ONKYO Integra A-810 (1979) | W Super Servo

 

In 1979 a new model has been added to the Onkyo Integra series of integrated amplifiers. The A-810 was the top-of-the-line model. Of course, it features the Super Servo system, but this one has been further developed. This is the W Super Servo system. This is a kind of sound quality purification filter that cuts out harmful components in the ultra-low range. The sense of presence and atmosphere that had previously been masked by unnecessary signals now comes back to life right before your eyes. This unit uses a dual amplifier configuration (Dual Direct Amp) to maximize the effect of the W Super Servo system. This is a simple configuration that combines a variable gain equalizer for both MC and MM with a high-gain power amplifier, with a direct tone control consisting of only passive elements inserted between them. In other words, all factors that cause deterioration in sound quality are eliminated. In addition, Onkyo's unique method has been used to deal with switching distortion and crossover distortion. A linear switching method is adopted in the output stage of the power amplifier to measure the low-frequency crossover distortion, and high fT transistors have been used to effectively deal with switching distortion, almost completely eliminating this harmful effect. 

Technical specifications:

Rated output (20 to 20,000 Hz): 110W+110W (AUX→SP OUT 8Ω both channels driven)

Total harmonic distortion (20 to 20,000 Hz): 0.008% (AUX→SP OUT at rated output) 

Power Band Width: 5Hz - 100kHz (IHF-3dB THD 0.2%)

Damping Factor: 100 (1kHz 8Ω)

Frequency Response: 20Hz to 20kHz/±0.2dB (PHONO → REC OUT/RIAA deviation) 

2Hz to 100kHz +0dB, -1.5dB (AUX → SP OUT)

Dimensions/weight: 435W x 170H x 424Dmm/20.3kg

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AKAI GX-9 (1985) | For "Aggressive Recording"

 

The GX-9 model is a cassette deck released by Akai in 1984. The GX-9 takes advantage of the three heads, setting the optimal head gap width for each, 4μ for the recording head and 1μ for the playback head, achieving even better sound quality characteristics. The tape running system uses a closed-loop double capstan system that sandwiches the tape between two sets of capstans and pinch rollers, achieving stable running and uniform head touch . The diameter of the capstan shaft was slightly changed, 2.3 mm on the take-up side and 2.5 mm on the supply side, suppressing the occurrence of modulation noise caused by overlapping rotation periods. The drive system had a three-motor configuration, with dedicated motors for the capstan, reel, and mechanism drive. The capstan drive was equipped with Akai's unique brushless, coreless, slotless FG servo DD motor, which boasts high rotation accuracy and high torque. The flywheel was a sufficiently thick one for increased moment of inertia while the reel drive was equipped with a high-torque DC motor. All amplifier stages were fully DC, the playback head and playback equalizer amplifier were directly coupled, the amplifier block and Dolby block were completely separated, and audio-only parts were introduced. The playback equalizer amplifier used a newly developed current inverted push-pull amplifier. This amplifier has a push-pull configuration in which the FET differential amplifier output is current-inverted and passed through a current mirror stage, and a SEPP buffer is provided at the output. This allows for a wide bandwidth, low distortion, high slew rate, and wide dynamic range. The recording amplifier system uses a push-pull constant current output circuit in the symmetrical drive stage, which allows for linear recording head drive over a wide bandwidth. The recording amplifier itself is a completely non-feedback amplifier. A major feature of the GX-9 is the "double tuning bias system." This is Akai's unique tuning system that combines two-stage bias adjustment and quick autotuning to create a sound that suits the recording source and your preferences . It is an improvement on the quick autotuning + AT (auto) tuning bias system that was installed in the GX-R99 . Quick autotuning is an autotuning function that adjusts the equalizer and recording sensitivity to flatten the frequency response, and its amazing speed, which allows tuning to be completed in just 2 seconds. The upper half of the center of the front panel was equipped with a display section with FL indication, which displayed various information. The level meter with FL bar meter was equipped with a two-mode, two-color display with a SPECTRUM display in addition to the PEAK display. The SPECTRUM display was unique to Akai, and it divided the mid

