requirements and given its largest effort to making Disco 4000MkII a turntable to be desired by every professional in the disco field.

Wired Remote Control Keeps The Situation in Hand
The built-in wired remote control unit keeps the busiest situations in hand by controlling the player's quick start/stop and replay. Multiplayer operation is now possible and other disco equipment can be operated simultaneously with minimum distraction.
 Low Mass, S-Shape, Static Balanced Tonearm
CEC has been perfecting its tonearms year-by-year and now has incorporated into Disco 4000MkII a low mass, S-shape static tonearm with high sensitivity ball bearings. Further stability is provided by the diecast aluminum strongman that provides the critical link to the housing. Strong and delicate, the tonearm has a removable head that is designed for quick change in case of stylus damage. An extra head is provided as standard equipment of disco play where quick cartridge change can mean the difference between success and disaster.

Loved by Homepros Also
The hemepro, that perso who demands the best in the home, will find Disco 4000MkII a real delight to use and enjoy. The oil damped cuing device gently lowers the stylus with great precision and absoulte silence every time.
Type:  Professional disco turntable with quartz-lock, DD motor
Motor:  20-pole, 3-phase, brushless DC motor
Speeds:  33-1/3 and 45 rpm
Speed Calibration:  Pitch control ±8% (Quartz-look off)
Wow and Flutter:  0,055% (WRMS)
Rumble:  70 dB (DIN-B weighted)
Built-up:  Within ¼ turn
Braking: Electronic system, within ¼ turn
Type:  s-shape tubular, static balance type with removable headshell and anti-skating device
Effective Length:  222 mm
Overhang:  16,8 mm
Adjustable Tracking Force:  0 - 3 g with direct readout weight
Usable Cartridge Weight:  5 - 8 g
Power Source:  120 V - 230 V 50 /60 Hz
Power Consumption:  8 W
Dimensions (W x H x D):  416 x 132 x 362 mm

Weight:  7 kg