McIntosh MAC 4280 receiver

  

The MAC 4280, a high quality FM/AM receiver, has many useful features to enhance your listening and video enjoyment. The Mcintosh Remote Control provides unusual varsatility with operating simplicity. It provides remote control in the main listening area and can be expanded to provide control from an additional area. In each area:  You can turn the AC power On or off;  You can select the listening sound source;  You can adjust the volume;  When the tuner section is the sound source, you can select the stations you wish to hear on either FM or AM, or select from the preset stations on either FM or AM;  When a Mcintosh CD player is the sound source, you can put the cD player in the play mode, shift to the next track or the preceeding track on the disc or stop play from the disc;  You can mute the sound.

Your listening commands are executed by pressing buttons on the hand-held remote controller. When you press a button the controller transmits, via an infrared beam, a command signal. The receiver for these signals is an infrared sensor in the MAC 4280 or a Mcintosh R607 remote Sensor.

A rear panel connector provides the input for rmote control from a second area. With the addition of a Mcintosh R607 Remote Sensor, all of the command capabilities of the main area can be executed in the second area.

Some of the features of the MAC 4280 are:

This "state-of-the-art." FM/AM tuner displays the station frequencies digitally. Stations are selected easily by the preset pushbuttons tuned with the manual tuning knob, or you can scan upp or down either broadcast band. When the stations assigned frequency is displayed, tuning is locked and held to the precise center of the broadcast channel. When the pushbutton presets have been programmed, the electronic memory will store and retain your 5 favorite stations on FM and Am, for instantaneous recall.

The tuning memory is retained for a week even though the receiver should become disconnected from the AC power line.

 

Separate listen,, and record facilities, introduced and perfected by Mcintosh, permit tape recording one program while listening to a second program. Separate input selectors, electrically isolated from each other, provide non interference operation in both listen and record. You can record on 2 tape recorders from any source and you can easily copy from one tape recorder to another.

Three separate tone shaping controls provide tone shaping. Each control adjust selected frequency bands to satisfy your personal preference or the demands of the program material.. At the detent in the center of the rotation of each control the equalizer circuits are disconnected, completely removed from the operating circuits.

Technological leadership is shown in the full power mcintosh amplifier which will deliver its maximum power output to one or two pairs of loudspeakers. The quality of the sound reproduction and the quality of your speakers are protected by the patented Mcintosh Power Guard circuit. The Power Guard waveform comparison circuit detects waveform differences between the input and the output signal. A sampling of the program material at the output of the amplifier is constantly compared with the program material at the amplifier input. Should the differences reach 0,5% , Power Guard goes to work. In only a fraction of a millisecond Power Guard dynamically reduces input level to prevent amplifier overload yet permits the amplifier to deliver its absolute maximum power output without extra distortion. The operation of the Power Guard circuit is absolutely silent. There is not even "soft" clipping. There is simply no clipping.

The patented Sentry Monitoring circuit constantly monitors the output signal. At signal levels up to rated output this circuit has no effect. If the power output exceeds design maximum, or in the event of a short circuit ir severe mismatch, the Sentry Monitoring circuit protects the output transitors from failure.

All in all, your selection of the Mcintosh MAC 4280 FM/AM Receiver will be reinforced by your day-to-day use of this superb instrument.

 

Specifications

Amp Section

Stereo Power Output (minimum sine wave continuous average power output per channel, from 20 to 20,000 Hz, with both channel operating): 

100 watts across 4 Ω loads,

75 watt accros 8 Ω loads

Power Bandwidth:  20 Hz to 20,000 Hz

Total Harmonic Distortion:  0,03% maximum at any power level from 250 mV to raated power per channel, 20 to 20,000 Hz, both channels operating

Intermodulation Distortion:  0,03% maximum if instantaneous peak power output is 200 watts or less across 4 Ω, or 150 watts or less across 8 Ω with both channels operating for any combination of frequencies, 20 Hz to 20 kHz

