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





Decibel Modus 3


E' un diffusore di concezzine originale, ma affatto nuova. Nata su un brevetto di un costruttore di Brescia,questa cassa ha la sua maggiore qualità nella assenza di problemi di dispersione orizzontale, in quanto la sistemazione dei due trasduttori all interno della cassa cilindrica rendono l'emissione perfettamente omnidirezionale, come è possibile pure rilevare dalla risposta in camera anecoica eseguita a diverse angolazioni. Questa caratteristica fa si che risultino più importanti del solito le caratteristiche dell'ambiente d'ascolto ed il suo trattamento in quanto l'emissione è appunto uguale nelle varie direzioni. Appaiono carenti le gamme media ed alta, in particolare quest'ultima, (anche per la griglia fitta) che però può essere compensata in parte agendo su una regolazione del tweeter.
Diversa da tutte le altre, questa cassa acustica cilindrica realizza un'idea non certo nuova ma sempre affascinante: quella di costruire un diffusore che sia esente dal problema della direzionalità (almeno sul piano orizzontale), in mode che l'ascolto non dipenda dalla posizione dell'ascoltatore nell'ambiente. La simmetria cilindrica è una struttura che soddisfa questa richiesta e per questo, all'interno di essa i due trasduttori per le basse e le alte frequenze sono rivolti verso l'alto cosi da non dipendere dalla posizione della cassa sul pavimento. la risposta in camera d'ascolto con rumore rosa evidenzia un calo costante della curva all'aumentare della frequenza; la stessa carenza sui medio-alti è stata notata all'ascolto, anche se compensata in parte agendo sull'apposito trimmer a vite posto sotto al mobile assieme ai morsetti per il collegamento all'amplificatore. Non emerge una chiara individualità di questo diffusore all'ascolto, il cui giudizio è stato compromesso anche dalla posizione non ottimale nell'ambiente d'ascolto, che proprio in vitrù della omnidirezionalità agisce sensibilimente sulla resa; la possiamo tuttavia ritenere più adatta alla riproduzione di musica da camera e classica in genere, con una buona timbrica in caso di pochi strumenti ma una tendenza ad "impastare" nei pezzi orchestrali e pieni.
La realizzazione del mobile è accurata e può essere richiesta sia la versione noce che quella laccata in bianco; la sistemazione è da pavimento. La Modus 3 è nominalmente una 40 Watt e pesa ben 30 kg.
Non ha piedini di appoggio ma la parte centrale della base è sollevata rispetto al bordo per permettere l'alloggio dei morsetti di collegamento, che non è dei più comodi; i cavi possono essere fatti passare attraverso delle scanalature. Per la sua prerogativa che la contraddistingue ( e brevettata dal costruttore bresciano) il diffusore è battezzato Sistema 360, come i modelli che utilizzano il medesimo principio.
La potenza sopportabile da questa cassa è senz'altro superiore a quella prudenzialmente dichiarata dal costruttore.

Caratteristiche:
Sistema: omnidirezionale
Numero vie: 2
Altoparlanti: 1 woofer, 1 tweeter a compressione
Impedenza nominale: 8 ohm
Potenza nominale: 40 Watt
Potenza consigliata: 100 Watt
Dimensioni: 800 x 425 mm (altezza x diametro)
Peso: 30 kg

LEAK Delta 70 (1972)


Circuit description
Power Amplifier - The output transistors and temperature compensation diodes are mounted on the heat sink, the remainder of the circuitry being located on the power amplifier P.C. boards. Power transistors are insulated electrically from the chassis by mica washers.
Quiescent current is measured by removing the appropriate HT fuse, and inserting a current meter. The current is adjusted by P% and should be approximately 40mA.
The amplifier D.C. output voltage (pin D on power amp board) should be +37 V with an HT supply of +75 V. This voltage is set by fixed circuit components, and significant deviation of this "midpoint" voltage indicates component failure,not necessarily an output transistor.
Full output for each channel is realised with 16 - 7 V RMS across an 8 ohm load.

Pre-Amplifiers
The P.C. contains tone control circuitry (excluding potentiometers) R1AA equalisation for disc input, filter components, and appropriate amplification for all inputs.
With all inputs short circuit, volume control maximum, other controls level, noise output voltages should be less than the following: 7-5 mV on Tuner and Replay, 22 mV on other inputs
The sensitivities for each input to provide full output are indicated in the specifications (1 kHz sine wave). The corresponding output from the preamplifier,measured at the tape sockets is: phono socket output 400 mV approx. DIN output 40 mV approx.


