Technics SU-V6 amplifier

With this amplifier, you can obtain the best of both worlds. Technics' "New Class A" amplifier circuit combines class A output with stable load condition on all stages. Also, the undistorted sound quality of class-A and the efficient. High output power of class-B are available within a single amplifier. You don't have to trade efficiency and price for sound quality, or switching distortion for high output. The SU-V6's facts and figures support these claims: 70 watts per channel, both channels driven into 8 ohms, from 20 Hz to2O kHz with no more than 0,007%total harmonic distortion. The most important fact, though, is that this integrated amplifier's faithfully reproduced sound exhibits the effortless smoothness of true class-A amplification And yet all this is available at a fraction of a conventional class-A amplifier's cost.

 

New Glass A and Straight DC Provide Both Quality and Quantity

Quality of reproduced sound and quantity of output power are the two general aims we were striving to develop in the advanced circuitry incorporated in the SU-V6. To test the success of our circuit designs, we have employed a new method of analysis called 3DA (first used in the development of the SU-8099 integrated amp), which stands for "3-Dimensional Analysis." With the aid of a computer, this system enables us to test performance at 4,000 points and express the results in 3-dimensional graphic form. From our extensive research using 3DA, we have found that performance requirements within the audio spectrum are best satisfied by building amplifiers that exhibit good performance characteristics from 0 Hz (DC) at the bottom of the frequency range, all the way up to nearly 100 kHz in the ultra-high range ( it's undesirable to go much higher than this point, given currently available circuit components). To achieve performance within these considerations, we have used a number of advanced circuit configurations, the two most important of which are "New Class A" and "Straight DC."

 

New Class A with Synchro Bias for Better High Frequency Response

Transistor switching is a major cause of high frequency distortion in class B and class AB amplifier designs. ln class B designs, two output transistors are used for each channel. The "upper" transistor handles the positive  half of the waveform and the "lower" transistor handles the negative half. But problems occur when the signal crosses the zero point; one transistor turns off and the other turns on. During this crossover, "switching distortion" is  generated. This takes the form of brief pulses with very sharp peaks, which produce high-order harmonic distortion. NFB (negative feedback) does not cope with switching distortion effectively, despite its use fulness in combating ordinary forms of distortion. This switching distortion can also result in intermodulation distortion which muddies reproduced sound to a greater  degree than might be expected from a simple examination of an oscilloscope trace. In class A, the same transistor handles the entire waveform, but a large idling current is required to operate the transistor even when there is no audio input signal. Although this prevents any form of switching distortion, it also results in very low efficiency. Large heat sinks must be provided to dissipate the substantial amount of excess heat that is created. Price is corresponding high In our New Class A circuitry, the output transistor bias current is synchronized with the positive and negatives wings of the input signal so that the output transistors are always in an active state. With this remarkable circuitry, switching distortion is eliminated since the transistors are never allowed to switch off. Because of this synchronized operation, e call  his "synchro bias." Besides  preventing  switching  distortion in the output waveform, it also presents linear load conditions to the voltage amplification stage. Pre-driver load fluctuation is also minimized. The result is the virtual elimination of "crossover distortion."

 

"Straight DC" Configuration for Direct Coupling Between DC Power Amp Section and High Level Input Signals

The SU-V6's design takes full advantage of the excellent low-range frequency response, phase linearity, and low distortion inherent in our refined DC power amp design. By increasing the gain of the power amp section, we have made it possible to directly couple high level inputs, such as tuner, tape, and AUX sources, to the power amp input. The resulting improvement in low range fidelity is a good example of what can be achieved with an innovative, yet uncomplicated, approach to integrated amp design. In fact, you could view this configuration as simply a phono equalizer and a DC power amp.

While this characterizes the "simple is best" philosophy. Some additional innovations were necessary to obtain the desired performance goals. First of all, a high-gain amp is required to raise typical "high level" inputs of 150 mV- 200 mV to output levels of 70 W-100 W. Furthermore, any tendency toward  temperature dependent DC drift must be avoided since the amp's gain extends  all the way down to DC in the low range. To obtain high gain, Technics' SU-V6 amp employs a linear cascode, 3-stage Darlington configuration which provides excellent open-loop performance. As a result, only 45 dB  NFB is required to achieve the 0.007% THD rating at 70 W output. To combat DC drift, 1-chip dual FET's are used for the first stage differential amplifier. Since this prevents mutual temperature differences, DC drift is reduced to a mere ± 10 mV from -10°C to +50°C.