Frequency Response:  20 Hz - 20,000 Hz +0 -0,5 dB at rated power

Input Sensitivity

Phono MC :  0,12 mV produces rated output

Phono MM :  2,5 mV produces rated output

Tape, Aux ;  250 mV produces rated output

Power Amp :  1,5 V produces rated output

Signal-to-Noise Ratio (A-weighted)

Power Amp :  100 dB below rated output

Tape, Aux :  95 dB below rated output

Phono :  90 dB with 10 mV input

Maximum Input Signal

Phono MC :  4,1 mV

Phono MM :  80 mV

High Level :  8 V

Input Impedance

Phono MC :  100 Ω

Phono MM :  47 k Ω

Tape, Aux ;  20 k Ω

Power Amp :  18 k Ω

Damping Factor:  greater than 50 at 8 Ω

Tape Output

Phono :  250 mV with rated input

Tape :  250 mV with rated input

Tuner :  1,0 V at 100% modulation

Program Equalizer:  ±12 dB at 30, 750 and 10,000 Hz

FM Section

Uasble Sensitivity:  11,25 dBf which is 1,0 µV across 75 Ω

50 dB Quieting Sensitivity:

Mono :  15,2 dBf which is 1,6 µV across 75 Ω

Stereo :  27 dBf which is 6 µV across 75 Ω

Signal-to-Noise Ratio

Mono :  80 dB

Stereo :  75 dB

Frequency Response:

Mono :  ±0,5 dB from 20 to 15,000 Hz

Stereo :  ±0,5 dB from 20 t0 15,000 Hz

Total Harmonic Distortion Mono:

0,15% at 100 Hz

0,1% at 1 kHz

0,1% at 10 kHz

Total Harmonic Distortion Stereo

0,1% at 100 Hz

0,1% at 1 kHz

0,25% at 10 kHz

Intermodulation Distortion

Mono :  0,1%

Stereo :  0,2%

Capture Ratio:  1,5 dB

Alternate Channel Selectivity:  60 dB

Spurious Response:  95 dB

Image Response:  90 sb

AM Suppression:  60 dB

Stereo Separation:

35 dB at 100 Hz

45 dB at 1 kHz

40 dB at 10 kHz

SCA Rejection:  65 dB

AM Section

Sensitivity:  25 µV (external antenna)

Signal-to-Noise Ratio

50 dB at 30% modulation

60 dB at 100% modulation

Harmonic Distortion:  1,0% maximum at 50% modulation (0,2% typical)

Frequency Response:  30 Hz to 3,5 kHz +0 -6 dB

Adjacent Channel Selectivity:  50 dB minimum IHF

Image Rejection:  50 dB minimum

IF Rejection:  55 dB minimum

General Information

Semiconductors:  118 Silicon Diodes;  13 Varactor Diodes;  32 LED;  2  I.R. Emitting Diodes;  1 I.R. Photo Diode:  4 Seven Segment LED Displays;  3 Opto Couplers:  68 Bipolar Transitors:  3 Field Effect Transistors;  59 Integrated Circits

Remote Controller:  HR 4280 - 22 button infrared hand held controller

Power Requirements:  120 V, 50/60 Hz

Power Consumption:  60 to 575 watts

Dimensions (W x H x D):  464 x 133 x 394 mm   (18-1/4" x 5-1/4" x 15-1/2")

Weight:  13,1 kg (29 pounds)

Finish: 

Front panel is brushed black anodized aluminium with gold anodize trim

Side panels are machined solid walnut with satin lacquer finish

Dynaco Dynatuner FM-3

The Dynatuner is the culmination of more than threee years intensive research on a new concept of FM tuner design. Both the tuner and the stereomatic multiplex integrator represent a totally new design so inherently non-critical, so completely stable, so accurately reproducible, and so easily aligned that the average kit builder will have no difficulty in meeting its specifications in full, without the use of any test instruments whatsoever. The Dynatuner will be most recognized for its low distortion, but it has achieved the most successful blend of sensitivity, stability and linearity yet realized.