Specification
Rated Power Output:
40 + 40 watts into 4 ohms,
35 + 35 watts into 8 ohms,
28 + 28 watts into 15 ohms.
Music Power Output (IHF):
100 watts into 4 ohm loudspeakers,
90 watts into 8 ohm loudspeakres,
60 watts into 15 ohm loudspeakers.
Total Harmonic Distortion: 0-1% at ALL power levels up to 25 watts at 1 kHz each channel into 8 ohm loudspeakers.
Total Intermodulation Distortion: Input - 70 Hz anf 7 kHz in ratio of 4:1, Less than 0-5% for ALL power levels up to 35 watts into 8 ohms
Hum and Noise: 66 dB below 30 watts into 8 ohm load on Tuner and Replay and 56 dB below 30 watts on other inputs.
Cross Talk: between L and R channels, -50 dB up to 1kHz and -30 dB at 10 kHz.
Input Sensitivities:
Disc 1 (RIAA Characteristic) 2 mV at 1 kHz Input Impedance 47 kohm.
Disc 2 (RIAA Characteristic) 10 mV or 30 mV at 1 kHz Input Impedance 33 kohm, 100 kohm.
(Selected by switched input attenuator marked HI and LO on rear panel).
Damping Factor:
40 measured at 1 kHz for 15 ohm loudspeakers.
20 measured at 1 kHz for 8 ohm loudspeakers.
Tuner 1 Mic
25 mV or 2 mV
47 kohm, 47 kohm
Tuner 2:
60 mV or 250 mV
50 kohm, 50 kohm
(Selected by switched input attenuator marked HI and LO on rear panel).
Replay:
400 mV
47 kohm
Frequency Response: 30 Hz to 20,000 Hz (±1 dB)
Tone Control Range: 50 Hz to 14,000 Hz (±16 dB)
Filter: 12 dB per octave rolloff above 6 kHz
Dimensions: 344 x 118 x 238 mm


Onkyo Reference Series (80's-Styled Separate Hi-Fi Components)


Onkyo’s new range of hi-fi components are styled after the company’s classic stereo models of the 1980s. All three components, the P-3000R pre-amplifier, M-5000R power amplifier, and C-7000R CD player, incorporate Onkyo’s new Dynamic Intermodulation Distortion Reduction Circuitry (DIDRC) to counteract unwanted high-frequency interference, promising audio playback that is more faithful to the original source. To further reduce interference, these components feature separate digital and analog circuitry. The P-3000R pre-amp accepts both analog and digital sources, with connectivity options including AES/EBU digital connectors and a USB input for PC audio. A high-quality 32-bit Burr-Brown DAC is provided for each stereo channel, to optimize audio performance. The M-5000R power-amp offers the advanced AWRAT amplification design which combines DIDRC with a low NFB design, closed groundloop circuits, and high instantaneous-current capability. To ensure minimal signal interference, the C-7000R CD player employs a thermally regulated, high-precision clock with a state-of-the- art crystal oscillator. To further reduce potential interference, the player can be operated in analog-only or digital-only mode.

Onkyo P-3000R


Two-Channel Pre-Amp Delivers Sublime Audio
Despite being at the cutting edge of the burgeoning home theater market, Onkyo has never forgotten its roots in pure hi-fi audio. With the P-3000R, we present a streamlined two-channel pre-amplifier that packs a treasure trove of stunning audio technology. The P-3000R handles both analog and digital sources, with connectivity options including AES/EBU digital connectors and a USB device for PC audio. Separate 192 kHz/32-bit TI Burr-Brown DACs for each channel ensure accurate digital-to-analog conversion. Meanwhile, to minimize interference and maintain signal quality, the P-3000R employs noise-reducing DIDRC technology, a vibration-resistant chassis design, and independent amplifier circuitry. Thanks to the P-3000R’s bi-amping capability, you also have greater flexibility in how you set up your system. As always, the job of all this advanced hardware is to bring you closer to your music and let you feel the unique resonance of each individual instrument.
Special Features
DIDRC (Dynamic Intermodulation Distortion Reduction Circuitry)
PLL (Phase Locked Loop) Ultra-Low Jitter Technology
Separate TI Burr-Brown 192 kHz/32-Bit DACs (PCM1795 x 2) for L/R Channels
Amphenol AES/EBU Balanced Digital Input
USB Device (C-Media CM6631) for 192 kHz/32-Bit HD Audio from PC*
Playback of PC audio requires dedicated software that can be downloaded from an Onkyo website
Processing
DIDRC (Dynamic Intermodulation Distortion Reduction Circuitry)
Separate Digital/Analog Circuitry
Separate Massive Transformers for Digital/Analog Circuitry (Toroidal for Analog)
Anti-Vibration Side-Mounted Circuit Board Construction
Sampling Rate Convertor (Up to 192 kHz)
192 kHz/32-Bit DACs (Burr-Brown PCM1795 x 2)
Direct Mode
Discrete Phono Equailizer
Connectivity
Phono Input (MM)
USB Input (for 192 kHz/32-Bit HD Audio from PC*)
AES/EBU Balanced Digital Input (XLR)
Digital Inputs (optical/coaxial) (2/2)
Digital Output (Optical)
Separate L/R Bi-Amp-Capable Pre-Outs
Gold-Plated, Machined Solid Brass, 19mm-Pitch Audio Terminals
Miscellaneous
High-rigidity, anti-resonant chassis
Separate Anti-Vibration Aluminum Panel Construction (Top, Front, Sides)
Tone Control (Bass/Treble)
Independent Headphone Amplifier
12 V Trigger Output
Display Dimmer (Normal/Dim/Off)
Detachable AC Cord

