Mitsubishi LT-5V turntable

Vertical Format Linear Tracking Fully Automatic LSI Logic Turntable Unit

1 - Linear Tracking - A Major Advance in Turntable Performance

Many disc audition problems arise because conventional tone arms swing in an arc across the disc from a single pivot. This innovative unit features linear tracking with the stylus and tone arm traveling in a straight line across the disc, foiiowing precisely the same path as the head of the cutting machine that made the disc. The improvement in performance is clearly audible, and marks a moajor step forward in turntable unit design.

2 - The Linear Tracking Mechanism

To keep the cartridge stylus always precisely at right angles to the disc groove, two sensitive optical sensors detect the slightest deviation from the proper tracking position. The unbalanced signal from the two sensors actuates a servomotor that immediately moves the tone-arm base the correct distance in towards the center of the disc. Therefore, as the groove spirals inwards, the tonearm assembly moves across with it. This system is so sensitive that it can respond accurately to the differences in the pitch at which the groove was cut  (loud passages are cut at a larger pitch). The high precision servo-motor drives the tone-arm assembly via a specially wound stainless steel wire, wire tension is kept constant by spring loading and the servomotor rotation is applied by a worm type reduction gear. This system holds the tone-arm assembly firmly in position unlike linear motors where the assembly is free to slip and slide. The entire tone-arm assembly rides on a mirror finished high precision rod of nonmagnetic stainless steel, providing stability and rigidity.

3 - Low Tracking Error Means Superb Trackability

Conventional tone arms have tracking errors of several degrees. The LT-5V tracking error is never greater than ±0,1°, a dramatic improvement in the ability of the stylus to trace the groove accurately. The result is a reduction in distortion that shows itself in better definition of the stereo sound field and a more realistic recreation of the original atmosphere of the performance, with each instrument clearly located. All cartridges will benefit from this improvement the better the cartridge, the greater the advantage.

4 - A Short, Straight Arm with Fewer resonances

Conventional arms suffer two important disadvantages. In order to reduce tracking error, they have to be made as long as possible, and they have to set the cartridge off at an angle to the pipe (usually by putting an "S" or "J" bend in the pipe). Increased length means greater effective mass or, if a lighweight material is used in an effort to reduce mass, the tone arm has a stronger tendency to resonate. The short, straight arm of the LT-5V achieves greater strength and reduced resonances using a structure of stainless steel, giving a sound that preserves the full impact of transients and excellent definition right down into the deep bass region.

5 - Improved Stereo Channel Balance

Since the stylus is always at right angles to the groove, there are effectively no unbalanced forces on the stylus. Not only does this remove the need for inside-force cancellers. It also preserves channel balance and separation, ensuring much more faithful reproduction.

6 - Vertical Configuration Improves Feedback Margins

Vibration from speaker systems can sometimes cause acoustic feedback to the stylus tip and serious loss of high-level listening quality even when it doesn't result in a continuous "howl' that prevents normal listening. The vertical turntable configuration is much less sensitive to feedback than horizontal units because the vibration from the speaker systems is at right angles to the motion of the stylus in tracking the groove.

7 - Simple,Accurate Dial-Setting of Stylus Tracking Force

The tone arm hangs vertically down, statically balanced in all three dimensions for completely stable and accurate tracking of the groove. It is therefore able to follow even warped discs - and cope with vibrations - with much less tebdency to skip out of the groove.

The vertical format has another important advantage; since the weight of the cartridge itself acts at right angles to teh tracking forcee. It has no effect on it. So once the right tracking force has been set, there is no need to re-balance and reset it when swap ping cartridges. And the simple dial-setting adjustment of tracking force could hardly be easier to use.

8 - Record Clamp and Stabilizer

A spring loaded clamp secures the disc to the vertical turntable. Hinging completely out of the way for convenience, it snaps into position positively, and applies a slight pressure that brings the disc into contact with the dished turntable mat. It thus acts as a disc stabilizer, reducing vibration and improving the crispness of bass response. The upper edge of the clamp has a scale that corresponds with the scale above the tone-arm assembly. Use these two scales to locate any track you want to play,, and to guide the stylus precisely to the lead-in groove.

9 - Double Flywheel Drive System

In addition to the flywheel effect of the turntable itself there is a second counterweight flywheel. Together, they are accurately dynamically balanced for smooth and stable rotation, with high precision bearings.

10 - Fully Electronic Auto Control

The brain of the comprehensive automatic functions is an LSI computer on a chip specially developed by Mitsubishi Electric. It takes the signals from the push-button controls and from the photoelectric sensors that detect the presence and size of the disc on the turntable, and guides the stylus unerringly to the lead-in groove, automatically choosing 45 rpm for 7" and 33 rpm for 12" discs. It also enables a number of other useful and unusual automatic functions.

11 - Optical Display

LED indicators show the movement of the tone arm in real time, whether to left or right and up and down - they cease to indicate once the stylus is on the surface of the disc. The LED tracking error indicator gives a quick and positive indication of serious tracking errors. It is also useful in checking that the arm is hanging perfectly vertical.

Specifications

Drive:  Phase-locked loop belt drive by DC servomotor

Platter Diameter:  304 mm 912") diecast Al.