The Dynatuner is a kit in every sense; no sections are pre-built or pre-aligned - but Dyna's proven engineering has made it the easiest of all FM tuner kits to build,, and simpler than most competitive amplifiers. The use of heavy duty XXXP and fiberglas pre-punched circuit boards assures exact placement of all components - an essential factor in critical tuner circuits. The excellent specifications of the Dynatuner are possible, and guaranteeable, unit to unit, lab model to production kit, because of the extraordinary uniformity which etched circuits provide, and the inherent stability of the Dynatuner circuit configuration.

 

The design of the Dynatuner evidences several engineering innovations. A cathode coupled RF stage, rather than a cascode input, has been refined to provide equivalent sensitivity without the disadvantages of cross-modulation (images) generally associated with the cascode design. Outstanding AM supression has been achieved,, with noticeable improvement in difficult urban reception areas, and reduced interference from multipath dispersion. Four stages of IF amplification, furnishing four stages of progressive limiting, plus careful attention to limiter design, result in superior suppression of impulse noise such as auto interference, and yield more usable low level signals than other tuners of equivalent sensitivity. We have expended some gain (sensitivity) to achieve better low level limiting, where it counts the most. The Dynatuner limits on noise alone - contributing to its low interstation noise level.

 

The Dynatuner's combination of performance 9high sensitivity, lack of drift, low noise, high selectivity, and lowest distortion) reliability (top-grade etched circuit construction, highest quality parts, conservative operation of components, ease of alignment) and simplicity of construction and operation, plus unsurpassed flexibility (with the FMA-2 and the FMX-3) make it an outstanding example of the Dynakit reputation for obsolescence-proof design.

 

Specifications

Based on IHF standard T-100

Useable Sensitivity:  4 mV for total noise and distortion 30 dB below 100% modulation

Signal-to-Noise Ratio:  70 dB at 100% modulation

Total Harmonic Distortion:  less than 0,25% at 100 % modulation

IM Distortion:  less than 0,5% from 10 mV - 100,000 mV at 100% modulation

Drift:  less than 0,03%

Frequency Response:  10 Hz - 15 kHz ±0,5 dB

Audio Output:  2 volts at 100% modulation

Output Impedance:  less than 5000 ohms

Discriminator peak to peak Separation:  greater than 900 kHz

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

Dial calibration Accuracy:  0,2%

Useable Sensitivity Stereo:  3 dB less than mono mode

IM or T.H.D. :  less than 1% ( including 19 kHz and 38 kHz residual)

Stereo Separation :  30 dB

Capture ratio:  5 dB

Selectivity:  54 dB

Audio Hum:  73 dB below 1 V output

AM Suppression:  greater than 63 dB

Power Consumption:  55 watts

Dynaco PAT-4 pre-amplifier

 

The PAT-4 is a solid state countrpart of the renowed PAS-3X Dynaco stereo preamplifier, providing the same superior performance with a number of added features. The PAT-4 can be used with any tube or transistorized Dynaco power amplifier or virtually any other power amplifier, tube or transistor. Available either as an easy-to-build kit for the hobbyist, or fully assembled and tested, the PAT-4 harmonizes with the Dynaco FM-3 stereo tuner and is directly interchangeable with the PAS-3X in cabinet installations.

The PAT-4 exemplifies Dynaco's long-standing reputation for excellence achieved through innovation and a constant striving for simplicity in both engineering and operation. A remarkably low level of noise and distortion has been achieved - below the level which can be measured with commercial grade test equipment - through the use of carefully selected silicon transistors in a circuit utilizing both DC and AC feedback. Frequency response is extremely wide to prevent deformation of square waves and other signals which depend on wide-band, low phase shift response for accurate reproduction. Overall performance superior to all other transistorized preamplifiers is assured.

An important specification frequently overlooked in evaluating preamplifiers is phono overload capability. The PAT-4, with its 80 mV phono overload point, cannot be overloaded by any magnetic cartridge made today. Transistorized preamplifiers in particular frequently have had poor phono overload characteristics and in the absence of any such overload specification, you have no assurance that the phono stage will not distort severely on many loud passages.

