11 February 2025

DENON DCD-1610 (1988) | 20bit S.L.C.

 

DENON DCD-1610 (1988) | 20bit S.L.C.

The DCD-1610 is a CD player equipped with a real 20 bit super linear converter. Unlike dynamic bit shift converters that use attenuators and switching circuits, this Real 20-bit converter has no nonlinear distortion factor, and the 0 cross distortion, which is a problem at low volume, is caused by the resistance error of the MSB, the most influential bit in D/A conversion. Therefore, the distortion is eliminated by correcting this MSB. In addition, a 2D/A system with independent left and right channels has been adopted to eliminate the L/R time difference. The digital filter uses an 8 x oversampling digital filter. By increasing the sampling frequency by 8 x, the band gap between the music signal and the noise signal is widened, making it easier to remove noise components. This allows the use of lower-order analog filters to improve sound quality. The power supply circuit consists of five independent power supplies. One digital section, one pickup servo system, one display system, and two audio systems are supplied separately to prevent sound quality degradation due to mutual noise and voltage fluctuations. A linear motor pickup is used for the pickup mechanism to enable high-precision tracing. The pickup mechanical base is made of BMC (Bulk Molding Compound), which has high rigidity and excellent vibration damping characteristics. In addition, this mechanical base is made into a double floating structure with low-repulsion rubber and spring to increase the vibration absorption effect. The unique double chassis structure with inner and outer chassis prevents external vibration, increases rigidity and eliminates resonance. In addition, the bottom surface is covered with another reinforcing rigid metal from the outside of the external chassis to increase vibration isolation. In addition, vibration from the top surface is suppressed by adopting large auxiliary rigidity metal for the top plate and inserting anti-vibration material below the top cover. Wireless remote control is included.

DENON DCD-1610 (1988) | 20bit S.L.C.

DENON DCD-1610 (1988) | 20bit S.L.C.

DENON DCD-1610 (1988) | 20bit S.L.C.


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10 February 2025

YAMAHA NS-1200classics (1987)

 

YAMAHA NS-1200classics (1987)

Released by Yamaha in 1987 the NS-1200classics features a 30cm diameter cone type woofer, a pulp cone rather than the new materials such as cross carbon that were mainstream at the time. In keeping with Yamaha's style, spruce wood was used as the raw material. Spruce is often used for piano soundboards, and is said to have a beautiful sound. Yamaha chose spruce from among the various trees in the world, and after much effort, completed an original 100% spruce pulp cone for the company's famous NS-690III in 1980. The woofer of the NS-1200classics inherited that technology. The magnetic circuit that drives the woofer uses an alnico magnet. The squawker was equipped with an 8 cm soft dome type unit. This soft dome unit was made of cotton as the base material, impregnated with phenolic resin, and thermoformed, achieving beautiful mid-range reproduction with excellent reproduction of acoustic instruments. The squawker's magnetic circuit used an internal magnet type with an alnico magnet, just like the woofer. The tweeter was equipped with a 3cm soft dome type unit. It was made of the same material as the squawker. In addition, the magnetic circuit was also an internal magnet type with an alnico magnet, like the woofer and squawker. The cabinet was a sealed type, heavy and sturdy, with a total weight reaching 42kg. All five sides except the back were finished with natural American walnut boards, with a mirror finish with urethane gloss paint, giving it a beautiful and calm appearance design. In addition, a dedicated speaker stand SPS-1200 was available separately.

Technical data:
Format: 3-way closed type
Speakers:
30cm cone woofer
8cm soft dome squawker
3cm soft dome tweeter
Crossover Frequency: 400Hz (12dB/oct) 4kHz (12dB/oct)
Frequency response: 40Hz to 30kHz
Impedance: 6 ohms
Input Power: 75W
Music Input Capacity: 150W
Output Sound Pressure Level: 88dB/W/m
External dimensions: 375W x 740H x 380Dmm
Weight: 42kg


YAMAHA NS-1200classics (1987)

YAMAHA NS-1200classics (1987)

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06 February 2025

DENON PMA-1010D (1987) | Digital - Class A

 