Product Specifications
THD + N (Total Harmonic Distortion+Noise): 0.005% (20 Hz–20 kHz, Power Rated)
Input Sensitivity and Impedance (Unbalance): 200 mV/47 k-ohms (Line); 2.7 mV/47 k-ohms (Phono MM)
Rated RCA Output Level and Impedance: 1 V/330 ohms (Pre out)
Maximum RCA Output Level and Impedance: 5.0 V/330 ohms (Pre out)
Phono Overload: 80 mV (MM, 1 kHz, 0.5%)
Frequency Response: 5 Hz–100 kHz/+0 dB, -3 dB (Line)
Tone Control Charcteristics: ±8 dB, 50 Hz (BASS); ±8 dB, 20 kHz (TREBLE)
Signal to Noise Ratio: 110 dB (Direct, IHF-A); 80 dB (Phono, IHF-A)
Digital Inputs:
Optical: 2; Coaxial: 2; 2ch PCM; Digitial Input Sampling Rate:;32 kHz/44.1 kHz/48 kHz/88.2 kHz/96 kHz;compaitible (OPT);32 kHz/44.1 kHz/48 kHz/88.2 kHz/96 kHz/;176.4 kHz/192 kHz compatible;(COAX, AES/EBU);44.1 kHz/48 kHz/88.2 kHz/96 kHz/192 kHz compatible;(USB)
Analog Stereo Inputs: PHONO, CD, LINE 1, LINE 2, TAPE (LINE 3)
Balanced Input: AES/EBU (DIGITAL)
Digital Outputs:
Optical: 1;Digital Output Sampling Rate:;32 kHz/44.1 kHz/48 kHz/88.2 kHz/96 kHz;compatible (OPT)
Analog Stereo Outputs: TAPE (LINE)
Pre Outputs: 2
Phones: 1 (6.3 Ø)
12 V Trigger Output: x 1
RI: x 1
PC Interface: USB
Power Supply: AC 120V~, 60 Hz
Power Consumption: 26 W
Dimensions: 17 1/8" x 3 7/8" x 13 1/8" (435 x 99 x 333.1 mm)
Weight: 24.3 lbs. (11.0 kg)

Onkyo M-5000R


Thrill to the Visceral Power of Stereo
Music, when you hear it in all its glory, has the power to lift the spirits and transport you into another realm. Driving you there in audiophile style is Onkyo’s newest hi-fi power amplifier, the M-5000R. Signal quality on the M-5000R is meticulously preserved by new AWRAT technology, while three-stage inverted Darlington circuitry provides extremely efficient power output. Massive twin toroidal transformers and four 27,000 µF capacitors work to stabilize the power supply and current, respectively. And to minimize errors in stereophonic playback, the amplifier incorporates a totally symmetrical alignment of power devices for left and right channels.
Special Features
AWRAT (Advanced Wide Range Amplifier Technology)
Quad Push-Pull Amplification Design with Three-Stage Inverted Darlington Circuitry
Two Massive Toroidal Transformers with Sub Transformer
Four Large 27,000 µF Capacitors
Balanced XLR Input for Monaural Amplification in BTL Mode