 

The PAT-4 kit is supplied with two identical preassembled etched circuit boards which include virtually all the components except the power supply and the controls, greatly simplifying and speeding construction of the kit, and assuring operation and absolute reproducibility on completion. Each circuit board has been in circuit tested prior to shipment. An open, uncluttered chassis layout provides ready acces for assembly and trouble shooting.

Like all Dynaco products, the PAT-4 is the culmination of years of painstaking design. It has been acclaimed by renowed audio experts, like Julian Hirsch, who wrote in Stereo Review ; "in sonic quality, we would unhesitatingly say that the Dynaco PAT-4 is unsurpassed by any preamplifier we have seen, … a remarkable unit and unmatched at anywhere near its low price …"

 

Specifications

Frequency Response: 

High level Inputs :  10 Hz - 100 kHz ±0,5 dB

Low level Inputs :  20 Hz - 20 kHz ±1 dB

Distortion (at rated 2 volt output):  less than 0,05% (20 Hz - 20 kHz)

IM Distortion:  less than 0,05% with any combinaation of test frequencies

Hum and Noise:

Magnetic phono :  70 dB belowa 10 mV input signal

High level :  85 dB below a 0,5 volt input signal

Gain

Magnetic Phono :  54 dB at 1000 Hz (3mv for 1,5 V out)

High Level :  20 dB (.15 V for 1,5 V out)

Tone Control Range

Bass :  ±16 dB at 50 Hz

Treble ;  ±12 dB at 10 kHz

Maximum Output:  10 Volts into high impedance; 5 Volts into 600 ohms

Impedances:

Magnetic Phono :  47 k Ω

To tape :  from Low level inputs  600 Ω

Tape Head :  100 k Ω

High Level :  100 k Ω

To Tape : from High level inputs same as source

Audio Output :  600 Ω

Amplifier Input :  Nominal load 10 k Ω or higher

Inputs:

Low level or High level RIAA magnetic phono or ceramic phono;

NAB 7-1/2" tape head;

Special (normally microphone)

Tape amplifier

Tuner

Spare High level for TV, etc

Front panel High level

Outputs;

Tape output Ahead of controls

2 Audio outputs (one switched by front panel jack)

Front panell output

Front panel Controls

Selector switch; Volume control; balance control; 2 bass controls; 2 Treble controls;  High Filter switch at 15 kHz, 10 kHz and 7 kHz; Loudness Compensation switch; tape Monitor switch; Low Filter switch; paired (A + B) with 6 dB blend for 3rd channel output, or stereo; illuminated power switch.

Semiconductor Complement:  8 Transistors; 2 Diodes

Power Consumption:  5 watts 120/240 V 50/60 Hz AC

Dimensions (W x H x D):  13-1/2" x 9" x 4-1/4"

Weight (shipping):  4,5 kg (10 lbs)

Pioneer SA-900 amplifier

Model SA-900 is an professional-type all silicon solid state pre/main stereo amplifier.

The SA-900 is one of Pioneer's most advanced amplifiers. It contains professional features nestly compacted into an all solid state set that's ideal for use with high performance stereo systems. It presents a powerful 200 watt integrated amplifier of exceptional flexibility. Only the finest and most expensive materials have been used throughout, from the low noise silicon transistors in the MC and front end sections to the special Brazilian rosewood tipping the front panel. The control amplifier has FET end advanced 3-stage E-S (Emitter-Source) feedback circuitry. The pre and main amplifiers can be used independently and there are inputs for a wide variety of cartridges and 2 sets of speaker terminals.

 

Features

Preamplifier is composed of three precision made sections.

MC Section: using very special low-noise transistors, this section adequately amplifies low output moving coil cartridges. Has very low noise level.

Front-end Section: uses low-noise silicon transistors and a direct coupled 3-stage E-E feedback circuit, resulting in significantly better frequency response, a decrease in harmonic distorion and improved tonal quality.