Olatter Weight:  1,3 kg (2lb 14 oz)

Moment of Inertia:  300 g/cm/s²

Speeds:  33 and 45 rpm adjust. ±3%

Speed Selection:  Auto/manual

Wow and Flutter:  0,045% WRMS

Signal-to-Noise ratio: 65 dB (IEC-B);  76 dB (DIN B)

Tonearm Type:  Straight universal, static balanced

Overall length:  223 mm (8-3/4")

Effective lebgth:  180 mm (7-1/8")

Tracking Error:  ±0,1°

Headshell:  GFRP (6,2 g)

Cartridge Weights:  10 - 20 g

Power Consumption:  14 W

Dimensions (W x H x D):  466 x 430 x 200 mm (18-3/8" x 17" x 7-7/8")

Weight:  12,5 kg (27 lb 8 oz)

Mitsubishi LT-20

 Linear Tracking - Significantly Improved performance

Like the top-of-the-line LT-30, the LT-20 uses the same Mitsubishi linear-tracking technology. Freed, by this important technical innovation from the tracking errors and unbalanced inside forces that affect conventional turntable units, there is a truly remarkable increases in the transparency and clarity of the audio image, and in the spatial definition of the stereo sound field. The stylus follows the same straight line across the disc as the cutting head that made the original master recording, so that tracability is at a maximum and distortion at an absoulte minimum.

The Linear-Tracking Mechanism

A high precision Dc servomotor drives a worm-reduction gear attached to a spring-loaded multistrand nylon coated stainless-steel wire to move the tonearm assembly. The whole system is located firmly in position, unlike linear motors where the assembly is free to slip and slide.

The precise amount of movement needed to maintain tangential tracking as the groove spirals inward is determined by two sensitive optical sensors. These detect when the tonearm moves even a fraction of a degree from the tangent position.

 Smooth, Stable Tracking System for High S/N Ratio

The signal-to-noise ratio of the LT-20 is an unusually high 75 dB (DIN-B) higher rhan many conventional turntable units, a tribute to the smooth, silent movement of the tonearm assembly on its precision runners.

Simple, Positive Adjustment

Adjustment of tracking force - often a problem on some competitive units - could hardly be simpler; a milled knob on the main tonearm assembly is used to zero balance the cartridge, and then the subweight is moved along the tonearm pipe to give the desired tracking force. The setting is easy to make, highly accurate, and readily visible.

Simple vertical adjustment of tonearm height is also provided, so that all cartridges can be accomodated with the tonearm perfectly parallel to the platter surface.

 High-Resolution Anti-Resonant Tonearm

The LT-20's linear-tracking tonearm is short and straight, unlike the long S- or J-shaped conventional arms. This , and the choice of stainles steel for the pipe - offering the ideal combination of rigidity and strength - gives a tonearm with an extremely low effective mass of only 13,9 grams,free of obtrusive resonances. The low mass makes an important contribution to the ease and accuracy of tracking, even with warped discs. A special filling of anti-resonant butyl rubber helps to reduce resonances still further, for the clean, clear-cut sound that distinguishes Mitsubishi linear -tracking turntable units.

The combination of a radial ball bearing and two wide span lateral pivot bearings ensures a stable, sensitive, low-friction assembly. Oxide-free copper wires are used to carry the low-current phono-cartridge signal to your phono inputs, ensuring minimum resistive losses and improved audio quality.

 Fully Automatic Control Using and LSI Computer on-a-Chip

Our first generation of electronic logic controlled turntable units used many individual Ics to give the new, user oriented features. The LT-20 uses a special purpose LSI device that gives flexibility, with increased reliability and a comprehensive range of automatic functions. As explained earlier in this catalog, it takes the signals from the operating controls and from the photoelectric sensors that detect the presence and size of the disc on the platter, and guides the stylus to the lead in groove. At the same time it chooses 45 rpm for 7" and 33 ⅓ rpm for 12" discs.

Other functions are:

Auto lead-in :  press the start control and the tonearm moves to the first track on the disc, gently lowering the stylus to commence play.

Auto return :  at the end of the disc, the tonearm lifts and returns to its rest position.

Auto cut :  play can be ended at any point during disc audition.

Free access lead-in :  the stylus can be traversed to the left to start audition from the track of your choice. Speed of traverse automatically slows over the disc surface.

Auto repeat :  the same disc can be repeated as many times as you wish.

Lift-up and cueing :  the stylus can be alternately raised an lowered at the touch of a control.

Free travel :  the stylus may be raised and traversed freely to the left or right, from track to track at either of two speeds - fast for rapid approach and slow for fine positioning - by either pressing the controls continuously.

Quick response :  any movement except lift/cue of the stylus can be interrupted by a new command.

Stylus protection :  when there is no disc on the platter, the stylus will not descend and the tonearm will return to rest protecting the stylus and cartridge from serious damage.

 Platter Speed Under Quartz Crystal Oscillator Control.

The word 'Quartz" in the illuminated window at the center of the LT-20's control panel is your guarantee that platter speed is either 33 ⅓ or 45 rpm - precisely. It illuminates as soon as the direct-drive motor speeds the platter  up to rated revs. A built-in frequency generator produces a frequency that is compared with a standard reference frequency generated by a quartz crystal oscillator.

