Showing posts with label AMPLIFIER. Show all posts
Showing posts with label AMPLIFIER. Show all posts

29 May 2021

TRIO KENWOOD 700 Line (1973) - Distinguished Performers

stereo amplifier

Formed in 1946, the Trio Corporation has gained an enviable reputation for its development and manufacture of high class equipment. For those sophisticated audiophiles who can appreciate the 0.0024% tuning accuracy of the 700T Frequency Synthesizing Tuner ... the exceptional control flexibility of the 700C Preamplifier-Control ... the masterful power of the 700M Main Amplifier with its incredible 170 watts per channel Min. RMS (at 8 ohms, 20 to 20,000 Hz with no more than 0.1% total harmonic distortion) ... Trio-Kenwood proudly presents the 700 Series. Each boasts technical specifications well beyond any previous efforts. Each incorporates the most advanced electronics, the most imaginative design concepts. Together they go beyond state-of-the-art performance and come closer to realizing total fidelity by producing a range of realistically priced high grade equipment that is among the best on the world market. During it's 6 years of manufacturing the 700 Series was sold under TRIO, TRIO Supreme and KENWOOD badges. Priced approximately 2150 USD (1975)

stereo amplifier

stereo amplifier

stereo amplifier

stereo amplifier

stereo amplifier


20 March 2021

Accuphase P-800 (1988) - Balanced Stereo PowerAmplifier

power amplifier

The Accuphase P-800 is a Balanced Stereo PowerAmplifier. Completely balanced powerful output stage consisting of two sets of 7 parallel push-pull transistor pairs, outstanding low-impedance drive capability, separate power supplies for left and right channels, balanced input.

The impedance of loudspeakers on the market varies considerably, ranging from about 2 ohms to 16 ohms. With a direct-coupled amplifier, driving such a wide impedance range with equal aplomb is almost impossible. An output stage designed for optimum performance at 2 ohms will deliver less power into 8 to 16 ohms. Conversely, the performance of an amplifier optimiozed for about 4 to 8 ohms suffers at 2 ohms and it will not be capable of driving 1-ohms loads. The P-800 incorporates a special design to deal with a wide range of load impedances. The applied voltage of its output devices can be switched to a lower value, to provide the high current capability required by low-impedance loads. This results in a truly amazing guaranteed rating of 600 watts into 1 ohm and 400 watts into 2 ohms, with undiminshed sound quality. To achieve such stunning performance the output stage of each power unit employs two sets of seven parallel push-pull pairs of wide-band transistors with a maximum power dissipation of 130 watts each. This amounts to 14 pairs or 28 transistors per unit, totaling a maximum powe dissipation of 3,6 kilowatts. These truly astounding figures testify to the no-holds-barred Design approach of the P-800.

To let you monitor its performance, the P-800 incorporates two symmetrically arranged analog level meters. The output meters are large analog meters symetrically arranged. They can directly read the output power in decibel units over a range as wide as from -60(0.0004 watts/8ohm) to+3 (800 watts/8ohm) dB. The meters can be activated and deactivated ot the illumination of the meters can be turned on or off by a switch. Except for the power switch, all controls are located behind a hinged subpanel door in the lower section of the front panel. The panel is finished in brushed gold aluminium, giving the P-800 an appearance of simple elegance. The visual appeal of the amplifier is further enhanced by the side panels made of exquisite persimmon-wood.

The beautiful and simple elegance of this amplifier's external appearance belies its awesome performance. But when turned on, it speaks unmistakably through music. Technical data: Continuous Average Power Output (20 to 20,000 Hz) Normal load operation (THD 0.01%) 600 W/ch 4 ohm, 400 W/ch 8 ohm, 200 W/ch 16 ohm | Total Harmonic Distortion 0.01% with 4-16 ohm load | Frequency Response: 20 to 200,000 Hz +/-0dB for rated output |  Damping Factor: 200 | Signal to Noise: 125 dB | Dimensions: 481*239*489 mm | Weight: 47.2 kg. 