 

Concentrated Power Block (CPB) Prevents Distortion from Electromagnetic Induction

With the strikingly clean high range response obtained from our New Class A synchro bias circuitry, we made sure that nothing would interfere with proper performance under practical signal handling conditions. Our concentrated power block was developed to prevent electromagnetic induction between those portions of the circuitry which handle large amounts of current and those which handle smaller signals. The power supply and output stage were concentrated in one integrated unit to create the shortest possible connections. With the addition of low impedance laminated bus lines, the power supply loop was minimized. Another advantage of CPB is that it virtually eliminates significant  differences in performance between individual units. Consequently you can expect a maximum 0,007% THD for anv individual SU-V6 amp.

 

ICL Phono EQ Circuit Employing Ultra-Low Noise FETs Permits Direct MC Cartridge Connection

The first stage of the phono equalizer is a differential amplifier with ultra-low noise dual FETs. As a result, no input capacitors are necessary. A mere increase in equalizer gain, rather than an additional pre-preamp or step-up transformer, is all that is needed for MC cartridge compatibility. When the amp is in the straight DC mode, the only capacitor in the entire amp circuit, whether the input is MC or MM, is the EQ output capacitor.

 

Heavy Duty Power Supplies

In an audio amplifier the, power supply must be able to meet the changes in impedance presented by the speaker systems Depending on the frequency this figure can  range from below 4 ohms up to as high as 30 ohms for a speaker system rated at 8 ohms. In the SU-V6 independent rectifier and  ripple filter circuits are  provided for the left and  right channels to assure truly stable DC power. Furthermore the power transformer coils float in a special resin  within shielded cases to prevent power supply hum.

 

Independent Recording Selector with 2-Way Dubbing

With this versatile arrangement you can record from  one source while listening to another since the input and recording selectors are separate. Tape inputs are positioned on both the input selector and the recording selector so that you can record while listening to another source (such as a disc) if you wish.

 

Remote Action Switches Eliminate Excess Wiring

Remote action switches are employed on the input selector, recording selector, and phono selector. Therefore, switching takes place at the ideal location within the circuitry. This contributes to sound quality by minimizing the chances of signal degradation due to extensive wiring.

 

Specifications

Continuous Power Output

20 Hz - 20 kHz (both channels driven)

80 W x 2 at 4 Ω

70 W x 2 at 8 Ω

40 Hz - 16 kHz (both channels driven)

80 W x 2 at 4 Ω

70 W x 2 at 8 Ω

1 kHz ( both channels driven}

90 W x 2 at 4 Ω

74 W x 2 at 8 Ω

Total Harmonic Distortion Rated Power

At 20 Hz to 20 kHz

0,02% at 4 Ω

0,007% at 8 Ω

At 40 Hz to 16 kHz

0,02% at 4 Ω

0,007% at 8 Ω

At 1 kHz

0,01% at 4 Ω

0,007% at 8 Ω

Total Harmonic Distortion Half Power

At 20 Hz to 20 kHz : 0,007% at 8 Ω

At 1 kHz 0,003% at 8 Ω

-26 dB power at 1 kHz :  0,05% at 4 Ω

50 mW power at 1 kHz :  0,08% at 4 Ω

Intermodulation Distortion Rated Power

At 250 Hz  : 8 kHz = 4 : 1, 4 Ω  :  0,02%

At 60 Hz : 7 kHz = 4 : 1 SMPTE, 8 Ω  :  0,007%

Poer Bandwidth both channels driven, - 3 dB

T.H.D. 0,03%, 5 Hz - 60 kHz (4 Ω )

T.H.D. 0,02% , 5 Hz - 60 kHz (8 Ω )

Residual Huma and Noise (Straight DC):  0,3 mV

Damping Factor :  30 (4 Ω ); 60 (8 Ω )

Headphones Output Level/Impedance:  560 mV/330 Ω

Load Impedance

Main or Remote :  4 Ω  - 16 Ω

Main and Remote :  8 Ω  - 16 Ω

Input Sensitivity/Impedance

Phono MM :  2,5 mV/ 47 k Ω

Phono MC :  170 µV/47 k Ω

Tuner, Aux :  150 mV/36 k Ω

Tape 1, Rec/Play :  170 mV/39 Ω

Tape 2 :  150 mV/36 k Ω

Phono max. Input Voltage at 1khz (rms, T.H.D. 0,01%)