A rapid response feedback circuit locks these two frequencies together so that the platter always rotates synchronously. The combination of the ultimate in accuracy with the simple, reliable and effective direct-drive mechanism ensures low wow and flutter both now and throughout a long useful life.

Other Important Features and Functions

Ideal headshell design.

Overhang former.

Lighty smoked polystyrene dust cover.

Anti-howling design.

Convenient Operating Controls

Speed selector switch;

Start control;

Stop control;

Lift/Cue control;

Repeat control.

Specifications

Type:  Direct-Drive logic-controlled fully automatic linear-tracking

Drive System:  Quartz PLL DC servomotor direct drive

Platter Diameter:  304 mm , diecast aluminum

Platter Weight:  1,3 kg (2 lb 14 oz)

Speeds:  33 ⅓ and 45 rpm

Wow and Flutter:  0,025% WRMS

Signal-to-Noise Ration:  75 dB (DIN-B); 60  dB (IEC-B)

Tonearm Type:  Straight type universal static balance

Lenght Overall / Effective:  220 mm (8-11/16") / 171 mm (6-3/4")

Effective Mass Tonearm:  13,9 g without cartridge

Overhang:  0 mm

Offset Angle:  0°

Tracking Angle Error:  maximum 0,1°

Headshell weight:  GFRP type, 6,2 g

Cartridge Weight Range:  10 - 21,5 g with headshell

Output Capacitance:  55 pF

Power Requirements:  110 or 240 V , 50/60 Hz

Power Consumption:  14 W

Dimensions (W x H x D):  424 x 141 x 417 mm (16-3/4" x 5-1/2" x 16-3/8")

Weight:  10 kg (22 lbs)

Technics SV-P100

 For home and studio digital recording appilcations Technics presents the SV-P100 , a wholly self-contained unit with built-in VHS tape mechanism. The Technics SV-P100  is the most compact digital recording system in existence. lt has everything you need to start making the highest quality recordings you've  ever heard. Advanced semiconductor circuitry provides  outstanding performance in a compact package. Plus you enjoy versatile digital  editing features. W ith all this state-of-the-art technology, you'll  be happy  to find that the SV-P100 is just as easy to use as an ordinary cassette deck-perhaps easier.

 High-Density LSls for Compact Size

State-of-the-art semic onductor technology is the  key to the compact dimensions of the SV-P100, the world's smallest digital recording system. Three original  LSI c hips handle virtually  all  of the signal  processing including digital-to-analog and analog-to-digital conversion. They also take care of error detection,  error correction, video signal modulation and time-base correction. Since these take the place of thousands of transistors and hundreds of  lCs, circuit size is dramatically reduced.

Built-in VHS Mechanism

Built into the SV-P100 is a very high quality VHS video tape transport mechanism with advanced video heads and quartz locked direct drive motors. Basic operation is just like on a conventional cassette deck, with the comfort of microcomputer feather-touch control keys. You simply put a cassette into the front loading compartment and press the rec and play buttons together to begin recording. The cassette door is motor driven for smooth, silent operation when you want to load or eject a cassette.

Multi-FunctioN Display

There's adigital LCD tape counter display, bright FL recording/playback level display, and indication for all functions that you might need. The FL  level display uses fluorescent display tubes to provide very accurate indication of recording level. Besides instantaneous peak indication, it also has  peak-hold which shows  you the highest signal peaks reached in each 2 -second period. T his makes it much easier to set optimum recording level. Another valuable feature is the playback data check indication which gives you a readout of playback signal quality

 Versatile Editing

Since the digital signal is recorded on the tape's video tracks, the space usually used for audio is left free. The SV-P100 uses these extra tracks for "jump" and" search" marks.  This gives you a kind of electronic editing ability that is not possible in ordinary cassette decks. Record a jump mark along a specific section of the tape and the deck will automatically bypass that section at 8 times normal speed.  Normal playback resumes after the end of the  jump mark. This is useful when you want to skip over undesired portions of a recording. Search marks let you rapidly locate specific points on the tape. The tape will advanced to the nearest search mark at 8 times normal speed and then stop. lf you press the play key with the search key, then playback will begin when the search mark is reached.

You can record as many search and jump marks as you want, using the convenient editing levers. Since these marks remain on the tape, you can take advantage of this convenience every time you listen to a recording. Of course you can also selectively erase search and jump marks (by pressing the "clear" lever) as required.

In addition to all this,you have the "locate" function which serves as a memory linked to the tape counter. But unlike on conventional cassette decks,  you don't have to set the counter to zero. This memory stores the actual tape counter number at the instant you press the locate button. The tape will then stop (or begin play)att he memorized position. You can also check the locate memory position by pressing the recall button.

 Other Features

Large fader knob for smooth fade-in and fade-out effects.

Digital input and  output terminals for making digital tape copies usinga nother SV-P100.

Angled control panel with status indicator LEDs.

Headphone and microphone jacks on front panel.

High quality microphone amp built-in for superior live recording quality.

Recessed power switch helps avoid accidental on/off switching.

Automatic recording possible with audio timer.

Dew (condensation) display and protection circuitry

Tracking adjustment for optimum playback of tapes recorded on other equipment.

