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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
LEAK Delta 70 (1972)
Onkyo Reference Series (80's-Styled Separate Hi-Fi Components)
Onkyo P-3000R
Onkyo M-5000R
Onkyo C-7000R
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
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)
- 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.
- 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.
- High-compliance torsional filtering reduces annoying speed variations, such as wow and flutter, to less than 0,1% far below audibility.
- Dual-stage mechanical filtering between motor and turntable reduces motor rumble to more than 60 dB below recording level, an outstanding engineering accomplishment.
- 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.
- 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.
- heavy-duty high quality induction motor designed specially for this turntable with dynamically balanced rotor and extremelly low external hum field.
Akai X-150D (1969)
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)
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)