Control Amplifier Section: features FET and a direct-couples 3-stages E-S feedback circuit. Gives a high S/N ratio, and minimal distortion.

Truly Precise Tone Controls

Despite their markings, most sets have controls  that are very approximate. In fact, they are not usually flat even when set at flat. The SA-900 is radically different. Set its tone controls at flat, and the signal really comes out flat. Accurate 3 dB step controls for individual bass and treble adjustment.

Power-Packed main Amplifier

This superior main amplifier puts out a full 145  watts at 8 ohms with distortion under 0,5% (IHF music power). That is more than enough to fill a concert hall. Damping factor is better than 67 at 8 ohms. Silicon varistor is used for temperature compensation and stable performance at all times.

Independent use of Pre and Main Amplifier

A selector switch on the rear panel allows independent use of pre and main amps, desirable for multi-channel systems. The preamplifier is designed to be used as a control amplifier.

Exceptional Flexibility -  unusual Range of Inputs and Outputs

The SA-900 features, for example, two phono inputs. By means of push-button selection, one input accomodates either a high output MM type cartridge or a low output MC cartridge. Naturally  there's tape monitor for Tape/Source comparsion, and  there are also two sets of speaker outputs.

A Host of Audio Refinements

A few Pioneer extras include Hi and Low filters, and a special muting switch of -20 dB. And the SA-900 can also be used as a channel amplifier by setting the channel filter between pre and main amplifier sections.

 

Specifications

Audio Section

Circuitry:  Quasi-complementary single ended push-pull

Music Power Output:

200 Watts at 4 Ω  (distirtion below 0,3% at 1 kHz/IHF)

145 Watts at 8 Ω  (distortion below 0,3% at 1 kHz/IHF)

Continuous Power Output:

84 W / 84 W at 4 Ω  (distortion below 0,3% at 1 kHz)

60 W / 60 W at 8 Ω  (distortion below 0,3% at 1 kHz)

Continuous Power Output  (both Channels driven)

64 W + 64 W at 4 Ω  (distortion below 0,3% at 1 kHz)

50 W + 50 W at 8 Ω  (distortion below 0,3% at 1 kHz)

Total Harmonic Distortion: less than 0,08% ( 45 W at 1 kHz)

Frequency Response:  20 Hz to 50 kHz ±1 dB

Power Bandwidth:  20 Hz to 50 kHz (distortion below 0,3% constant/IHF)

Signal-to-Noise Ratio: 

Phono :  better than 85 dB

Aux :  better than 95 dB (volume, maximum, tone flat, at the rated output/IHF)

Inputs Sensitivity/Impedance (at 1 kHz)

Phono MM :  3,1 mV/ 50 k Ω 

Phono MC :  0,155 mV/ 150 k Ω 

Phono CER :  71 mV/ 100 k Ω 

MIC :  1,9 mV /50 k Ω 

Tuner :  180 mV / 200 k Ω 

Tape Monitor :  180 mV / 200 k Ω 

Tape head :  1,8 mV / 150 k Ω 

Aux :  180 mV / 200 k Ω

Main-In :  500 mV / 100 k Ω   

Damping Factor:  better than 67 at 8 Ω  (at 1 kHz)

Output Terminals and Jacks

Speakers :  4 to 16 Ω

Stereo Headphones Jack, Pre-Out :  3 V

Simultaneous Tape Recording :  180 mV

Tape Recording/playback Jack :  DIN standard

Center Channel Output :  500 mV

Equalization Curves: 

Phono ;  NFB type RIAA,

Tape :  NFB type NAB

Tone Controls (3 dB step)

Bass :  -9 dB to +12 dB at 100 Hz

Treble :  -12 dB to +9 dB at 10 kHz

Filters: 