Specifications
Power Output (2 ch stereo)
4 ohm: 150 W/Ch (20Hz - 20kHz, 0.05%, 2ch driven, FTC)
4 ohm: 170 W/Ch (1kHz, 1%, 2ch driven, FTC)
8 ohm: 80 W/ch (20Hz - 20kHz, 0.05%, 2ch driven, FTC)
8 ohm: 100 W/Ch (1kHz, 1%, 2ch driven, FTC)
Power Output (BTL mono)
6 ohm: 220 W/Ch (20Hz - 20kHz, 0.05%, 1ch driven, FTC)
6 ohm: 250 W/Ch (1kHz, 1%, 1ch driven, FTC)
8 ohm: 180 W/Ch (20Hz - 20kHz, 0.05%, 1ch driven, FTC)
8 ohm: 200 W/Ch (1kHz, 1%, 1ch driven, FTC)
Dynamic Power
1 ohm: 460 W
2 ohm: 320 W
3 ohm: 245 W
4 ohm: 196 W
6 ohm: 142 W
8 ohm: 110 W
THD + N: 0.005% (1kHz, Half power); 0.02% (20Hz-20kHz, Half power)
Input Sensitivity and Impedance: 1.4V/10 k-ohms (BTL); 700mV/10k-ohms (RCA)
Frequency Response: 10 Hz - 100 kHz/0dB, -1db (1 W); 1 Hz - 250 kHz/-3dB, (1 W/8ohm)
Signal to Noise Ratio: 110 dB (RCA, IHF-A)
Speaker Impedance
RCA Stereo: 4 ohms - 16 ohms
XLR mono: 6 ohms - 16 ohms (BTL)
Power Supply: AC 120V~, 60 Hz
Power Consumption: 8.4 A
Dimensions: 17 1/8" x 7 3/8" x 17" (435x187.5x432.5mm)
Weight: 51.8 lbs (23.5 kg)

Onkyo C-7000R


High-Class Playback Solution
CDs have been with us for decades now and continue to provide a convenient, high-quality listening experience. The C-7000R brings together features and refinements to bring the very best out of your audio CDs and CD-R/RWs, and even any MP3- or WMA-encoded discs you may have made on your computer. To ensure minimal signal interference, the C-7000R employs a thermally regulated super-precision clock, PLL ultra-low jitter technology, and a new circuit board construction. All of this highly sensitive componentry is housed in anti-vibration casing, with separate aluminum panels for the top, front, and sides. In keeping with the zero-tolerance approach to interference, digital circuitry and analog circuitry are physically separated, and you have the choice of operating the C-7000R in either digital-only or analog-only mode. The silent disc mechanism and solid die-cast aluminum tray epitomize the unit’s audiophile build quality.
Special Features
DIDRC (Dynamic Intermodulation Distortion Reduction Circuitry)
Thermally Regulated Super-Precision Clock
PLL (Phase Locked Loop) Ultra-Low Jitter Technology
Separate TI Burr-Brown 192 kHz/24-Bit DACs (PCM1792 x 2) for L/R Channels
Amphenol AES/EBU Balanced Digital Output


Specifications
Frequency Response: 2 Hz-20 kHz
S/N Ratio: 116 dB
Audio Dynamic Range: 100dB
THD (Total Harmonic Distortion): 0,0015%
Audio Output
Optical: 22,5 dBm
Coaxial: 0,5 Vp-p/75 ohms
AES/EBU: 3,3 Vp-p/110 ohms
Rated RCA Output Level and Impedance: 2.0V(rms)/330 ohms
Power Supply: AC 120 V, 60 Hz
Power Consumption: 21W
Standby Power Consumption: 0,2 W
Dimensions (W x H x D):

17-1/8" x 3-7/8" x 12-7/16" (435 x 99 x 315.2 mm)
Weight:26.5 lbs. (12 kg)

Grundig Audiorama 7000 HiFi

The Audiorama speaker system has a nominal impedance of 4 Ω and can therefore be connected to the correspondingly marked sockets of any Grundig amplifier or radio tuner amplifier. If you shouldwant to connect the Audiorama speakers to instruments of other makes, please make sure that the nominal output impedance of these latters is not higher than 5 Ω as to avoid damage of the output transistors of these instruments.

Due to the fact that the Audiorama speakers are beaming in all directions, little restriction is placed on the positioning of the speakers and the listener may be seated almost anywhere in the room without impairing the stereo effect. You only should assure that the distance between the speakers is between 2 and 4 meters, according to the size of the room. At larger or smaller distances the stereo effect may be impaired.

Technical Data Audiorama 7000

Loudspeakers: 4 woofers, 8 tweeters

Volume: approx. 11 litres

Music power: 70 W

Nominal power: 50 W

Frequency range: 45 - 20,000 Hz

Impedance: 4 ohms

Crossover frequency of built-in filter: 3500 Hz

Firmly fixed connecting cable, plug acc. to DIN 41 529: approx. 6 m long, with

Diameter of speaker ball: approx. 310 mm

Height of speaker stand: approx. 550 mm

Full lenght of chain: approx. 930 mm

Weight of speaker ball (without stand and chain): approx. 13,5 kg

Grundig Audiorama 4000 HiFi

The Audiorama speaker system has a nominal impedance of 4 Ω and can therefore be connected to the correspondingly marked sockets of any Grundig amplifier or radio tuner amplifier. If you shouldwant to connect the Audiorama speakers to instruments of other makes, please make sure that the nominal output impedance of these latters is not higher than 5 Ω as to avoid damage of the output transistors of these instruments.