Mm :  150 mV

MC :  10 mV

Signal-to-Noise Ratio (Rated Power 4 Ω )

Phono MM :  78 dB (86 dB, IHF A)

Phono MC :  68 dB (68 dB, IHF A, 250 µV input)

Tuner, Aux :  92 dB (106 dB, IHF A)

Signal-to-Noise Ratio (-26 dB Power 4 Ω )

Phono MM :  67 dB

Phono MC :  65 dB

Tuner, Aux :  68 dB

Signal-to-Noise Ratio (50 mW power 4 Ω )

Phono MM :  64 dB

Phono MC :  62 dB

Tuner, Aux :  65 dB

Frequency Response

Phono  :  RIAA standard curve ±0,5 dB (30 Hz - 15 kHz)

Tuner, Aux, Tape (Straight DC) : DC ~150 kHz (-3 dB) +0, -3 dB (20 Hz - 20 kHz)

Tone Controls

Bass :  50 Hz ±10 dB

Treble :  20 kHz ±10 dB

High-Cut Filter :  7 kHz -6 dB/oct

Subsonic Filter :  20 Hz -12 dB/oct

Loudness Control (volume at -30 dB):  50 Hz -9 dB

Output Voltage/Impedance

Rec Out :  150 mV

Rec/Play :  30 mV/82 k Ω

Channel Balance:

AUX, 250 Hz - 6300 Hz :  ±1,0 dB

Channel Separation:

AUX, 1 kHz :  55 dB

General

Power Requirements:  AC 110/120/220/240 V 50/60 Hz

Power Consumption:  760 W

Dimensions (W x H x D):  430 x 153 x 351 mm (16-15/16" x 6-⅓2" x 13-13/16")

Weight:  12,5 kg (27,6 lbs)

 

Technics ST-S7 tuner

A Quartz Synthesizer Tuner That ls a Worthy Source of High Fidelity

The ST-S7 tuner provides listening quality which will convince you that FM broadcasts can, in fact, be sources of superb sound. To achieve this high level performance, we have departed from conventional tuner design in several areas. Two of the most significant design elements are the incorporation of digital signal processing technology and the introduction of DC amplification and detection (which is impossible to achieve through conventional analog designs). Benefits of this design include improved stereo separation especially in the low-bass range, for a faithful reproduction of musical ambience. This is achieved along with a very high selectivity of 85 dB (±400 kHz) indicating no trade off of selectivity vs. Separation as is the case with conventional designs.

We've also taken full advantage of the quartz synthesizer's potential by providing an optional FM antenna tuning control with our remarkably effective SH-F101 compact room antenna. All this is contained in a sleek, slim tuner with a 43.6 mm (1-23/32") high front panel. In appearance as well as performance, the ST-S7 is an excellent match for the recently introduced Technics "New ClassA" amplifiers.

 

DC Amplification, DC Detection, and DC Stereo Decoding for Excellent Sound Quality

DC capability has recently been introduced to amplifiers. Even though tuners are intended to handle the same audio signals as amplifiers, little progress has been made, until now, in DC tuner technology.

The instability of the local oscillator frequency produces this situation. In a superheterodyne dial-type tuner, a drift in local oscillator frequency creates inaccuracy in the IF center frequency. This results in increased distortion, which is caused by DC voltage in the detector. In a conventional analog tuner, this "output without input" can be corrected, but not prevented. Analog tuners employ AFC (Automatic Frequency Control) to correct this problem, but AFC handles all the DC voltages in the detector stage as erroneous signals. This makes it impossible to provide amplification and detection down to DC.

Unlike the conventional analog tuners, a quartz synthesizer tuner's local oscillator frequency is stabilized by the extremely precise quartz oscillator frequency. Since there is no need for AFC, this makes DC amplification (including the RF stage, DC detection, and DC stereo demodulation) possible.

By taking advantage of the inherent potential of the quartz synthesizer approach, we have produced the world's first DC tuner. ln addition to such a significant innovation, we've also added other useful features which imorove performance, like a balance detector output tor connection to the MPX stage.