Low :  -6 dB ( 12 dB/oct) at 50 Hz

High :  -6 dB  (12 dB/oct) at 10 kHz

Loudness Contour:  Switchable to On-Off

+14 dB at 50 Hz

+7 dB at 10 kHz

Residual Noise:  less than 0,8 mV at 8 Ω  (volume, mninmum, tone flat)

Muting :  -20 dB (switchable On/Off)

Crosstalk (1 kHz):

Aux :  less than -50 dB

Phono :   less than -48 dB

Power Supply:  Bridge rectifier using silicon diodes

Power Requirements:  110, 117, 130, 220, 240 Volts (switchable) 50/60 Hz AC

Power Consumption:  250 VA (max)

Dimensions (W x H x D):  405 x 140 x 339 mm (1-15/16" x 5-1/2" x 13-11/32")

Weight (Net):  12,3 kg  (27 lbs)

Pioneer SA-700 amplifier

Model SA-700 is a powerful, 120 W integrated amplifier of exceptional flexibility. New advanced circuitry for new levels in distortion-free stereo.

Pioneer  announcies a new kind of integrated amplifier. Designed to more than, meet all the demands of modern stereo, the SA-700 offers a combination of advances that were never available on unit before. First, there's power, a full 120 watts of non-clip music power ( at 4 ohms). Second, Pioneer, has used only the finest and most expensive materials, such as specially selected low noise transistors for the MC and front end sections, and FET in the control amplifier section. Third, the most advanced circuitry has been used throughout; a 3 stage E-S (emmiter-source) feedback circuit in the control amplifier is typical. Finally, this exceptional unit is exceptionally flexible. preamplifier and main amplifier can be used independently; there are inputs for a wide variety of cartridges, and two sets of speaker terminals. the SA-700 is truly for those who want to enjoy all the musical realism that modern stereophonic reproduction now makes possible.

 

Features

Preamplifier is composed of three precision made sections.

MC Section: using very special transistors, this section adequately amplifies low output moving coil cartridges. Very low noise level.

Front-end Section: using silicon transistors and a direct coupled 3-stage E-E feedback circuit, significantly superior stability and tonal quality results.

Control Amplifier Section: features FET and a direct-couples 3-stages E-S feedback circuit, high S/N ratio, and minimal distortion due to impedance variations.

Truly Precise Tone Controls

Despite their markings, most controls are very approximate. In fact, they are usually not flat even when set at flat. The SA-700 is radically different, set these tone controls at flat, and the signal really comes out flat. Accurate 3 dB step controls for wide range bass and treble adjustment.

Power-Packed main Amplifier

This superior main amplifier puts out 85 full watts at 8 ohms with distortion under 0,5% (IHF music power). That is more than enough to fill a concert hall. And with low-efficiency 4 Ω  speakers, 120 watts are available.

Independent use of Pre and Main Amplifier

This is possible by simply sliding a switch. Desirable for multi-unit systems, for controling an additional amplifier, etc.

Exceptional Flexibility -  unusual Range of Inputs and Outputs

The SA-700 features, for example, two phono inputs, and the second, by means of push-button selection, perfectly accomodates either a high output MM cartridge or a low output MC cartridge. Naturally  there's tape monitor for Tape/Source comparsion. There are also two sets of speaker outputs.

A Host of Audio Refinements

A few Pioneer extras include Hi and Low filters, a tested loudness control, and a special muting switch of -20 dB.

 

Specifications

Audio Section

Circuitry:  Quasi-complementary single ended push-pull

Music Power Output:

120 Watts at 4 Ω  (distirtion below 0,5% IHF)

85 Watts at 8 Ω  (distortion below 0,5% IHF)

Continuous Power Output:

44 W / 44 W at 4 Ω  (distortion below 0,5% at 1 kHz)

34 W / 34 W at 8 Ω  (distortion below 0,5% at 1 kHz)

Continuous Power Output  (both Channels driven)

31 W + 31 W at 4 Ω  (distortion below 0,5% at 1 kHz)

27 W + 27 W at 8 Ω  (distortion below 0,5% at 1 kHz)

Total Harmonic Distortion:less than 0,05% ( 20 W at 1 kHz)