Due to the fact that the Audiorama speakers are beaming in all directions, little restriction is placed on the positioning of the speakers and the listener may be seated almost anywhere in the room without impairing the stereo effect. You only should assure that the distance between the speakers is between 2 and 4 meters, according to the size of the room. At larger or smaller distances the stereo effect may be impaired.

Technical Data Audiorama 4000

Loudspeakers: 2 woofers, 2 tweeters

Volume: approx. 7 litres

Music power: 40 W

Nominal power: 25 W

Frequency range: 45 - 20,000 Hz

Impedance: 4 ohms

Crossover frequency of built-in filter: 2,500 Hz

Firmly fixed connecting cable, plug acc. to DIN 41 529: approx. 6 m long, with

Diameter of speaker ball: approx. 250 mm

Weight of speaker ball (without stand): approx. 6,8 kg

Indiana Line Tesi 242


Tesi 242 is a compact bookshelf loudspeaker, it is characterized by the remarkable definition and naturalness in the voice reproduction, with fast and very accurate transient response. The woofers feature special polypropylene cones made stiff by mica and central phase plugs in order to improve response and dispersion at the medium frequencies.
The tweeters use very light silk dome, powerful neodymium magnet and an exclusive rear chamber.





Specifications
speaker system:  2-way, bass-reflex
suggested amplifier:  30 ÷ 80 watt
amplifier load impedance:  4 ÷ 8 ohm
frequency response:  58 ÷ 22000 hertz
sensitivity:  90 dB (2.83 V / 1 m)
woofer diameter:  120 mm
tweeter dome diameter:  26 mm
crossover frequency:  2700 hertz
dimensions:  135 x 230 x 195 mm
 weight:  2.5 Kg
finishes:  black or white high gloss finishing

Maruni Headphones

MARUNI JAPAN HEADPHONES

HV-215V e HV-230V Professional Series

,,quello che ti piace ascoltare, ascoltalo più forte (anche quando gli altri dormono) e più chiaro''


La tecnologia e l'esperienza MARUNI in una serie di modelli di cuffie stereo dinamiche ed elettrostatiche

di eccezionale sensibilita e leggerezza ad un prezzo limitato. Per ascolto della musica, della voce, anche

a livello professionale.

H.H. Scott 710-A (1955-60)

Radically new mechanical design virtually eliminates acoustic feedback.

Convenient pushbutton selectio of 33-1/3, 45 and 78 rpm speeds.

Individual vernier speed controls to permint matching the pitch of accompaying musical instruments.

Built-in expanded scale optical stroboscope for exact speed control, while record is actually being played.

Torsional and dual stage mechanical filtering reduce rumble to 60 dB below the recording level,

wow and flutter to less than 0,1% all far below audibility.


The 710-A is actually far more than just a high-performance turntable. It is an integrated system incorporating complete facilities for pickup arm mounting with scientifically designed vibration isolation. At its moderate price it represents an outstanding value featuring unique beauty, operating convenience, simplicity of installation and unsurpassed performance.

The radically new mechanical design of this professional turntable reduces annoying disturbances such as motor rumble, "wow" and flutter to limits so low as to be inaudible and virtually unmeasurable. This is possible through the use of unique dual-stage mechanical vibration filtering and high compliance torsional filtering. A significat design contribution is the rigid connection of the integral pickup-arm mounting board to the turntable bearings through a heavy aluminum casting. This prevents acoustic feedback and other undesirable results of vibration differences between pickup arm and turntable.

Real operating convenience is provided by pushbutton selection of 33-1/3, 45 and 78 rpm speeds. Built-in expanded scale optical stroboscope with electronic peak-pulsing for extreme clarity insures precision speed adjustment even while a record is being played. Each speed is separately adjustable by ±5% to allow matching the pitch ofanaccompanying musical instrument.

The turntable board in gleaming stainless steel, can be mounted directly to a cabinet without additional vibration isolation, providing simple and convenient installation. The 710-A is a beautifully styled unit, available either with or without the handsome modern base.

VIEW OF TURNTABLE MECHANISM

  1. Expanded scale optical stroboscope, with electronic peak pulsing for greatest clarity, is visible even while the record is playing for exact speed control at all times.
  2. Precision helical drive gears, of hardened steel and nylon, for smooth silent flow of power to turntable. gears housed in an oil-filled transmission for noiseless trouble-free operation. Special clutch permits cueing turntable.
  3. High-compliance torsional filtering reduces annoying speed variations, such as wow and flutter, to less than 0,1% far below audibility.
  4. Dual-stage mechanical filtering between motor and turntable reduces motor rumble to more than 60 dB below recording level, an outstanding engineering accomplishment.
  5. Integral pickup-arm mounting board, accommodating all leading pickup-arms, is rigidly connected to turntable bearings by a heavy aluminum casting. This eliminates acoustic feedback and other undesirable vibration differences between pickup-arm and turntable.
  6. Vernier speed drive with special long-life neoprene idlers permits separate adjustments of 33-1/3, 45 and 78 rpm speeds by ±5% to match the pitch of accompanying musical instruments. Convenient push button selection of each speed and off position.
  7. heavy-duty high quality induction motor designed specially for this turntable with dynamically balanced rotor and extremelly low external hum field.