-low and high-frequency components of the input source and, together with the MOL display that displayed the mid-low MOL (MML) and high-frequency MOL (SOL) according to the type of tape used above and below the bar meter, it was a function that served as a guide for bias setting. The tape counter was a 4-digit electronic counter, and in addition to the usual 4-digit counter display, it was also possible to display the elapsed time of play in minutes and seconds (ELAPSED) and the remaining tape capacity (REMAIN). The remaining tape capacity display was equipped with an automatic tape size detection mechanism that automatically detected the tape size (C-90, C-60, C-46), and it was able to calculate and display the remaining tape capacity with high accuracy even when the tape was being played. For noise reduction, Dolby was installed, and in addition to type B, type C was also installed. As mentioned above, the GX-9 was a high-performance deck with solid technology, quantity, and multiple functions packed into a slim case. It was a unit that clearly expressed the Akai style, which has a traditionally excellent technology for tape decks. It was a model that was sandwiched between the higher-end and lower-end models and was a somewhat modest presence, but it was a powerful machine with clear sound that properly reproduced the band. 

Technical specification:

Wow and Flutter: 0.025%WRMS (JIS) ±0.04%WPeak (EIAJ)

Frequency Response: 20-19,000Hz ±3dB Normal tape 

                    20-20,000Hz ±3dB CrO2 tape 

                    20-21,000Hz ±3dB Metal tape

Distortion  (1kHz 0VU) 0.5% Metal Tape

Signal to noise ratio: 57dB (EIAJ) 

Head: Super GX recording head x 1 

      Super GX playback head x 1 (combination head) 

      erase head x 1

Motor: FG servo DD motor (capstan) x 1 

       DC motor (reel) x 1 

       DC motor (function assist) x 1

Maximum external dimensions: 440W x 105H x 372Dmm

Weight: Approximately 7.0 kg

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SANYO VZ-S6000B(N) (1991) | BS S-VHS Hi-Fi

 

The Sanyo VZ-S6000B(N) is a Super VHS Hi-Fi video recorder with built-in BS (Broadcast Satellite) tuner. The previously used mid-mount chassis system has been further strengthened so that it offers improved balance and vibration resistance of the body which will ensure stable tape running. At the same time, the new separate construction design, which places the power block, which is a noise source, and the electronics circuit separately, reduces noise interference with other circuits. Furthermore, a floating structure that supports the tape running mechanism with vibration absorbing material reduces the transmission of vibration to the mechanism and achieves quieter operation. Meanwhile, the top cover is made of vibration-damping steel plate, and the high-density bottom chassis is a two-layer honeycomb structure, resulting in a high vibration-damping body. The VZ-S6000 is also equipped with a high-performance BS (Broadcast Satellite) tuner for high-quality picture and sound from satellite broadcasting. It ensures wide dynamic range reception and high interference wave rejection capability, realizing stable and high-quality satellite broadcasting reception. Furthermore, by adopting a negative feedback type wideband amplifier circuit, the output frequency characteristics are flattened up to 4.5MHz, reproducing high-fidelity images. In addition, the BS audio circuit section adopts a 4DAC-configured interpolative D/A converter that combines the advantages of multi-bit and 1-bit systems. For the video section it has been adopted an amorphous coating head drum with excellent wear resistance and friction characteristics thus running friction has been reduced and a stable tape running has been achieved. In addition, two brass impedance rollers are installed in the tape running section. A 3D digital comb filter has been used that achieves precise image reproduction. By storing image frame information digitally and carrying out detection processing, Sanyo has achieved more accurate Y/C separation. This is an advanced digital filter that suppresses dot interference and cross color that could not be covered by conventional comb filters. In addition, the image quality of TV broadcast, satellite broadcast, and laser disc signals can be improved by passing them through this 3D digital comb filter. Color contours are clearer and stripes can be reproduced clearly. The heads for both standard and triple speed modes are made of single crystal Sendust alloy. Other features include: BS monitor function that allows you to watch satellite broadcasts while recording general broadcasts. | Digital audio output terminal that transmits the high-quality digital audio of satellite broadcasts in pure form. | A thorough high-quality design with MOS twin drive power supply, independent audio L/R regulators, independent audio board, and audio electrolytic capacitors. | AI digital tracking that performs optimal tracking adjustment by distinguishing between self-recorded and other-recorded tapes. | Front input/output terminals for editing on the front of the unit. | Instant jog shuttle with REC edit function that can be operated while recording paused. | Super Still with improved shaking and pre-playback during still image playback. | Panel lighting for operation in dark rooms. Original sale price in Japan: ￥340,000