Specifications

Type:  Digital audio cassette recorder

PCM Standard:  By technical File -- STC-007

Quantization:  Linear 14-bit

Decoding:  Linear 14-bit

Tape: VHS type video cassette

Signal Format:  Standard NTSC television; signal by VHS standard

Recording Time:  About 2-hour max.  (Using NV-E180)

Channels:  2 (L, R)

Frequency Response:  2 Hz  - 20 kHz (±0,5 dB)

Harmonic Distortion:  less than 0,01% (1 kHz, 0 dB)

Dynamic Range:  More than 86 dB

Input Sensitivity/Impedance: 

Line :  30 mV (-15 dB) / 50 kΩ

Microphone :  0,7 mV (-15 dB) / 600 Ω

Digital :  1 Vp-p / 75 Ω (Video format)

Output Level/Impedance

Line :  400 mV (-15 dB) / 600 Ω

Digital :  1 Vp-p / 75 Ω (Video Format)

Remote Control Terminal:  8 pin DIN terminal

Edit Function: 

Jump, Search,

Memory, Memory recall, Playback data  check,

Tracking adjustment,

Timer recording & 1-hour delay recording;

Digital recording terminals,

Headphone and microphone jacks

General

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

Power Consumption:  90 W

Dimensions (W x H x D):  430 x 278 x 346 mm

Weight:  21 kg

Technics SU-8080

 Features

Tone, Volume  and Balance Controls;

Speaker Selector;

Recording Mode Switch;

Tape-Monitor Selector;

Input Selector;

Main Amp Operationand Input Switch;

Phono Capacitance and Resistance Input Selector;

Mode Mono/Stereo Selector;

EQ Subsonic Filter Switch;

High-Filter and Loudness Switch;

Muting Switch;

Headphone Jack.

A fact which is often lost sight of in these days of proliferating audio products is that the first and foremost purpose of an amplifier is to amplify. To amplify the program source as accurately as possible, neither adding to nor subtracting from the natural beauty of your music. Technics terms this Waveform Fidelity, and it's what we continuously strive to achieve in all our fine components. ln the SU-8080, our audio engineers have gone all out in their ouest for absolute Waveform Fidelity. Major features include our newly-designed Integrated DC Amplifier, totally separate power supplies for each channel, a fantastically quiet equalizer circuit, direct high level input to the DC power amplifier, and dozens of other innovations. Read the following specifications and then listen to this amplifier perform. We're confident that you'll want to hear a whole lot more from the SU-8080.

New Integrated DC Amplifier for Maximum W aveform Fidelity

The power amplifier of the SU-8080 is a newly-designed DC amplifier to ensure the maximum in Waveform Fidelity. lt features a first stage differential amplifier, a purely resistive loaded voltage amplifier, an emitter follower and a two-stage Darlington-connected fully complementary output stage.

For complete low frequency reproduction all the way down to  0 Hz, all coupling capacitors have been totally eliminated from the SU-8080 circuits. No capacitors will be found anywhere in the signal path: in the output stage, between stages, or in the NFB loop. Since capacitors cannot pass DC or any frequencies close to it, their use-and they are used in nearly all other amplifiers-places a distinct limit on lower range frequency response.  Another advantage of the DC circuitry is the orrection of another problem found in conventional amplifiers: phase dislocation of bass frequencies.  Overall, then, the DC amplifier simply performs better and permits much more accurate reproduction of the input signal and therefore better Waveform Fidelity.  And that, we repeat, is the name of the game.

To obtain the best from a DC amplifier, one should avoid using it with a non-DC preamplifier.  That's why the SU-8080 is designed so that high level inputs from Tape, Tuner, Aux etc., can be routed directly to the power amplifier without passing through any other circuits. That's what we mean by an "integrated" DC amplifier. When operated in this fashion, the DC power amplifier has a gain oI 42 dB (above 0.02 Hz). And compared to a conventional amplifier, the SU-8080 delivers aconsiderably lower level of distortion as measured between the high level input terminals and the speaker terminals. When necessary, tone controls and/or filters can be switched in from the front panel, in which case the power amplifier gain is 28 dB. The amplifier produces 72 watts per channel, minimum RMS, into 8 ohm  from 20Hz to 20,000 Hz with a phenomenally low THD of less than 0.02% at full rated power. When power drops down to 36 watts, the maximum level at which it would normally be used in most home applications, THD is an incredibly small 0.0015% (1kHz).

ln the first stage differential amplifier, the SU-8080 employs current mirror loading and Technics' unique dual packaged transistors which are well matched for thermal stability. Current mirror circuit construction means that only the initial stage has any bearing on the amp's DC balance. In order to always keep the DC base potential strictly at zero, a DC bias has been provided for proper operation. Whenever there is a danger of pure DC leaking into the DC amplifier -  an undesirable situation from the standpoint of speaker protection - you  need only switch in the Low Cut Filter. This effectively cuts off  all signals below 2 Hz and sliminates any possibility of problems. In addition, should more than ± 2.5V of direct current appear at the output terminals of the power ampliifer, the speakers are electronically disconnected from the amplifier to prevent speaker damage.