Frequency Response:  20 Hz to 40 kHz ±1 dB

Power Bandwidth:  15 Hz to 60 kHz (distortion below 0,5% constant/IHF)

Signal-to-Noise Ratio: 

Phono MM :  85 dB

Aux :  100 dB (volume, maximum, tone flat, at the rated output/IHF)

Inputs and Gain (for Rated Output)

Phono 1, Phono 2 (MM):  3 mV

Phono 2 (MC) :  0,12 mV

Main-in :  500 mV

Tuner :  200 mV

Tape Monitor :  200 mV

Aux :  200 mV

Damping Factor:  better than 40 at 8 Ω  (at 1 kHz)

Output Terminals and Jacks

Speakers :  4 to 16 Ω

Stereo headphones jack; Simultaneous Tape Recording jack; Tape Recording/playback Jack (DIN standard); Pre-amplifier output terminal; Center channel output terminal

Equalization Curves:  Phono RIAA, Tape NAB

Tone Controls (3 dB step)

Bass :  -9 dB to +12 dB at 100 Hz

Treble :  -12 dB to +9 dB at 10 kHz

Filters: 

Low :  -8,4 dB at 50 Hz

High :  -7,8 dB at 10 kHz

Loudness Contour:  Switchable to On-Off

+13 dB at 50 Hz

+4 dB at 10 kHz

Residual Noise:  less than 0,7 mV at 8 Ω  (volume, mninmum, tone flat)

Muting :  -20 dB (switchable On/Off)

CrossTalk:

Aux :  47 dB

Phono MM :  49 dB

Power Supply:  110, 117, 130, 220, 240 Volts (switchable) 50/60 Hz

Power Consumption:  190 VA (max)

Dimensions (W x H x D):  370 x 118 x 314 mm (14-9/16" x 4-5/6" x 12-5/16")

Weight (Net):  8 kg  (17 lbs 10 oz)

Revox B 791 turntable

 

With the B791 (and B795) turntables, tangential tracking has been brought to the point of perfection. While conventional reproduction systems offer good compromises, Revox solves some problems that were once thought unsolvable. Disadvantages resulting from the opposing physical forces inherent in disc reproduction have been overcome by significant engineering breakthroughs. New solutions have made Revox the leader in turntable technology.

Pivoting Tonearm Module

The revox concept of a pivoting tonearm module, together with the ultra-short tangential tonearm, represents a successful synthesis of technical innovation and mechanical perfection. In this exclusive design the usual resonance problems of tubular tonearms have been eliminated and the threat of damage to either disc or cartridge stylus has become a thing of the past.

An electronic servo control keeps the stylus tracking precisely in the center of the record groove, thus avoiding playback distortions. Record warps and eccentricities are no problem. The result is a light, delicate tracking of your valuable discs from the first groove to the last.

 

Quartz-Crystal for Constant Speed

Developed and manufactured by Revox, the B791 (and B795) motor is Quartz controlled and drives the plater directly. Therefore,, use of a constant dust-removing device will not alter the locked-in speed. On the B791 the speed can be changed from -9,9% to +9,9% in precise o,1% steps, with a digital display showing the Variation. This allows the audiophile to obtain unlimited nuances for special effects, and also facilitates quick tuning of a record to a musical instrument.

 

Changing Cartridges

With Revox turntables you are not limited to the use of one cartridge. Four premium cartridges are available, factory installed and optimally adjusted. Of course you can also install practically any other cartridge that follows the international mounting norms.

 

Advanced Technology, Simple Operation

Ease of operation is practically a revox trademark, and here it begins with automatic cleaning of the stylus tip. A built-in light aids in finding specifica musical selections. All functions are activated by front panel buttons which may be operated even with the dust cover closed. With the development of the B791 (and B795), revox is once again leading the way. Precision, advanced technology, long-term reliability, and intelligent design are hallmarks of superiority.