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Technics SA-R40 (1981) | Aircheck Amp

 

Advertised as an "Aircheck Amp" that integrates an FM/AM tuner, cassette deck and pre-main amplifier. This features a cassette recorder with electronically controlled DC motor. Fluctuations in tape tension during recording and playback are controlled to a minimum by controlling the reel motor current with an electronic circuit. The recording / reproducing head uses an all-Sendust head with high saturation magnetic flux density and low high-frequency loss. In addition to the Sendust head with excellent abrasion resistance, a Sendust mask is used on the tape contact surface other than the core to prevent uneven wear. The head shape is a hyperbolic shape with excellent contact with the tape to prevent disturbance of frequency characteristics. The erasing head uses a 3-gap ferrite head with high erasing efficiency to cope with the high coercive force of metal tapes. It is equipped with an automatic music selection mechanism (TPS) that can search up to 9 songs. It is also equipped with an FL display that displays peak values in two colors while the peak value is clearly displayed with an attack time of 120 μ sec. and a recovery time of 270 msec. Equipped with Dolby NR circuit and recording / playback timer standby. The tuner section is equipped with a quartz synthesizer. The front-end uses a high-Q varicap and junction FET to improve the IM interference rejection capability, and the IF stage uses a ceramic filter with excellent group delay characteristics to obtain sharp selectivity characteristics. The reference frequency for locking the local oscillation frequency of the quartz synthesizer tuner is set to 25 kHz outside the audio band to prevent leakage into the audio band and improve sound quality. In addition, the synthesizer section employs a unique swallow in counter method and a special frequency division method that uses a prescaler controller to control 1/16 and 1/17 minute periods prevent spurious interference from occurring in the broadcast band. Presets for 7 FM/AM stations are available. In addition, an auto-scan tuning function is installed. If you turn on the auto-scan button and press one push of the up/down key, you can tune to the nearest station. If you turn off auto-scan, manual tuning is also available. Equipped with 5 LED signal strength indicator to indicate electric field strength. The amplifier section uses a new class A amplifier (40W/ch) that combines the quality of class A operation with the high efficiency of class B operation. In this method, a constant bias current is supplied in synchronization with the rest cycle to the output  transistor which normally goes into complete rest alternately in order to obtain high efficiency in class B and class AB by a synchronous bias circuit, and switching distortion caused by the rest is eliminated by keeping the output stage active at all times. In addition, since the signal path and bias current path are independent, the output stage always keeps an appropriate operating point. Together with the function of the high-speed response diode, crossover distortion is eliminated and the sound quality of class A operation is obtained. In addition, a new study of the NFB theory was added, and a linear feedback circuit unique to  Technics with infinite gain in the NF loop is mounted, and the strain characteristic in the range of audibility is greatly improved. It uses a unique concentrated power block that reduces degradation of high-frequency characteristics due to electromagnetic radiation. The phono equalizer is an ICL circuit without the influence of the input capacitor. It consists of an IC with a differential amplifier circuit using a low-noise FET, an input stage using a current mirror load, and an output stage using a SEPP circuit. By using the separately sold remote control box (RP-9645), the set can be operated by a remote control. External dimensions: Width 430x Height 119x Depth 394 mm | Weight 12.0kg

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YAMAHA A-8 (1981)