DENON PMA-1010D (1987) | Digital - Class A

The PMA-1010D from Denon is a pure A-class pre-main amplifier with built-in D/A converter. It operates in class A up to 1W output (8 Ω) for low distortion and high quality sound. In order to cope with the temperature rise of class A amplification, the fin of the heat sink is doubled, and the block is firmly combined with a copper plate with good heat conduction and fast vibration damping, to achieve high heat resistance and no resonance. The power supply section is equipped with a large power transformer, fast recovery diode for high-speed rectification, and 48,000 μ F electrolytic capacitor for audio. Stabilization is achieved by the adoption of balanced floating power supply system. A large heat sink separates the power supply from the main signal system. The built-in D/A converter uses a 4 DA push-pull super linear converter. This converter consists of two carefully selected D/A converters for the left and right channels, each of which functions like a class A push-pull. It also consists of a four times over-sampling digital filter, a sample-and-hold circuit, and an LC-OFC 7th-order C. A. L. P. (linear-phase) low-pass filter. The digital input section consists of coaxial digital input and optical digital input systems. Equipped with a digital input selector using a high-speed C-MOS logic circuit, it automatically identifies CDs, DAT and DBS and transmits them to the D/A converter. In addition, in order to eliminate interference with the converter section, "opto-isolated" method by optical coupling is adopted. The power cord features polarity display. Technical data: Rated power 140W/ch 8ohm | THD 0.003% | Output bandwidth 5Hz-100kHz | Dimensions (WxHxD) 474x174x396mm | Weight 22kg

DENON PMA-1010D (1987) | Digital - Class A

DENON PMA-1010D (1987) | Digital - Class A

DENON PMA-1010D (1987) | Digital - Class A

DENON PMA-1010D (1987) | Digital - Class A



DENON PMA-1010D (1987) | Digital - Class A









05 February 2025

TANDBERG TCD 440 A (1980) | Actilinear & Dyneq

 

TANDBERG TCD 440 A (1980) | Actilinear & Dyneq

The TCD 440 A from Tandberg is a Top-class HiFi cassette recorder with discrete recording and playback heads. It features Tandberg's unique DYNEQ dynamic recording equalization and ACTILINEAR recording system for better signal processing with special consideration of Metal tapes. Bias level for the various types of tape can be adjusted from the front panel. The mechanism is features 3 motors, Double capstan drive, Fully electronic control of all functions via digital logic circuits. Integrated there is a precision azimuth adjustment of the recording head by integrated test generator, readable via measuring instrument. Other features include: Servo-controlled fast winding with 40-sec rewind time for C-60 cassette. Automatic end and safety shutdown for all drive functions. 4 separate Dolby units for recording and playback. Large frequency-corrected peak value display instruments for recording and playback. FM Dolby switch. 19/38 kHz multiplex switch (MPX switch); self-adapting input amplifier (according to Lia) for full dynamic range for all program sources. Input level can be set separately for each channel. Output level can be adjusted.  Headphone connection on the front panel. Mixing option for mono recordings. Vertical and horizontal operation but also wall mounting is possible. Available with silver or black anodized front panel. Wireless remote control of all drive functions using infrared technology. Remote control RC 20. Technical data: Frequency response (DIN 45500) 18-21.000Hz | Wow & Flutter 0,12% W.R.M.S. | Size (WxHxD) 465x225x100mm | Weight 6,7kg | Original sale price 1995 DM in Germany


TANDBERG TCD 440 A (1980) | Actilinear & Dyneq

TANDBERG TCD 440 A (1980) | Actilinear & Dyneq

TANDBERG TCD 440 A (1980) | Actilinear & Dyneq

TANDBERG TCD 440 A (1980) | Actilinear & Dyneq



cassette deck





04 February 2025

Lo-D DAD-001 (1985) | Purity of Sound

Lo-D DAD-001 (1985) | Purity of Sound

The DAD-001 was a pioneer of separate CD players, and was an impressive machine with excellent sound quality. This was possibly the world's first, separate CD player, Lo-D DAP-001/HDA-001. The processor HDA-001 was equipped with a 16-bit linear DA converter with independent left and right channels. The independent left and right 16-bit linear DA converter Prevents distortion that occurs when switching between positive and negative signals, which is equivalent to "switching distortion" in amplifiers. The laser pickup uses a two-axis orthogonal optical system that eliminates the effects of laser light reflection by a reflecting prism and further enhances tracking capabilities. In addition, tracking errors caused by disc eccentricity are handled by a three-spot method that detects errors by the difference in the amount of reflected light from three spots. It also contains the industry's first 5-fold correction signal LSI-equipped laser. Technical data: Number of channels - 2 channels | Frequency response: 5~ 20,000Hz ±0.3dB | Dynamic range: 97dB | SN Ratio: 98dB (IHFA) | High-frequency distortion rate: 0.0025% (1kHz) | Wow and flutter: Below measurement limit (±0.001% W. Peak) | External dimensions Player unit: width 493 x height 122 x depth 280 (mm) /7.0(kg) Processor unit: width 493 x height 122 x depth 280(mm)/7.5(kg)