power amplifier

power amplifier

power amplifier

power amplifier

14 March 2021

PIONEER M-22 (1978) - Series Twenty Class-A

 

stereo power amplifier

The culmination of PIONEER's creative design can be heard with the esoteric Series Twenty Class-A components which achieve the exceptional warmth and presence of valve-type amplifiers without the drawbacks of the old designs. The Series Twenty was launched in 1978 to prove just how "high" fidelity could really reach if the cost factor is eliminated. The PIONEER M-22 is operating strictly in the Class-A mode. Admittedly low on efficiency (watts of output per power input) but unbeatably high on performance. The M-22 obtained the highes compliment when the British journal Practical Hi-Fi said the amplifier "can be regarded as the classic straight wire with gain" Technical data: 30 W/ch min. RMS at 8 ohms, from 10 to 30000 Hz Dimensions (WxHxD) 420x153x370 mm, Weight: 22 kg. Partnering components are the U-24 Stereo Programme Source Selector, C-21 Stereo Preamplifier, D-23 Multi-Amp Electronic Crossover Network.

stereo power amplifier

stereo power amplifier

stereo power amplifier

stereo power amplifier



03 October 2020

STAX DA-300 (1974) - Pure Class-A

power amplifier

The STAX DA-300 is a high powered Class A amplifier introduced in 1974. Its basic design concept is to realize the equation "Input=Output" in sound quality when the audio signal passes through the equipment. Advanced engineering and much effort in scrutinizing related parts succeeded in maintaining the total harmonic distortion less than 0.02% and in reproducing remarkably fidel and excellent sound. With its proven static and dynamic characteristics, the DA-300 is superbly compatible with such worl-renowned ludspeakers as JBL, Altec, AR, Tannoy, etc. as well as Stax electrostatic loudspeakers. All protective circuits, such as protecting the amplifier from excess voltage input, abnormal DC flow, or overheating, and protecting loudspeakers in case of the amplifier failure, are cleverly engineered into the system. 

DA-300   Amplification that was only a dream until now. The world's finest power amplifier. Ask anyone who has heard it on the world's finest speakers. 150 watts RMS/ch pure class A power. Large, heavy, full features and protection circuits. $3,600.00 (... said the advert from 1976 ...)
Aparently the matching pre-amplifier shown was only a prototype.

power amplifier

power amplifier

power amplifier

power amplifier


For more vintage audio visit www.1001hifi.com

04 September 2020

LUXMAN C-02/M-02 - Status Series (1982)

power amplifier

Over the years, Luxman's strenght in engineering excellence has always been most evident in amplifier design. The M-02 utilize discrete output transistors and maintain high dynamic power even into low impedance loads. Lux's innovative circuitry "Duo-Beta" meant skillful utilization of 2 kinds of NFb. (Optimum Negative Feedback and DC Subsonic Negative Feedback) A slim but effective power transformer with outstanding regulation and far better efficiency than those with the conventional EI core is used for solid bass sound. Unprecedented speedy attack and decay are given in the actual auditory feelings thanks to the unique bias current circuit emplying LED's in lieu of normal diodes. The BTL selector switch provided makes it possible to take out an astounding monaural 320W into 8-ohm loads. Liquid-Cooled heat sink and Peak-Reading power meters with separate channel attenuators complete this very successful model. (LUXMAN M-02: 150 W/ch 8 ohm with no more than 0.015% THD, Frequency Response 10Hz-100kHz, 453*336*141 mm, 14.5kg)

power amplifier

power amplifier

power amplifier

power amplifier

power amplifier

power amplifier


09 May 2020

Fine Arts Esoteric Line CD tube pre-amplifier (1987) - ... by Grundig

pre-amplifier

Grundig's first product manager, Dr. Burkhardt Schwäbe was the driving force behind the Fine Arts Series. It was meant to demonstrate Grundig's expertise in the premium Hi-Fi segment. The Fine Arts Esoteric Line CD tube pre-amplifier was created in 1987. It's main design features are a complex power supply with toroidal transformer, electronically controlled DC voltage heating, double volume control (from ALPS) and four E83CC tubes from Siemens. Originally it was planned to use Telefunken ECC83s but those were unavailable at that moment. There are inputs for CD, Tuner, DAT/Tape and Aux (no Phono input) and can be used with a wide range of transistor or tube amplifier. The gold version has 24 carat gold-plated surfaces and there were built a total of 127 units. Dimensions: 310 x 124 (+11) x 220 mm.