TECHNICAL SPECIFICATIONS

MOTOR RUMBLE:

Reduced to more 60 dB below the recording level, far below audibility.

WOW AND FLUTTER:

decreased to less than 0,1% of rated speed.

SPEED SELECTION:

Push button selection of 33, 45 and 78 rpm speeds.

VERNIER SPEED CONTROLS:

Each speed has its own vernier adjustment. A variation of up to ±5% may be made in the nominal speed to permit matching the pitch of accompanying musical instrument.

STROBOSCOPE:

Built-in expanded scale stroboscope permits precise speed adjustment even while record is being played. Special electronic peak-pulsing circuit insures superior stroboscope illumintion and clarity.

PICKUP ARM MOUNTING BOARD:

Mounting board made of hand-rubbed mahogany is included with the turntable and is part of the special mechanical design. The board is mounted on the same cast frame as teh turntable bearings thus minimizing acoustic feedback and other undesired effects of differential vibration between pickup and record. Mounting board is easily removed or replaced and may be easily drilled for any loading pickup arm.

MECHANICAL FILTERING:

High compliance torsional filtering and two stages of damped mechanical filtering reduce wow , flutter and rumble to limits far below audibility.

TURNTABLE:

Machined from a single five pound aluminum casting. Weight concentrated at the rim for maximum uniformity of speed. Aluminum construction eliminates possibility of magnetic pull on reluctance cartridges.

PRECISION HELICAL DRIVE GEARS:

Smooth, silent flow of power to the turntable is assured by the hardened steel worm and nylon drive gears. Gears housed in an oil-filled transmission for noiseless trouble-free operation.

OTHER CONSTRUCTION FEATURES:

Motor board covered in gleaming machine-finished stainless steel; special precision honed sintered bronze bearings used; long life neoprene idlers; all idlers disconnected with Off button depressed.

SLIP CLUTCH:

Special clutch allows turntable to be cued. Clutch also prevents mechanical shock to gear drive when unit is turned Off.

MOTOR:

heavy duty induction motor, with dynamically balanced rotor and extremaly low external hum field, designed specially for this turntable. This special motor is insensitive to the instantaneous short-term variations in line frequency which occur frequently, and it is also insensitive to changes in line voltage.

ACCESSORY BASE:

A handsome, hand-rubbed mahogany base, precut for easy installetion is available.

CABINET INSTALLATION:

The unique mechanical design makes it possible to mount the turntable board firmly to any cabinet. No special mounting springs or vibration isolators are required. The motor board is simply rigidly fastened to the cabinet. Mounting templates are supplied with the turntable.

DIMENSIONS:

Board dimensions, including pickup armmounting board: 16 x 14½. Depth from top of spindle to bottom of mechanism: 7 inches. Depth below mounting board: 4¼ inches.

POWER:

55 wtts, 105 125 volts, 60 cycle a.c.

Special model 710-A1 available for 50 cycle operation.

Akai X-150D (1969)

Superb recording capacity of the cross-field head.
All silicon transistor pre-amplifier.
Robust mechanism for absolute durability.
One whole panel and finely oil-finished wooden cabinet that matches furniture and stereo set.

These are the features of Akai's "Custom Deck" X-150D, a high capacity stereo tape deck with excellent design that will complete your Hi-Fi set.
Outstanding features
4-track stereo/monaural recording and playback (for playback, the X-150D requires external power amplifier and speakers).
3 speeds... 1⅞, 3¾, and 7½ ips (15 ips optional).
3 heads... Erase, recording/playback and bias heads (CROSS-FIELD HEAD SYSTEM).
Hysteresis synchronous 2-speed motor.
Wide CROSS-FIELD frequency response.
All silicon transistor pre-amplifier.
Shield type head for high S/N ratio.
two lever system for sure operation and robust construction.
Track selector knob for simple selection between stereo and monaural.
Automatic shut off, instant stop control.
Tape cleaner.
Equalizer for each tape speed.
DIN jack.
Stereo headphone jack input.
3-digit index counter with reset button, and VU meters.
One whole panel and finely oil-finished wooden cabinet.
Vertical and horizontal operation mode.
Universal voltage selector (from 100 V to 240 V, 50/60 cps)