The A-8 integrated amplifier from Yamaha features a linear transfer circuit supported by X-power supply and a preamplifier section using a pure current servo amplifier. The basic circuit configuration is simple : DC equalizer amplifier with new pure current servo amplifier system → high-gain DC main amplifier with linear transfer circuit. The main amplifier circuit is a two stage differential amplifier with a dual FET differential input as the first stage. All the circuits are cascade connected, so that low distortion rate characteristics are obtained up to large amplitude and high frequency. In the power stage, the linear transfer circuit developed for the separate power amplifier B-5 is adopted. The bias voltage is fixed, and each operating point of the power transistors connected in parallel is shifted so that the composite characteristic approaches the square characteristic and the linear total transfer characteristic is achieved. Smooth current waveform and low distortion factor characteristics with little crossover distortion are obtained from minute output to large output. An X-power supply is used for the power supply section, which uses an AC control element, TRIAC, and a reference voltage comparator. It controls the conduction phase angle of the voltage waveform applied to the primary side of the power transformer, and supplies power at high speed with the precision required according to the dynamic range of music. As a result, the output stage of the main amplifier section can be set to a constant voltage, which was impossible with conventional power supplies. At the same time, the low temperature of the amplifier with good regulation can be obtained. For the frame structure of the amplifier, an assembly method similar to the power transistor mounting structure is adopted, and insulation points and conduction points are clarified to realize a loop-less structure. The chassis surface is plated with copper plated with copper and the surface layer is a conductive layer that does not show magnetic properties, thereby reducing the sound quality degradation caused by iron. In addition, high-purity copper foil with a thickness of 35 μ m is used for the electric shield material that does not require strength, and the bottom cover is made of plastic to prevent eddy current loss. The Chemi-Con in the  power supply section, which has a significant effect on sound quality, uses a capacitor in a plastic case, an improved version of the one used in the A-9. The Chemi-Con in other signal paths also uses a plastic case. In addition, tantalum nitride  resistors are used for NFB circuits and other circuits with high element sensitivity. These resistors have excellent voltage distortion factor, resistance value stability, and low power supply noise. There are also used quality parts that have been developed and carefully selected, such as polypropylene capacitors, Mylar capacitors, and mica capacitors.

Technical data:

Power rating (20 Hz to 20 kHz, 0.003%) 150W + 150W (8 Ω)

Power Bandwidth (75W, 0.002%) 10 Hz ~ 100 kHz (8 Ω)

Damping factor 200 (8 Ω, 1 kHz)

Rated power consumption 240W

External dimension Width 435x Height 144x Depth 422 mm

Weight 12.5kg

DENON DR-M35HX (1985)

 

Main specifications: Track system/4-track 2-channel stereo | Tape selector/auto tape selector (NORMAL, Chrome, METAL) | Head: Playback: SF combination head x 1, erase: double gap ferrite head x 1 | Motor/FG servo DD motor (for capstan) x 1, DC motor (for reel) x 1, small DC motor (for mechanism control) x 1 | Wow and flutter/ ±0.07% W.Peak (EIA)), 0.035% W.RMS (JIS) | Fast forward time/approx. 30 seconds (C-60) | Overall frequency characteristics (input/20VU)/METAL tape 20Hz-22kHz (25Hz-20kHz ±30B) | Overall signal-to-noise ratio/METAL750B (3% THD) | Dimensions: W434 x H115 x D285 mm | Weight: 6.8 kg | Additional cable remote RC-57

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ADC Accutrac 4000 (1976)

 

Its father was a turntable. Its mother was a computer. That's how the advert introduced the Accutrac 4000. Are you ready to hear the selection on a record in any order you like, as often as you like, and skip the ones you don't like. Even by remote control. It's a marriage of solid-state integrated circuitry, infra-red electro-optics and the latest in direct-drive engineering. The result: The Accutrac 4000, the most accurate, reliable, noiseless turntable ever invented. And it even lets you re-arrange selections on a record to hear them in the order you want. The Accutrac 4000 reaches new lows. Wow and flutter are down to a completely inaudible 0.03% W.R.M.S. Rumble, -70dB (DIN B). Tracking force, a mere 3/4 gram. And tonearm resonance, the ideal 8-10 Hz. A direct-drive motor brings the massive die-cast platter to full speed instantly. And keeps it there with the help of electronic sensors which adjust for power fluctuation. So now, instead of just listening to a record, you can re-arrange the playing order of the selections, repeat them, even skip the ones you don't like. Just by pushing a button. Suppose you want to hear selections 5, 3 and 7. Simply press the buttons marked 5, 3 and 7. In fact, you can pre-set the sequence with any combination of up to 24 commands. And if you don't want to leave your chair to give the orders, beam it in by cordless remote control with the transmitter and receiver. Because the tonearm is electronically driven, not manual, you never risk dropping it accidentally and scratching a record, or damaging the stylus. The reason for this miracle is the minute infra-red scanning beam in the head that reads the surface of the record and directs the tonearm to follow your instructions.