 Super Silent Phono Equalizer: 88dB S/N Ratio

To accompany this superb power amplirfer.Technics audio  engineers were not content to include a conventionapl phono equalizer in the SU-8080, and a major effort was launched to find ways to achieve the same kind of superior performance in the equalizer that the DC amplifier  affords.  Efforts centered on the elimination of noise from the equalizer circuits, the kind of noise that you can hear in a conventionl amplifier by placing the input selector  switch to Phono and turning up the volume. lt was found that  to reduce noise (i . e . Increase the S/N ratio) both circuit noise and transistor internal noise would have to be tackled. Conventional  low noise transistors were found to be lacking, and still produced noise after circuit noise had been reduced.

Thus, a transistor newly developed by Technics was employed. This was the M47L, which is beyond compare in its low noise characteristics. lt is used in the first stage differential amplifier operated with a current mirror load to produce an extremely low noise operating current. The result is an un precedentedly high phono S/N ratio in the SU-8080 of 88dB at a sensitivity of 2.5mV (lHF-A). You will notice the difference with a regular high impedance cartridge, but the difference  is really impressive  when using a low impedance  MM cartridge at high volumes. Other important steps in achieving superb phono equalizer performance include the use of Metalized polyester film capacitors as the coupling capacitors for the input and output stages (to ensure that no distortion is present even in the inaudible range), and the use of precision components throuqhout the equalizer circuity.  Metalized film resistors with a tolerance of only  ±1%, and polypropylene capacitors with a tolerance of ±2%  are used exclusively. This permits the achievement of extremely accurate frequency response throughout the entire audio range.Variation from the standard RIAA curve is no more than ±0.2 dB.

The following graph shows the relationship between input voltage and total harmonic distortion of the SU-8080 phono equalizer amplifier.  Total harmonic distortion remains extremely low even in the low frequency range where the effect of NFB is small. High input levels  up to 280mV can be handled without causing distortion or other quality degradations, so  that even high output cartridges tracking discs of high cutting levels will be accommodated without the slighest problem.

Equalizer Subsonic Filter

A sharp subsonic filter built into the equalizer circuit permits the operator to cut off  all sounds below 30Hz (12dBloct) at the flick of a switch. This eliminates low frequency vibrations picked up by the cartridge from warped records, etc., and prevents these sounds from muddying the low frequency range of  your music. 

Switchable Input Resistance/Capacitance Settings

The impedance of the phono input has a subtle but important effect on the quality of sound produced. ln the SU-8080, the input resistance is switchable between 27kΩ and 47kΩ, while the capacitance may be switched between high and low. This gives a total of four  possible combinations, thus allowing the SU-8080 to accommodate the whole range of cartridges available on the market today. (For low output  MC cartridges a separate pre-preamp or step-up transformer  will be needed.)

Additional  Features of  the SU-8080

Completely Independent Power Supplies for Each Channel.

The test of a quality amplifier is how it responds to music transients, those sharp, loud, sudden sounds that occur so frequently in many kinds of music. A poor amplifier cannoth andle these transients and distorts the music in a very noticeable manner. The cause is insufficient power supply capacity for both channels, and often the transients occurring on one channel will end up distorting the music on the other channel  because too much current is drawn away from the one channel to be used in the other. This is known as transient crosstalk. The most elegant way to eliminate this problem is to utilize separate, independent power supplies for each channel. This is exactly  what  Technisc enqineers have built into the SU-8080. lt utilizes two hefty power transformers and four oversized 10,000 µF electrolytic capacitors along with two separatere rectifier circuits for total separation  of  the two supplies. T his completely, solves the problem of transient crosstalk. In addition, the power supply for the voltage amplifie r stage in both the power amp and the preamp are of the constant voltage type which means that both transient distortion in each channel and self-transiend  distortion are greatly suppressed, producing an amplifie r with excellent  dynamic characteristic. The two transformers are arranged on the chassis in such a way that they largely cancel out each other's leakage flux, thus contributing to the excellent S/N ratio.

New Type Tone Controls

When the selector switch on the front panel of the power amp is switched to the "via tone" position, the tone controls are placed in operation and adjustments to the sound may be made. But the tone controls of the SU-8080 have a unique difference, for when they are in their c enter positions, the tone control circuit components (resistors and capacitors) are removed from the circuit and the frequency response is totally flat.

Dynamic Range Unaffected by Muting Circuit

Audio muting is accomplished by altering the power  amplifier's NFB by 14dB. This differs from the conventional method which is to introduce resistance after  the volume control. The virtue of this new approach is that the dynamic range is not altered, although the noise is decreased in volume. lt also means that the audio muting takes place after the tone ampliifer when the selector  switch is in the via tone position.

Precise, Error-Free Volume  Control

The volume control is a precision-crafted continuously variable device to permit accurate adjustment of playing volume level. The circuit utilizes 1% tolerance metal film resistors in the NFB loop of each channel's ampliifer and maintains gain difference  within 0,5 dB, so that the left-right  balance between the channels does not vary when the volume is adjusted up or down.

Versatile Controls

The SU-8080 has facilities to accommodate two tape decks, and dubbing in either direction is possible. The rec mode and tape monitor switches are independent, so you may play records or listen to the FM tuner while dubbing tape-to-tape. This convenient feature permits great flexibility and allows maximum enjoyment of your equipment.

High Filter

An effective high filter engaged from the front panel eliminates irritating high frequency noises such as record scratches and tape hiss.