CROSS-FIELD HEAD
The cross-field head created a sensation in the tape recorder market by making possible a wide range recording never before heard on any conventional tape recorder.
What is superior about cross-field recording? How does it differ from typical recording methods as far as construction is concerned?
On these, explanation is given below in sequences:
In the typical recording system, signal current and the bias current are combined together and applied to the recording head. It is well known that the purpose of bias current is to record, at high sensitivity, a signal applied on the tape with little distortion and minimizing noise generation.
However, the bias current providing such an advantage also has an undesirable character. That is the wide magnetic field of the bias current affects the recorded signal, resulting in weakening or even erasing the signal. This phenomenon is particularly noticeable at high frequencies.
In the cross-field system, the signal current is applied to the recording head while the bias current is applied to the bias head. these two heads are located in different positions as determined inter-relatively, so that the magnetic field of the bias will not affect the signal recorded on the tape, even when sufficient bias is applied. This allows teh recorded signal to remain on the tape with high fidelity.




SPECIFICATION
Tape speed: 1⅞, 3¾, and 7½ ips (15 ips optional)
Wow and Flutter:
Less than 0,12% (RMS at 7½ ips),
less than 0,15% (RMS at 3¾ ips),
less than 0,20% (RMS at 1⅞ ips)
Frequency Response:
30 - 9,000 Hz ±3 dB at 1⅞ ips,
30 - 18,000 Hz ±3 dB at 3¾ ips,
30 - 23,000 Hz ±3 dB at 7½ ips
Signal to Noise Ratio: Better than 50 dB
Input Level: MIC (more than 0,5 mV), LINE (more than 60 mV)
Output Level: 0 VU (1,23 V RMS)
Equalization: Correct equalization for playback of tapes recorded to the NAB curve.
Recording Bias Frequency: 60 kc
recording Level Indicator: VU meter x 2
Recording Sytem: CROSS-FIELD bias system, 4-track stereo/mono system
Fast FF and Rewind Time: 90 sec. using 1,200 feet tape at 50 cycles, 75 sec. at 60 cycles
Max. Recording Time:
8 hours monaural recording at 1⅞ ips (1,200 feet recording tape),
4 hours stereo recording at 1⅞ ips.
Head:
Recording playback head (4-track stereo/monarual, low impedance 1,000 ohms at 1,000 cps),
Bias head (4-track stereo, low impedance 500 ohms at 60 kc),
Erase head (4-track stereo, low impedance 300 ohms at 60 kc).
Motor: Hysteresis synchronous 2 -speed motor
Transistor: 11 silicon transistor, 2 diode, 2 rectifier.
Power Supply: AC 100 yo240 V, 50/60 cycles
Power Consumption: 55 VA
Dimensions (H x W x D): 13½ x 13½ x 9 inches, (340 x 340 x230 mm)
Weight: 30,8 lbs, (14,0 kg)








SIARE Loudspeakers GA 200

A loudspeaker 20 cm ( 22 SPCH ) equipped with a coil at high heat dissipation and large diameter.

A dome tweeter SIARE TWG for high return at the same time a very high quality in high frequency.

Tweeter TWG has all the characteristics of TWK with a lower resonant frequency, a response curve and power more extensive. Allows you to adapt to all types of speakers. A system of internal damping can finally get a response curve very linear in all the extension of the high range.


Diameter: 110 mm

Oppening baffle: 66 mm

Induction flux: 13,000 gauss

Bandwitch: 3,5 -20 kHz

Resonance frequency: 1 kHz

Power rating: 60 (5,000 Hz)

Volume:

Impedance: 8 ohms

Sensitivity: 90 dB 1W/1m

Rated output power: 40 W

Input impedance: 8 ohms

Modulus value of impedance: ≥ 6.4 ohms

Power / 94 dB: 5 W / m

Frequency response: 50 - 22,000 Hz, ± 4 dB

Electric power corresponding to a spatial acoustic pressure of 1 Pa: 5 W, BR 1m

THD ratio:

125 - 1000 Hz: <3%

1000 - 4000 Hz: <1%

Weight: 8 kg

Akai AT 2450 (1978)

FM TUNER SECTION

Frequency Range: 87,5 MHz to 108 MHz

Sensitivity (IHF): 1,7 μV

Capture ratio: 1,2 dB

Selectivity (IHF): More than 80 dB

Image Rejection: More than 90 dB (98 MHz)

IF Rejection: More than 100 dB (98 MHz)

Spurious Rejection: More than 100 dB (98MHz)

AM Suppression: 55 dB

Signal to Noise Ratio: 75 dB

Harmonic Distortion:

Mono: less than 0,15% (100% modulation)

Stereo: Less than 0,2% (100% modulation)

Muting: Level Control (1 μV to 100μV)

Stereo Separation: More than 45 dB (1 kHz)

Sub Carrier Suppression: More than 65 dB

Output Voltage: Controllable from 0 mV to 2,0 V (100% modulation)