 

DC Peak Sample and Hold MPX Circuitry Excellent Stereo Separation

The ST-S7 exhibits very high FM selectivity of 85 dB (±400 kHz),a figure that is rarely matched with conventional designs. Normally, tuners with such high selectivity  have sacrificed in the areas of distortion and stereo separation. But in the ST-S7 the employment of DC peak-sampling holding circuitry has removed this design conflict. Wide stereo separation (55 dB at 1 kHz)  is achieved despite the high selectivity of 85 dB and distortion is only 0.15% stereo. The keys to success are DC capability in the detector and MPX stages and the digital sample/hold processing  of the 38 kHz stereo subcarrier, which replaces the conventional switching decoder method. Because of the high sampling rate, additional information is obtained from the stereo channels. Moreover, frequency separation is un affecled by the potential instability of the 19 kHz pilot signal until the point of complete detuning.

 

25 kHz Quartz Reference Frequency

The reference frequency of the ST-S7's quartz synthesizer tuner is 25 kHz; most other quartz tuners use a reference frequency of 5 kHz. This is but one measure of the ST-S7's superior performance. Although it may seem contradictory to find a reference frequency within an audio band, this arose because of the ready availability of an lC that was originally developed for car stereo tuners. When the 5 kHz reference frequency of this lC leak sin to the audio signal path, a low-level whistling sound is produced. Distortion may not be audible in the relatively noisy environment of an automobile; but it is undesirable, to say the least, in a high quality tuner like the ST-S7. Therefore, we developed our own lC specifically for quartz synthesizer tuners. This new lC produces a highly stable reference frequency of 25 kHz, safely above the audio frequency spectrum.

 

Back-to-Back High-Q Varactors and MOSFET Front End to Prevent lM Interference and Provide High Sensitivity

On a crowded FM band, it is particularly  important to eliminate lM interference (which is caused by interference of three nearby broadcast frequencies) in the tuner's RF stage.

In the ST-S7, our back-to-back varactors (equivalent to a four-ganged variable capacitor) control capacitance through an applied DC potential rather than the manually controlled variation in capacitance found in dial type analog tuners. These varactors exhibit a very high Q so that only the desired broadcast frequency is selected, and intermodulation products from nearby stations are effectively avoided. The 4-pole MOS FET RF amp provides superb sensitivity of 20 µV (78 Ω )/46 dB quieting.

 

IF Staqe Ceramic Filters Have Outstanding Group Delay

Characteristics to Provide High Selectivity and Low Distortion Selectivity is extremely important on a crowded FM dial. With conventional tuners, you have two choices: a wide lF band with low distortion or a narrow lF band with higher selectivity and higher distortion. Because of this, some tuner sare provided with switchable wide/narrow lF bands.

In this tuner, we have succeeded in achieving both low distortion and wide selectivity by using three very carefully manufactured and selected 4-element ceramic filters which have very flat group-delay characteristics. Without resorting to lF band switching, we've attained a very high selectivity of 85 dB (± 400 kHz), while distortion is a very low 0,1% (mono); 0,15% (stereo)

 

Extremely Easy and Accurate Tuning with Quartz Synthesizer Preset Buttons for a Total of 16 Stations, 8 AM and 8 FM, Plus Quartz Lock Indicator

Perhaps the greatest advantage of quartz synthesizer tuning is that virtually perfect tunig can be achieved easily and quickly. Moreover, this completely electronic tuning system readily lends itself to preset capability, thereby eliminating the need for signal strength or center tuning meters.

To "manually" tune the ST-S7, you just press the UP or DOWN button. This lets you electronically scan the dial as long as you keep either the UP or DOWN button pressed. When you reach the desired broadcast frequency, the locked indicator lights up, indicating that the station that you have selected is precisely tuned in.

 

Built-in Programmable Timer for On/Off Tuning of Three Programs

The Technics-developed micro processor. Utilized for our quartz-synthesizer tuning, is so powerful that it can also provide a programmable timer function. This allows you to program the tuner to tune in the stations  you want at the times you choose. The programmable timer can be set to turn two programs off and on every day, and an additional program for one particular time and day of the week. So the tuning of three programs can be left entirely to the tuner. The timer also controls the power to the tuner's switched AC outlet so that your amp or tape deck will turn on at the same time as the programs are tuned in.