Towards the end of the 1990s Dr. Burkhardt Schwäbe moved to Sennheiser and in 2004 he launched his own brand, Eternal Arts and more recently Eternal Masters (pre-recorded tapes and audiophile LP).

pre-amplifier

pre-amplifier

pre-amplifier

pre-amplifier

pre-amplifier

pre-amplifier

14 March 2020

SONY TA-N77ES (1988) - Digital to Analog

amplifier

Introduced in 1988 the SONY TA-N77ES was the only power amplifier ever from SONY to support large VU meters as a visual element. ​Power amplifiers are usually tested when hooked up to 8-ohm laboratory resistors. While results may look fine on a spec sheet, they simply ignore an undeniable fact. Real loudspeakers - even those nominally rated at 8 ohms - simply refuse to behave like laboratory resistors. While the resistor presents a simple impedance that's constant at all audio frequencies, the speaker presents a complex impedance that varies dramatically. A typical "8-ohm" loudspeaker can have impedance peaks higher than 30 ohms and impedance dips lower than 3 ohms! And here's the catch: as impedance drops, more and more current is demanded from the amplifier. 

Thanks to large power transformers, generous power supplies, big output transistors and massive heat sinks, the SONY TA-N77ES produce this current in casual disregard of loads. In preference to inexpensive integrated circuit "power packs" SONY ES insists on individual (discrete) output transistors. Sony's carefully-selected discrete transistors cost more, but their enhanced cooling, proven reliability and superior frequency response make them more than worth the cost. To reduce resonance and vibration Sony used a G-Base made of calcium carbonate reinforced with glass fibers, a unique compound similar in composition to marble. To accompany the SONY TA-N77ES power amplifier there were two remote controlled preamplifiers, the SONY TA-E77ES and the TA-E77ESD with added Digital inputs. Technical data: 200 W/ch 20-20,000 Hz 8 ohm THD 0.004% Dimensions: 470 W x 185 H x 440 D mm, Weight: 25 kg.


amplifier

amplifier

amplifier

amplifier

07 March 2020

ONKYO Grand Integra M-510 (1984) - Artistry in Sound

power amplifier

Introduced in 1984 the Grand Integra M510 was the biggest stereo amplifier built for home use by ONKYO. The M-510 has completely separate L/R channels all the way back to the power switch and AC cord. Each channel's power supply has two power transformers: one BIG toroidal unit with tremendous power capacity, and an "in-phase" transformer - which smooths out fluctuations in the charging currents. AC from the transformers is converted to DC by high-current rectifiers, and each channel has two massive 33,000 microfarad 100 volt filter/storage capacitors. A third, independent power supply provides DC energy for the front panel lights, protection circuitry and speaker relays. Meter sensitivity can be switched from normal to -10dB to get meaningful readings even at low power levels. The design is complemented with genuine wood side panels. No specifically matching preamplifier was built. Technical data: 300 W/ch (20Hz - 20 kHz 8 ohm) Dimensioms: 507x264x512 mm Weight 63 kg.

power amplifier

power amplifier

power amplifier

power amplifier

power amplifier

power amplifier

power amplifier

power amplifier

08 November 2019

AKAI DA-P9500 / DA-A9500 (1989) - The 60th Anniversary Model.

digital amplifier

To celebrate it's 60th anniversary AKAI created in 1989 a dream amplifier (sold as A&D in Japan). It was a 60 units limited edition Digital pre-power amplifier. Out of the 60 units made, 30 were sold in Europe. The AKAI DA-P 9500 pre-amplifier acts like a Digital Controller where the analog signal is converted to digital and the signal is transmitted in digital format to the power amplifier. There are 12 analog inputs, 4 digital coaxial and 4 digital optical. There is rec-out for tape, 2 vcr and 2 digital. The pre-amplifier has a digital parametric equalizer that can be controlled via the 2 way system remote. EQ settings can be easily visualized on the two way remote controllers display. Dimensions: 466x154x445 mm Weight: 19 kg
The AKAI DA-A 9500 is a 200 w/ch (FTC 20-20000Hz 8 ohm) power amplifier that has a built in D/A converter and can be used as an independent unit for digital sources and it can be controlled with it's own remote control. Dimensions: 466x214x498 mm Weight: 35 kg

digital amplifier

digital amplifier

digital amplifier

digital amplifier

digital amplifier

digital amplifier