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SHARP SC-8000 (1979) | Computer Controlled

 

The computer that revolutionized tape decks is now about to revolutionize stereo systems. With Sharp's SC-8000. The world's most complete music center. With computer control of the most dazzling collection of features and functions of any other system on the market. Sharp's SC-8000 is a computerized receiver/cassette deck that you can actually program to suit your musical preferences. Take control of your music with Sharp's exclusive computer. The mastermind of the system is Sharp's famous computer, built right into the deck. It controls Sharp's exclusive Auto Program Locate Device. With it you can program the SC-8000 to skip ahead or back to any song you prefer (up to 19 songs) and play or replay them automatically. You can even set any point on the cassette as the "beginning." Specs and features that will impress your ears-and your friends. Electronic Tape and Second Counting tell you how much tape or time you have left. And a built-in digital quartz clock displays timed-programming operations and acts as a timing device. Allowing you to program the SC-8000 for automatic record-ing from any source at any pre-selected time and then switch itself off. Sharp's SC-8000 also insures that you won't miss any of the highs, lows or anything in between. The deck touts a low 0.06% wow and flutter, frequency response of 40-14,000Hz (±3dB) for ferrichrome tape and 62dB signal-to-noise ratio (Dolby on). Sharp completes the ultimate music center. The SC-8000 is available as a total music system with the addition of a highly reliable belt-driven automatic turntable with a low mass "S" shaped tonearm and two Sharp Tri-Bass Accelerator speakers. So you can bring all this wonderful music vibrantly to life. 

Victor TD-V707 (1991) | Discrete 3-Head

 

The TD-V707 is equipped with 3 independent (discrete) heads, and by enabling the azimuth adjustment of the head independently for recording and playback, the stability of the stereo reproduction is clearer and superior in high frequency characteristics. In addition, a separator is installed between the recording head and the reproducing head to eliminate not only the magnetic cross field generated between the heads but also the electrical cross field generated by the head wiring. The head material is amorphous, which has excellent high-frequency characteristics, and fine amorphous. An ARKBASE is installed in the lower part of the chassis to eliminate the influence on the sound caused by vibration when the mechanism operates and resonance generated by external sound. This ARKBASE is a high-density compression molded board. A Closed-loop dual capstan system is adopted for the mechanism part. Capstan and pinch rollers are arranged on both sides of the independent head, and by keeping the tension from the beginning to the end of winding the tape constant, a stable head touch is always obtained. By combining this method with DD motor, sound loss such as stability of head touch, uneven rotation, noise reduction during rotation, etc. is suppressed. In addition, zinc die-cast is used for the mechanical base to increase the durability of the mechanism itself and greatly improve the verticality, parallelism, and vibration resistance of the capstan and pinch roller shaft. In addition, total modulation noise is reduced by using the vibration control capstan base and die-cast head base. As for tape running accuracy, a 3-phase 6-coil Ceralock servo direct drive motor realizes low wow flutter. Wireless remote control is included. The international market version was the JVC TD-V1050TN Titanium color model.

Technical Data:

3-Head Amorphous Discrete heads

3-motor with Direct Drive capstan motor

Wow & Flutter: 0.022% WRMS

Frequency Range (-20dB) 10hz to 23kHz

Dimensions: 435x143x335mm

Weight: 7.6kg

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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.

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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

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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

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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

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