This tuner is equipped with a 24-hour quartz clock which provides great accuracy (+ 10, -0 seconds per month). In fact, it can serve as a digital clock when the TUNER OFF button is pressed.

To program the timer, simply set the program selector to WRITE and Dress the preset buttons for the times you want. Of course, you can cancel in the middle of a program (CANCEL) or check your setting (READ). While listening to a program, you can check on the preset time by pressing the CLOCK CALL button. The time will be displayed for about five seconds; then the tuned-in station's frequency will reappear on the digital display.

 

Specifications

FM Tuner Section

Frequency Range:  87,5 - 108,0 MHz

Sensitivity

S/N 30 dB :  0.95 µV  (75 Ω )

S/N 26 dB :  0.85 µV  (75 Ω )

S/N 20 dB :  0.75 µV  (75 Ω )

IHF Usable Sensitivity :  0.95 µV  (IHF '58 )

IHF S/N 46 dB Stereo Quieting Sensitivity:  20 µV  (75 Ω )

Total Harmonic Distortion

MONO :  0,1%

STEREO :  0,15%

Signal-to-Noise Ratio

MONO:  69 dB (77 dB IHF)

STEREO:  65 dB (72 dB IHF)

Frequency Response:

5 Hz - 18,000 Hz (+ 0,2 dB . - 0,5 dB)

5 Hz - l8 kHz (± 1,5 dB)

Alternate Channel Selectivitv: 85 dB (±400 kHZ); 55 dB (±300 kHz)

Capture Ratio:  1,0 dB

lmage Rejection (at 98 MHz): 80 dB

lF Rejection (at 98 MHz): 110 dB

Spurious Response Rejection (at 98 MHz): 95 dB

AM Suppression: 55 dB

Stereo Separation:  55 dB (at 1 kHz); 40 dB (at 10 kHz)

Carrier Leak:

At 19 kHz :  -65 dB (-70 dB, IHF)

At 38 kHz :  -48 dB (-50 dB , IHF)

Channel Balance:  250 Hz - 6300 Hz ±1,0 dB

Limiting Point:  0,7 µV

Bandwidth

iF Amplifier:  180 kHz

FM Demodulator:  1000 kHz

Antenna Terminals:  75 Ω  (unbalanced) F-type coaxial

AM Tuner Section

Frequency Range: 

530 - 1620 kHz (10 kHz step)

522 - 1611 kHz (9 kHz step)

Sensitivity:  30 µV , 250 µV/m

Selectivity:  55 dB

Image Rejection at 1000 kHz:  45 dB

IF Rejection at 1000 kHz:  50 dB

Timer Section

Clock:  Quartz-lock type 24-hour indication

Precision:  Within 0 to =10 sec. Monthly (at 25°C)

Function:  24-hour programmable every day: 2 times; once only: 1 time

Programmable Contenet:  Program source (FM,AM), Power On/Off timing; Designation of preset stations

Setting Intervals:  1 minute - 23 hours, 59 minutes

Priority Order:  Once, everyday 2, everyday 1

Memory "back-up":  about 3 months (without AC power)

General Section

Power Requirements:  AC 110/120/220/240 V 50/60 Hz

Power Consumption:  9,9 W

Batteries:  DC 45 V (3 "AA" size)

Dimensions (W x H x D):  430 x 53 x 310 mm (16-15/16" x 2-3/32" x 12-7/32")

Weight:  4,0 kg (8,8 lbs)

 

Technics RS-858US 8-track deck

Technics 4-Channel 8-Track Cartridge Deck

RS-858US Features:

2/4-Channel Record/Playback Cartridge Deck

4-channel record

4 VU meters

Pana-Ject/Continuous play

2/4-channel selector and indicator

Program selector

Direct read-out program indicator

Minute/second program timer

Locking fast forward

4 microphone inputs

Front/rear headphone changeover

4 separate volume controls

AC outer rotor motor

Record indicators for each channel

 

Specifications

Recording System:  AC bias and AC erase

Motor:  Electronic Speed Control Motor

Track System:  8-track; 4-channel/2-channel stereo rac and play

Tape Speed:  3-3/4 rpm

Frequency Response:  30 - 12,000 Hz

Wow and Flutter: less than 0,20%

Signal-to-Noise Ratio:  better than 45 dB

Inputs Sensitivity/Impedance:

4 Mic :  0,15mV/200-600 Ω

4 Line :  45 mV/100 k Ω

Output Level/Impedance:

