31 July 2018

Technics SE-A3 / SU-A4 - Professional Series DC Power Amplifier

Professional Series DC Power Amplifier

The Technics SE-A3 power amplifier introduced in 1980 employs a New Class A circuitry that makes it something special. New Class A is a unique Technics design that provides the distortion-free fidelity of class A amplifiers and the high power efficiency of class B (or AB) amplifiers. The SE-A3 delivers a rated output of 200 watts per channel, both channels driven into 8 ohms, with no more than 0.002% total harmonic distortion from 20 to 20,000 Hz. Signal-to-noise ratio is 123 dB (IHF '66) and TIM is so low that it is unmeasurable. Although these specifications speak for themselves, the New Class A circuitry eliminates the switching distortion and crossover distortion that are characteristic of conventional amplifiers with the use of the original "synchro bias" circuit. To eliminate chances of cross-channel interference the SE-A3 is equipped with separate transformers for the left and right stereo channels. To complement the overall aesthetics this power amplifier uses large Peak Power Meters that have an attack time of only 50us and give direct readings from 0.0001W to full power. We can almost consider this a Technics trademark. Unfortunately rumour is that there are two types of Technics SE-A3, one that is broken while the other one will be soon broken. The good news however is that the special DLPT symmetrical configuration dual transistors can be replaced with two independent Toshiba power transistors.

Professional Series DC Power Amplifier

Professional Series DC Power Amplifier

Professional Series DC Power Amplifier

Professional Series DC Power Amplifier

Professional Series DC Power Amplifier

Professional Series DC Power Amplifier

23 July 2018

Technics SL-15 - Program it to play any cut (1980)

Program it to play any cut

The Technics is a high-tech Direct Drive linear-tracking turntable. It automatically plays the record selections you want and skips the ones you don't. It completely eliminates tracking error and is so advanced it can even play upside down. The SL-15's microcomputer and infrared optical sensor let you play up to 10 cuts per side, in any order. Just press the program keys in the order of the selections you want to hear. And with the repeat button, the SL-15 can repeat the entire program or any selection. The SL-15 performs virtually any function, automatically. It accurately selects the record size and speed, finds the lead-in groove and begins playback at the touch of a button. 

More proof of the SL-15's accuracy is its quartz-locked, direct-drive motor and dynamically balanced, linear-tracking tonearm. In addition to tracking perfectly, the SL-15 plays a record as accurately upside down as it does right side up. The whole body of the truntable is made of precision aluminium diecast upper and lower interlocking cabinet halves. The same build quality can be found also in the Technics SL-10 (a member of the 1001 Hi-Fi collection). 

You can see how it's been "scientifically demonstrated" that this Technics can really

Program it to play any cut

Program it to play any cut

Program it to play any cut

Program it to play any cut

Program it to play any cut

Program it to play any cut

Program it to play any cut

Program it to play any cut

Program it to play any cut

Program it to play any cut



17 July 2018

EXCLUSIVE M3 - Power Amplifier by PIONEER (1973)

Power Amplifier by PIONEER (1973)

The "soul of audio" combined with the advanced art of high fidelity electronics is behind the unique concept of the EXCLUSIVE M3 stereo power amplifier by Pioneer. Analyses of both the "dynamic" and the "pulsive" characteristics of audio were studied carefully in the creation of the M3. These include transient response, crossover distortion and many other critical aspects of performance. Such static characteristics as power bandwidth and frequency response were also closely examined. The results are as brilliant as they are daring. To illustrate, consider the problem of providing stability versus the question of assuring wide frequency response and minimum distortion. Pioneer designed an entirely new type of circuit for the M3 to achieve both: it features the reliable circuit design and high quality parts for stability, yet allows a small amount of negative feedback to be applied to improve frequency response and assure low-distortion performance. 

Sophisticated features like peak-power level meters, a front sub-panel providing access to speaker selector and function of the M3. Individual technical-data sheets giving the exact test information for each unit is packed with every M3 as it leaves the Pioneer factory. The EXLUSIVE M3 is the perfect blend of technology and musicality, the stereo amplifier you can depend on to deliver the "soul of audio" without compromise. As a quality power amplifier for musical reproduction, the M3 has no peer. It offers you RMS 150 watts+150 watts of continuous power (both channels driven at 8 ohms) within critical 20-20,000 Hz frequency range, with both harmonic and intermodulation distortion held to less than 0.1%. There are two large, very precise peak power level meters on the front panel of the M3. The peak transient levels as high as 20dB contained in any audio signal are indicated instantly and acurately. Compared with ordinary VU meters, the power indication range of this peak meter is exceedingly wide: 0.01W to 200W on a logarithmic compression scale, operating from built-in circuits, thus, you can read the power level without changing meter sensitivity.

Power Amplifier by PIONEER (1973)

Power Amplifier by PIONEER (1973)

Power Amplifier by PIONEER (1973)

Power Amplifier by PIONEER (1973)

PIONEER (1973)

PIONEER (1973)

PIONEER (1973)

Power Amplifier by PIONEER (1973)