Lo-D DAD-001 (1985) | Purity of Sound

Lo-D DAD-001 (1985) | Purity of Sound

Lo-D DAD-001 (1985) | Purity of Sound

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03 February 2025

SONY Accurate Pistonic Motion (1985)

SONY Accurate Pistonic Motion (1985)

The lineage of APM speakers stretches from the first model, the APM-8 of the "Esprit" series, in 1979 to the latest APM-66ES. This is the unchanging philosophy behind Sony's Hi-Fi audio - to convey music in its purest form, without any additives or loss of anything. By reproducing only the music signal, the emotion of music emerges from the APM-66ES. This APM 3-way speaker has been perfected to the next level, with an amorphous diamond tweeter, a multi-point drive woofer, and an acoustically rounded enclosure. The natural sound field and detailed depiction of instruments and vocals with their natural color and texture. The deep emotion and flavor of music is born from here. 

A 9cm² APM tweeter made from amorphous diamond, a new material that provides high resolution and crystal clear high frequencies. After years of research, Sony has succeeded in depositing this new material onto an aluminum skin material. The synergistic effect of its high sound speed value, high rigidity, and aluminum honeycomb structure has resulted in a diaphragm that has excellent transient characteristics and produces clear playback sound without any quirks, making it suitable for the digital audio era. In addition, the voice coil uses lightweight and highly efficient copper-clad aluminum edgewise wire. The magnetic circuit is equipped with the strongest strontium ferrite magnet in its class, and a magnetic fluid with high heat dissipation and damping effects is injected into the voice coil gap. It reproduces high frequencies with a high level of transparency that vividly depicts even the subtle details of music. A 48cm² APM type midrange speaker with double-sided drive that reproduces vocals beautifully and freely. The midrange is the band where the fundamental tones of musical sounds are concentrated. The quality of vocal reproduction in particular is greatly affected by the quality of the midrange. The APM-66ES also incorporates new technology here. It uses a three-layered reinforced aluminum skin material based on aluminum. This is a reinforced aluminum material with fine internal cavities that has been treated with vibration damping, which increases rigidity while also reducing internal loss. The sweet spots of the skin material in front and behind the diaphragm are driven on both sides. This has greatly improved the rise and smoothness of the sound. In addition, the magnetic circuit is designed to be low distortion with a T-shaped pole piece, a perforated yoke, and a copper cap, and is highly efficient with the largest strontium ferrite magnet in its class and an oxygen-free copper-coated aluminum edgewise voice coil. It beautifully depicts rich, lustrous vocals, as well as the color and warmth of music. In addition, by using a large back chamber and setting the lowest resonance frequency low, the transition from the mid-range to the low-range is extremely smooth. A 424cm² APM woofer with multi-point drive system produces rich, firm bass. The aluminum honeycomb diaphragm is driven by multiple armatures directly connected to the voice coil, effectively canceling split vibrations beyond the usable frequency band. This design concept has been expanded to a total of eight armatures, canceling split vibrations up to higher modes. This achieves a pistonic motion band approximately five times (compared to our previous model) that of a comparable cone-type woofer, achieving a wide, flat playback band up to 4kHz. At the same time, distortion has been significantly reduced. To fully utilize the benefits of this drive system, the woofers are equipped with a powerful magnetic circuit with a low distortion design that includes a T-shaped pole piece with excellent magnetic flux symmetry and a perforated yoke that reduces back pressure on the diaphragm. In addition, the woofers are equipped with a high heat-resistant, high-rigidity armature. 

Main specifications: Format: 3-way phase inversion type; Speakers used: 424cm² APM type for bass, 48cm² APM type for midrange, 9cm² APM type for treble; Impedance: 6ohm; Rated maximum input: 100W; Instantaneous maximum input: 200W; Output sound pressure level: 90dB/W/m; Effective frequency band: 28-45,000Hz; Crossover frequency: 600Hz, 4.5kHz; Size: 380 (width) x 660 (height) x 365 (depth) mm Weight: 27 kg
 


SONY Accurate Pistonic Motion (1985)