4 Line:  0,8 V/50 k Ω

2 Headphone ;  50 mV/8 Ω

Power Requirements:  AC 90-109; 110 - 125; 200-219; 220-250 Volts, 50/60 Hz

Power Consumption:  12W

Dimensions (W x H x D):  21-1/8" x 4-3/4" x 11-1/4"

Weight:  19 3/4 lbs

 

 

Technics SB-G500 loudspeakers

For more realistic sound reproduction today's stereo integrated amplifiers and stereo receivers are going for bigger and bigger power and must be complemented by speaker systems with high power handling capacity. The speaker system must also be designed to handle the problem that occurs when even relatively low power amps are used with their tone controls all the way up. Even if volume is less than maximum, a low power amp operated in this way can damage a speaker unit. To meet these needs Technics developed the SB-G500 with its tremendous 300 watt power handling capacity.

The SB-G500 uses six units symmetrically arranged on the fight and left for an even dispersion pattern in both directions and for excellent sound localization. Without the grille the effect is quite mechanical showing a nose of diffuser but with the grille on this speaker system takes on an elegant look that will match the decor of any room.

Gigantic 41 cm Woofer for Rich Bass

Rich bass is, of course, needed for contemporary as well as classical music. If you like disco sound, the bass from the gigantic 41 cm woofer will really impress you. If you prefer classical music, you'll be surprised at the rich lows from the bass instruments in the orchestra. The heat resistant high polymer film bobbin used in this woofer is one reason for the high power handling capacity. The bass reflex enclosure also contributes to outstanding bass.

Other High performance Speaker Units

Two 12 cm cone-type midrange units take care of the range from 1,500 Hz to 4,000 Hz. They also use a high polymer film bobbin with high heat resistance for excellent high power handling capacity.

10 cm Tweeter with Diffuser

The all-important range from 4,000 Hz to 10,000 Hz uses a tweeter with an aluminum bobbin for improved power handling capacity. A diffuser assures wide dispersion of sound to all parts of the room

Two Dome-Type Super Tweeters

Super high sound above 10,000 Hz is the work of two 14 mm dome-type super tweeters with thin metallized polyester film diaphragm that feature superior sound dispersion.

 

Thermal Relay Protection and Level Control

The system has a resettable thermal relay protection against overload. This protective device does not interfere with the sound under normal conditions but should there be heat build-up for some reason, it is easily and quickly reset by pushing a button. A red LED indicator lights up to indicate that the thermal relay protection has cut off the input to the tweeter. There is also a level control for the tweeter and super tweeters to tailor high frequencies to individual tastes and room conditions.

 

Specifications

Configuration:  4-way; 6-speaker bass-reflex

Speaker Units

1 x 410 mm (16-1/8") Cone type woofer

2 x 120 mm (4-3/4") Cone type midrange

1 x 100 mm (4") Dome type tweeter with diffuser

2 x 14 mm (5/8") Dome type Super tweeter

Impedance:  8 Ω

Input Power :  300 W

Output Level:  99 dB/1 W/1 m

Frequency Range:  20 Hz - 25,000 Hz

Crossover Frequencies:  1,500 Hz ; 4,000 Hz; 10,000 Hz

Dimensions (Hx W xD):  710 x 464 x 296 mm (28" x 18-1/4" x 11-5/8")

Weight:  21,2 kg (46,7 lb)

 

Technics SB-G800 loudspeakers

Super Bass Speaker System

4-way bass reflex speaker system, with

410 mm (16-1/8") Super Bass Woofer delivers double the bass power compared with conventional woofers of equivalent size.

160 mm (6-15/16") midrange driver operates in its own hermetically sealed cavity,preventing mutual interference between midrange and woofer.

65 mm (2-1/2") tweeter is equipped with diffuser (acoustic lens) to assure wide dispersion of treble sound.

Dome-type super tweeter (114 mm diameter) provides extra high range clarity, and is also equipped with acoustic equalizer and diffuser plate.

High range response can be fine-adjusted with tweeter level control. Tuned, vented design contributes to high sensitivity (98 dB/watts) sound pressure level at 1 meter.