Specifications

Power Amplifier Section (IHF)

Continuous Power both Channel Driven [1 kHz];

92 W + 92 W at 4 Ω

74 W + 74 W at 8 Ω

Continuous Power both Channel Driven [20 Hz - 20 kHz];

90 W + 90 W at 4 Ω

72 W + 72 W at 8 Ω

Total Harmonic Distortion:

Rated Power at 1 kHz (8 Ω / 4 Ω) :  0,02% / 0,02%

Rated Power at 20 Hz to 20 kHz (8 Ω / 4 Ω) :  0,02% / 0,05%

Half Power at 1 kHz (8 Ω / 4 Ω) :  0,0015% / 0,0015%

Power Bandwidth( both channel driven at 8 Ω):  5 Hz - 40 kHz  -3 dB

Frequency Response:  20 Hz - 20 kHz  +0 -0,1 dB ;  0 Hz - 100 kHz  +0 -3 dB

Signal-to-Noise Ratio (IHF, A):  115 dB

Residual Hum & Noise:  100 µV

Damping Factor:  70 (8 Ω);  35 (4 Ω)

Input Sensitivity/Impedance:  1 V/50 k Ω

Load Impedance:

Main or Remote :  4 -16 Ω

Main + remote :  8 - 16 Ω

Preamplifier Section

Input Sensitivity/Impedance:

Phono 1 and 2 :  2,5 mV/47 k, 27 k Ω

Tuner, Aux :  200 mV/35 k Ω

Deck Pb, Rec :  200 mV/35 k Ω

Phono Maximum Input Voltage:  280 mV

Total Harmonic Distortion:  0,1%

Signal-to-Noise ratio (IHF, A):

Phono 1 and 2 :  88 dB

Tuner, Aux :  100 dB (via tone);  106 dB (direct)

Frequency Response:

Phono 1 and 2 :  RIAA standard curve ±0,2 dB

Tuner, Aux :  20 Hz - 20 kHz  +0-0,1 dB

Tone Controls:

Bass :  50 Hz, -7,5 dB - +7,5 dB

Treble :  20 kHz, -7,5 dB - +7,5 dB

Equalizer Subsonic Filter:  30 Hz  -12 dB/oct

High Filter :  10 kHz  -6 dB/oct

Loudness Control (volume at -30 dB):  100 Hz  +8 dB

Muting:  -14 dB

Output Voltage:

Pre Out :  1 V (rated);  9 V (max.)

Rec Out : 200 mV

Rec/Play :  30 mV

Amplifier Section

1 kHz Continuous Power  (both channel driven):

2 x 92 W at 4 Ω

2 x 74 W at 8 Ω

40 Hz - 16 kHz Continuous Power (both channel driven):

2 x 90 W at 4 Ω

2 x 72 W at 8 Ω

Total Harmonic Distortion:

Rated Power at 1 kHz, (8 Ω / 4 Ω) :  0,02% / 0,02%

Rated Power at 40 Hz - 16 kHz (8 Ω / 4 Ω) :  0,02% / 0,05%

-28 dB rated Power at 1 kHz (4 Ω) :  0,08%

50 mW Power at 1 kHz (4 Ω) :  0,15%

Frequency Response:  20 Hz - 20 kHz  +0 -0,1 dB

Signal-to-Noise Rated Power:

Phono 1 and 2 :  70 dB

Tuner, Aux :  92 dB

-26 dB Rated Power:

Phono 1 and 2 :  65 dB

Tuner, Aux :  67 dB

50 mW Power:

Phono 1 and 2 :  60 dB

Tuner, Aux :  62 dB

Channel Balance : ±1,0 dB

Headphones Level/Output Impedance:  550 mV/330 Ω

General

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

Power Consumption: 490 W

Dimensions (W x H x D):  450 x 140 x 371 mm (17-23/32" x 5-1/2" x 14-19/32")

Weight:  14 kg (30,9 lbs)

Hitachi SR-802

 "Our SR 802 tuner amplifier will set you back over £200.

You could pay more, and you could pay a lt less .

But cheap alternatives have a nasty habit of giving up when  he going gets hot."

We guarantee this won't happen with a SR 802. It's got a built-in protection circuit tolook after your power transistors and speakers.

At the first sign of trouble it'll turn itself off.

And there's warning light on the front panel to keep you in the picture.

The tuner on the SR802 has some useful refinements too. Like the FM 'muting' circuit which eliminates all inter-station noise is being selected.  And there's one more feature on the SR 802 you won't find on every turner amp.

It's called reliability. And it's standard on all Hitachi equipment.

So is the Hitachi 2-year guarantee.