Fixed: 0,77V (100% modulation)

Antenna Input Impedance: 300 ohms balanced, 75 ohms unbalanced

AM TUNER SECTION

Frequency Range: 520 kHz to 1,605 kHz

Sensitivity (IHF): 100 μV/m (bar antenna), 15 μV (external antenna)

Selectivity (IHF): More than 30 dB

Image Rejection: More than 50 dB (1,000 kHz)

IF Rejection: More than 40 dB

Signal to Noise Ratio: More than 55 dB

Output Voltage: Controllable from 0 to 2 V

Antenna: Built-in ferrite bar antenna

MISCELLANEOUS

Semi-Conductors: Transistors: 9, Diodes: 14, FETs: 1, ICs: 4

Power Requirements: 110/220/240 V, 50 -60 Hz Switchable

Dimensions: 440 x 144 x 368 mm; (17,3 x 5,7 x 14,5 inches) (W x H x D)

Weight: 7,3 kg (16,1 lbs)

Audio Analogue Rossini VT CD Rev 2.0


Even if the Rossini CD Player REV2.0 has the same look of the previous revision it is completely different inside.
With the REV2.0 we have created a unit where vacuum tube technologies and the best digital technologies have been perfectly mixed together. The circuits we have used are the result of a long period of research, especially for the original vacuum tube output stage that is the strong point of this CD player. The results we have had have been even higher than what we were originally aiming for. In particular the listening sessions showed that the Rossini CD Player REV2.0 has a different and original sound compared to other CD Players.
The Rossini CD Player REV2.0 represents a new starting point because it has demonstrated that the union of vacuum tube and the most modern technology has a promising future. We must go down new streets, try new circuital solutions, and revise the old configurations without falling into the mistake of too much a microelectronic approach.

Digital Input
The S/PDIF signal is taken from the Cd Mechanism. We have used a CD ROM mechanism specifically developed for the audio application (We even contributed to the design for the firmware test part and for the mechanical stability tests). In fact the maximum speed has been reduced compared to the standard CD ROM mechanisms, and the reading procedure has been made more Jitterless and sturdy. To avoid any interference from ground returns we have isolated the S/PDIF CD mechanism output from the main board by a transformer. The SPDIF signal is then send to the DA conversion PCB.
Digital Analog Conversion Section
The circuits performing the digital to analog conversion are placed on a board physically separated from the main board. Thats to avoid any interference on the analog signals due to the return currents of the digital parts of the DAC and transceiver. On the board there are: the transceiver, the DAC and all their frameworks including their power supply voltage regulators and capacitors. The voltage for the DAC board is obtained by a dedicated secondary of the transformer and a dedicated voltage regulator. The regulated voltage is then filtered by a RC filter. Then that voltage is used to produce the voltages for the transceiver and DAC by two voltage regulators. The components on the DAC board are predominantly SMD reducing the length of traces carrying high frequency signals to avoid irradiation effects. From the conversion board the voltage DAC output is sent to the main board.
Output Stage
The output stage is an original circuit designed by the Audio Analogue R&D office to emphisize the sound propertyes of the vacuum tube and to take vantage of the solid state technology. It is an inedited DC coupled low feedback three stage structure where the vacuum tube is the first one. The amount of feedback has been choosen not only on the base of measurements but on the base of listening tests too. What we have tried to do is a balance of the vacuum tube “coloring” and DAC “cleanliness”. The output stage’s gain is such that we have 1.9Vrms output for a 0dBV track.
Anodic Power supply
The output stage used is not based on a differential input so the noise on the anodic supply is not reduced by the circuit. Thats why we have worked on the anodic power supply to make it as clean as possible. The voltage for the anodic power supply is obtained by a high voltage dedicated secondary and then regulated with a discrete components voltage regulator. The regulator output is then filtered by a RC filter with a very low time constant (less then 1.24).

SPECIFICATIONS
D/A Section
TransceiverAK4114 192KHz/24bit - Asahi Kasei
DACAK4395 192KHz/24bit - Asahi Kasei
Total Harmonic Distortion  (at 1kHz 0dBFs):  less than 0,001 % (Band limits 0Hz-22KHz )
Total Harmonic Distortion  (at 1KHz, -10 dBFs):  less than 0,006 % (Band limits 0Hz-22KHz )
Noise Level-120 dBV (Band limits 0Hz-22KHz )
Output Level2,00 (Maximum RMS voltage output value )
Digital OutputCoaxial
Vacuum Tube Output Stage
Unbalanced Output
CD Mechanism:  TEAC CD-5010A
Dimensions (H x W x D):  78 x 444 x 371 mm (3,1" x 17,5" x 14,6")

Weight:  10,6 kg (23,4 lbs)