Frequency Response:  35 Hz - 25 kHz

Power handling Capacity:  250 watts music

Resettable thermal relays with overload indicator, 8 Ω  impedance

Crossover Frequencies:  250 Hz; 2,5 kHz; 10 kHz

Dimensions (W x H x D):  464 x 720 x 310 mm (18-1/4" x 28-11/32" x 12-7/32")

Weight:  17 kg (36,3lb)

Walnut grain cabinet

 

Technics SA-626 receiver

Technics quartz-synthesized receivers

No tuning system on earth is more precise than quartz.

Tune in an FM station with a Technics SA-626 quartz-synthesized receiver and you can be absolutely sure that it will be perfectly in tune. And that station will stay in tune because the chance of encountering FM drift is 0,00% thanks to the crystalline accuracy of technics quartz-synthesized tuning.

Technics synthesized quartz also eliminates the hassle of tuning. Just push a button and you can preset and instantly retrieve seven AM and seven FM stations. And with Auto-scan, you can sample FM stations automatically.

The amplifier in the SA-626 will give you clean, crisp and dynamic sound because of Technics synchro-bias circuitry which completely eliminates switching distortion. By sending minute amounts of current to the amplifier transistors, synchro-bias never allows them to switch on or off. So there's absolutely no switching distortion.

Listen to the SA-626 and hear the sonic purity of synchro-bias circuitry and the crystaline tuning precision of Technics synthesized quartz.

 

Specifications

Amplifier Section

Rated Minimum Sine Wave RMS Power Output 20 Hz - 20 kHz,( both channels driven):

2 x 65 W at 8 Ω , 0,005% T.H.D.

Total Harmonic Distortion (rated power at 20 Hz - 20 kHz):  0,005% (8 Ω )

Frequency Response:  5 Hz - 100 kHz -3 dB

Signal-to-Noise Ratio (IHF - A)

Phono :  78 dB (87 dB , IHF '66)

Aux, Tape :  82 dB (100 dB , IHF '66)

Max. Input Voltage

Phono :  130 mV (150 mV, 1 khz0

Tone Controls

Bass :  ±10 dB at 50 Hz

Treble :  ±10 dB at 20 kHz

FM Tuner Section

Frequency Range:  87,9 - 107, MHz (200 kHz step); 87,5 - 108,0 (50 kHz step)

Sensitivity:  10,8 dBf (1,9 µV, IHF '58)

Total Harmonic Distortion (1 kHz)

Mono :  0,09%

Stereo :  0,15%

Signal-to-Noise Ratio

Mono :  75 dB

Stereo :  70 dB

Frequency Response:  20 Hz - 15 kHz +1 dB -2 dB

Stereo Separation (1 kHz):  45 dB

Alternate Channel Selectivity:  75 dB

AM Tuner Section

Frequency Range:  522 - 1611 kHz (9 kHz step); 530 -1620 kHz (10 kHz step)

Sensitivity:  30 µV , 300 µV/m

Selectivity:  55 dB

General

Power Requirements: Ac 50 Hz / 60 Hz 110 V, 120 V, 220 V, 240 V

Power Consumption:  626 W

Dimensions (W x H x D):  430 x 120 x 330 mm (16-15/16" x 4-23/32" x 14-31/32")

Weight:  11,1 kg (24,5 lb)

 

Technics SA-818 receiver

Technics new Class A receivers

Give you so much because they give you so little. 0,00% switching distortion. 0,00% FM drift

 

Technics SA-818, uncommon receiver, because he has it too, synchro-bias circuitry and quartz-synthesized tuning. Together they give you that special something you've come to expect from Technics : sonic excellence.

Synchro-bias. What it does may seem complicated, but it sounds simply beautiful. With conventional amplifier designs, the output transistors constantly switch omn and off as the input waveform goes from positive to negative. Technics synchro-bias eliminates switching distortion because it constantly sends minute amounts of current to the transistor not in use. And since the transistors don't switch on or off, distortion is eliminated.so is FM drift because both receivers include our quartz-synthesized tuning system. With its quartz-crystal oscillator both the frequencies broadcast and those received are quartz-synthesized so tuner drift is completely eliminated. So is the hassle of tuning because SA-818 can be preset to receive eight AM and eight FM stations.

You'll also like Technics acoustic control because its high and low range boost and filter switches can attenuate or boost two different frequency ranges.

Technics New Class A receivers. They give you more what you want and less of what you don't.