Specifications

Tuner Sections

FM Stereo Frequency Range:  88 -108 MHz

Usable Sensitivity (IHF):  1,7 µV

Harmonic Distortion Factor:

Mono : 0,15% (400 Hz)

Stereo : 0,25% (400 Hz)

Signal-to-Noise Ratio:  74 dB

Selectivity (IHF):  80 dB

Image Rejection Ratio:  85 dB

IF Rejection Ratio:  100 dB

Capture Ratio: 1 dB

AM Suppression Ratio:  55 dB

FM Stereo Separation:  45 dB (1kHz)

AM Frequency Range:  530 - 1605 kHz

Usable Sensitivity:  300 µV/m (S/N 20 dB, 20 µV (IHF)

Image Rejection Ratio:  50 dB

IF rejection Ratio:  50 dB

Signal-to-Noise Ratio:  50 dB

Selectivity (IHF):  35 dB

Audio Section

Music Power (IHF):

80 W/ch + 80 W/ch (8 Ω, 1 kHz, 0,5% THD)

70 W/ch + 70 W/ch (4 Ω, 1 kHz, 0,5% THD)

RMS Power Output (both channel driven):  50 watts per channel, min. RMS, at 8 Ω from 20 - 20,000 Hz, with no mor than 0,5% THD

60 W/ch + 60 W/ch (8 Ω, 1 kHz, 0,5% THD)

70 W/ch + 70 W/ch (4 Ω, 1 kHz, 0,5% THD)

Frequency Characteristics:  10 Hz - 30 kHz (±1 dB)

Harmonic Distortion: 

At rated output : 0,5%

At ½ rated output : 0,05%

Power bandwidth:  10 - 40,000 Hz

Tone Control:

Bass : ±10 dB at 100 Hz

Treble : ±10 dB at 10 kHz

Power Source:  100V/120V/220V/240V  50/60 Hz

Dimensions (W x H x D): 

Weight:  

PIONEER CT-F 7171

CT-F7171 SPECIFICATIONS:

Modes: Compact cassette, 2-channel stereo/mono

Recording System: AC bias system (bias frequency: 85KHz) Erasing System: AC push-pull system Heads: "Ferrite Solid" recording/playback, head x 1, Ferrite erasing head x 1

Motor: Electronically-controlled DC motor

Wow and Flutter: Less than 0.10% (WRMS)

Fast Winding Time: Approximately 80 seconds (C-60 tape)

Frequency Response: Standard tape; 30 to 13,000 Hz, (40 to 12,000 Hz ±3dB): Chromium dioxide tape; 30 to 16,000 Hz (40 to 13,000 Hz ±3dB)

Signal-to-Noise Ratio: Dolby off; 48dB (standard tape), Dolby on; 58dB (over 5KHz, standard tape) *With use of chromium dioxide tapes, signal-to-noise ratio is further improved by 4.5dB over 5KHz

Harmonic Distortion: Less than 2% (at 333Hz, 0dB)

Inputs (sensitivity to maximum level/impedance): MIC (6mm jack); 0.2mV to 90mV/20 Kohms *Low-impedance (600 ohms) microphones can be used. LINE (pin jack ) ; 60mV to 9V/470 Kohms: REC/PB ( DIN jack); 6mV to 2.7V/ 10 Kohms

Outputs (level/impedance, at meter 0dB): LINE (pin jack); 300mV/50 Kohms: REC/PB (DlN jack); 300mV/50 Kohms, HEADPHONE (6mm jack); 40mV/ 8 ohms

Semiconductors: Amplifier section: Transistors; 37, Diodes; 23, lCs; 2, Zener Diodes; 5, Light Emitting Diodes; 2, FETs;2, Motor control section: Transistors; 2, Diode; 1

Power Requirements: U.S.A. and Canada model; 120V 60Hz only or 110, 120, 130, 220, 240V (switchable 50-60Hz) *No need for pulley changing between 50Hz and 60Hz areas

Power Consumption: 15 watts (max.)

Dimensions: 430(W) x 138(H) x 310(D) mm, 16-15/16(W) x 5-7/16(H) x 12-7/32(D) inches

Weight: 8.5 Kg /18lb. 12oz.

The new Pioneer CT-F7171 is proof positive of a new level of sophistication in stereo cassette deck design and performance. First, it is a front-access deck, with the tape compartment located on the front panel. This unusual design - blends perfectly with other Pioneer components and enables uniform in-rack mounting without wasting space or sacrificing convenience. The ingenious, jam-proof tape compartment positions a loaded cassette at a 30⁰ -degree angle to facilitate access; a switched compartment illuminator allows instant confirmation of tape condition and travel direction. lts front-access design also means that all switches, meters and controls are sensibly situated in logical, user-oriented relation to the tape compartment on the front panel.
And the versatility of the Pioneer CT-F7171 is equally advanced. There is a built-in Dolby noise reduction system, Bias/EQ switches for normal or special-type tapes, a switched Recording Limiter, LED recording and Peak Level indicators, Memory Rewind, a Skip Button for high-speed tape search, rotary level controls, and much more. As for performance, the Pioneer CT-F7771 exhibits minimum wow/flutter (less than 0.10% WRMS), thanks to its electronically-controlled DC motor and precision capstan(roundness error 0.1 fi, while its ferrite-solid head adds to your assurance of high signal-to-noiseratio, wide frequency range and minimum distortion. Advanced electronics and daring design-the frontaccess CT-F7171 stereo cassette deck with Dolby is altogether a new direction in hi-fi tape equipment, from Pioneer.

FRONT-ACCESS DESIGN
All necessary deck operations including tape loading and unloading, are performed on the front panel. This daring design-a new direction in cassette deck thinking-enables you to mount the CT-F7171 in a component rack or on shelves along with your receiver, tuner, amplifier or other components.
There's no need to waste space by providing vertical (top) access to the tape compartment or controls. The ingenious, jam-proof tape compartment itself is slanted at an angle of 30* to facilitate confirmation of tape condition, aided by a switched compartment iIluminator.