 

Specifications

Amplifier Section

Rated Minimum Sine Wave RMS Power Output 20 Hz - 20 kHz both Channels Driven :

110 W per channel at 8 Ω  : 0,005% T.H.D.

150 W per channel at 4 Ω  : 0,008% T.H.D.

1 kHz Continuous Power Output both Channels Driven (0,001% T.H.D.

120 W per channel at 8 Ω

170 W per channel at 4 Ω

Dynamic Headroom:

1,5 dB at 8 Ω

2,0 dB at 4 Ω

Total Harmonic Distortion

Rated Power at 20 Hz to 20 kHz

0,005% at 8 Ω

0,008% at 4 Ω

Half Power at 20 Hz - 20 kHz :  0,005 % at 8 Ω

Half Power at 1 kHz : 0,001% at 8 Ω

SMPTE Intermodulation Distortion:  0,01% at 8 Ω

Frequency Response

Phono :  RIAA standard curve ±0,3 dB

Aux, Tape : 20 Hz - 20 kHz +0 dB, -0,3 dB  (5 Hz - 100 kHz -3 dB)

Input Sensitivity

Phono :  0,28 mV (2,5 mV IHF '66)

Aux, Tape :  16 mV (150 mV IHF '66)

Signal-to-Noise Ratio (IHF A)

Phono :  74 dB (82 dB IHF '66)

Aux, Tape :  79 dB (100 dB IHF '66)

Maxi.  Input Voltage :

Phono :  180 mV (190 mV, 1 kHz)

Input Impedance

Phono :  47 k Ω

Aux, Tape :  33 k Ω

Tone Controls

Bass :  ±10 dB at 50 Hz

Treble :  ±10 dB at 20 kHz

Middle :  ±6 dB at 1 kHz

Acoustic Controls (at tone "0" position)

Low Boost :  100 Hz +6 dB

High Boost :  10 kHz +6 dB

Low Cut :  70 Hz, -6 dB/oct

High Cut :  7 kHz, -6 dB/oct

Loudness Control (Volume at -30 dB):  50 Hz +9db

Muting :  -20 dB

Output Voltage

Rec Out :  150 mV

Low Frequency Damping Factpor:  50 (8 Ω ); 25 (4 Ω )

Load Impedance

Main or Remote :  4 - 16 Ω

Main and remote :  8 - 16 Ω

FM Tuner Section

Frequency Range:  87,9 - 107,9 MHz

Sensitivity:  10,3 dBf (1,8 µV, IHF '58)

50 dB Quieting Sensitivity

Mono :  13,2 dBf (2,5 µV IHF '58)

Stereo :  36,2 dBf (35,4 µV IHF '58)

Total Harmonic Distortion (Normal)

100 Hz :  0,15% (mono); 0,25% (stereo)

1 kHz :  0,1% (mono); 0,15% (stereo)

6 kHz :  0,.25% (mono); 0,3% (stereo)

Signal-to-Noise Ratio

Mono :  76 dB

Stereo ;  72 dB

Frequency Response:  20 Hz - 15 kHz +0,2 dB -0,8 dB

Alternate Channel Selectivity: 

Normal ±400 kHz :  65 dB

Narrow ±400 kHz :  85 dB

Narrow ±300 kHz ;  75 dB

Capture Ratio (Normal) :  1,2 dB

Image Rejection at 98,1 MHz ;  80 dB

IF Rejection at 98,1 MHz :  90 dB

Spurious Response Rejection at 98,1 MHz :  100 dB

AM Suppression:  60 dB

Stereo Separation (Normal)

45 dB at 1 kHz

35 dB at 10 kHz

Carrier Leak

-65 dB at 19 kHz

-70 dB at 38 kHz

FM De-emphasis:  25 µs, 50 µs, 75 µs

Antenna Terminals:  300 Ω  (balanced), 75 Ω  (unbalanced)

AM Tuner Section

Frequency range:  530 - 1620 kHz

Sensitivity:  30 µV, 250 µV/m

Selectivity:  55 dB

Image Rejection at 1000 kHz ;  50 dB

IF Rejection at 1000 kHz :  45 dB

General

Power Requirements:  AC 120 V 60 Hz

Power Consumption:  590 W, 740 VA

Dimensions (W x H x D):  566 x 172 x 396 mm (22-9/32" x 6-25/32" x 15-19/32")

Weight:  18,5 kg (40,6 lb)