RECORDING PEAK LEVEL INDICATOR
Pioneer has developed a unique, simple-to-use Peak Level Indicator which detects the peak level of an incoming signal within a few milliseconds. The LED (Light-Emitting Diode) indicator will never flicker or burn out. lt reacts more quickly and with more sensitivity than any level or VU meter to the exact level of transient peak signal reaching the recording head. lt lights t o warn you when the peak level of input is +4dB from reference level, particularly handy when making Dolbyized re-cordings with low-distortion and wide dynamic range.

BUILT-IN DOLBY NOISE REDUCTION
Noise-free recording and playback performance are assured by the Type B Dolby circuitry in the CT-F7171 By boosting certain portions of the highfrequency spectrum during recording, and deemphasizing them during playback, "tape hiss" is almost completely eliminated while those highfrequency sounds you should hear are allowed to come through clean and clear. A separate Dolby indicator and a simple push-button Dolby switch provide all the control you need.

ELECTRONICALLY-CONTROLLED DC MOTOR
Stability of tape travel and reliability of transport mechanisms are the most decisive factors in high fidelity cassette deck performance. Pioneer therefore has applied the finest tape transport techniques available in the CT-F7171, a double-sure combination of a highprecision capstan shaft (roundness error 0.1µ) and a dependable DC drive motor electronically controlled with a kind of servo-mechanism using solidstate devices to maintain precise drive voltage and stable rotation unaffected by power supply fluctuations. As a result, the wow/flutter characteristics of the CT-F7171 have been reduced to a ratio of less than 0.10% (WRMS)

SEPARATE BIAS AND EQ TAPE SELECTION
The CT-F7171 performs perfectly with any cassette tape you wish to usestandard, low-noise/high-output or the types which are coated with special chrome and/or ferrite compounds. There are two front-panel switches, each with two positions (normal/chrome); the BIAS switch provides optimum bias current for low-distortion, while the EQ switch controls the "70 µs" playback equalizer in the CT-F7171 (for use with chrome dioxide tapes) to provide an improvement in the signal-to-noise ratio by approximately 4.5dB (over 5 KHz) when measured against the normal "120 µs" type.

RECORDING LEVEL LIMITER CIRCUIT
Anothers imple-to-use front-panel switch handles the built-in recording level limiter circuit in the CT-F7171. Distortion caused by over-level signals during recording is avoided by first setting the input level to optimum (using the large level meters and the Peak Level Indicator), then switching on the automatic limiter. This is the same kind of circuit used in studio-type equipment, not the ALC (automatic level control) design found in portable type recorders, and is therefore suitable for high fidelity use.

HIGH-PERFORMANCE FRRITE-SOLID HEAD
Extended recording and playback life, greatly improved fidelity and other advantages are assured by the ferrite-solid REC/PLAY head used in the CT-F7171. The surface of this extra-hard, precision-gap unit is mirror-finished so that a smooth, constant head-to-tape contact is maintained, even with stiff chromium dioxide tapes. The head material and design repel dust and have very small magnetic loss in the critical high-frequency region.

MEMORY REWIND AND SKIP BUTTON
The CT-F7171 is equipped with two additional convenience features. One is the Memory Rewind function: with the front-panel Memory switch "ON", set the three-digit tape counter to "000" at the point on the tape from which you want to record (or play). When the tape has been recorded (or played) as far as you want it to go, flick the rewind switch and the tape will return to the "999" position - in other words, to the place where you started. The handy Skip Button also is easy to use: with the deck in the playback mode, a touch of the Skip Button will allow you to hear (monitor) the recorded sound at twice-normal speed, helping you to quickly locate any portion of the tape you desire.

WIDE-DYNAMIC-RANGE RECORDING AMPLIFIER
To assure that your recordings are able to reproduce the widest possible range of audio signals, Pioneer has included a recording amplifier of wide dynamic range. Maximum allowable MIC input is 9V with sensitivity of 0.2mV. Maximum allowable LINE input is also 9V against a sensitivity of 60mV.
OTHER VERSATILE FEATURES
(1)Standard-size professional microphone jacks (not the miniature pin-jack types) and stereo headphone jack on front panel.
(2) Recording Peak Level Indicators. (LED)
(3) Large, reliable level meters.
(4) Rotary, friction-coupled input and output level controls for left and right channels with reference index markers.
(5) Two pairs of input/output terminals, DIN standard jack and unswitched AC outlet (300W max.).
(6) Distinctive front-access design, natural deluxe wood cabinet and metallic front. All dimensions matched for installation with other Pioneer high-fidelity components( amplifiers and tuners).

Additional Features:
1. Tape selector (NORM-CHROM) with independently-switchable bias and equalizer
2. Built-in Dolby system (ON-OFF) with indicator lamp
3. Full-auto stop mechanism
4. "SKlP" button that enables quick monitoring at twice-normal speed.
5. Recording LED peak indicators
6. Recording limiter( ON-OFF) Operates at +4dB level from reference level
7. Memory rewind switch (ON-OFF)
8. Cassette bed illumination light and switch
9. Two pairs of input and output terminals
10. Independent recording and playback level controls with memory markers
11. Wooden cabinet