 

Automatic Functions:

When swinging in the tone arm support - Platter starts to rotate at preselected speed

When swinging out the tone arm support - Cartridge lifts off immediately; Cartridge returns to start position; Platter stops, stylus illumination switches off

Operating

Platter Drive :  Power Switch; Two tactile feedback keys for selection speeds

Carriage:  Three tactile feedback keys for fast inward and outward movement as well as lifting and lowering the cartridge; built-in cartridge illumination

Speed:  Two tactile feedback keys for increasing or decreasing the platter speed.

Display:  5-Digit display for nominal speed and deviation in percent

Specifications:

Platter Drive:  Quartz- controlled direct drive system

Platter Speeds:  33 and 45 RPM

Speed Adjust. Range:  ±09,9%, quartz accurate

Speed Stability:  ±0,01%

Speed Indications:  Speed and synchro indicator (33 and 45 RPM)

Platter:

Diameter :  313 mm (12,32")

Weight :  2,1 kg (4 lbs 10 oz)

Acceleration Time:  less than 2 sec. to 33 RPM

Deceleration Time:  less than 2 sec. from 45 to 33 RPM

Wow and Flutter:

Weighted :  better than 0,05%

Linear :  better than 0,1%

Rumble (Unweighted):  better than -50 dB (DIN 45539A)

Rumble (Unweigted with 20 Hz high-pass:  better than -52 dB (DIN 45539A)

Rumble (Weighted):  better than -72 dB (DIN 45539B)

Tone-arm:

Linear-tracking tone arm with servoelectronic follow-up control

Tangential Tracking Error:  smaller than 0,5°

Skating Compensation:  Not required with a tangentially tracking system

Stylus Force:  Adjustable with balance weight from 8 to 20 mN (0,8 to 2 p)

Tone-arm Lowering:  Electronically controlled, pneumatically damped

Muting:  Electronic muting until stylus contacts record (approx. 1 s)

Tone-arm Follow-up:  Optoelectronic sensing with LED as light source; servoelectronics an DC motor

Run-out Switch:  Automatically activated by servoelectronics

General

Semiconductors Components:  31 ICs, 46 Transistors; 45 Diodes; 4 LEDs; 2 Bridge rectifiers; 5 seven-segment displays

Power Requirements:  100/110/120 V 200/220/240 V ; 50/60 Hz

Power Consumption:  30 W max

Power Fuse

0,4 A (slow-blow) :  100 - 120 V

0,2 A (slow-blow) :  200 - 240 V

Dimensions (W x H x D):  449 x 142 x 395 mm (17,7" x 5,5" x 15,6")

Weight:  9,1 kg (20 lbs)

Revox B 795 turntable

 

Automatic Functions:

When swinging in the tone arm support - Platter starts to rotate at preselected speed

When swinging out the tone arm support - Cartridge lifts off immediately; Cartridge returns to start position; Platter stops, stylus illumination switches off

Operating

Platter Drive :  Power Switch; Two tactile feedback keys for selection speeds

Carriage:  Three tactile feedback keys for fast inward and outward movement as well as lifting and lowering the cartridge; built-in cartridge illumination

Specifications:

Platter Drive:  Quartz- controlled direct drive system

Platter Speeds:  33 and 45 RPM

Speed Stability:  ±0,01%

Speed Indications:  Speed and synchro indicator (33 and 45 RPM)

Platter:

Diameter :  313 mm (12,32")

Weight :  2,1 kg (4 lbs 10 oz)

Acceleration Time:  less than 2 sec. to 33 RPM

Deceleration Time:  less than 2 sec. from 45 to 33 RPM

Wow and Flutter:

Weighted :  better than 0,05%

Linear :  better than 0,1%

Rumble (Unweighted):  better than -48 dB (DIN 45539A)

Rumble (Unweigted with 20 Hz high-pass):  better than -50 dB (DIN 45539A)

Rumble (Weighted):  better than -70 dB (DIN 45539B)

Tone-arm:

Linear-tracking tone arm with servoelectronic follow-up control

Tangential Tracking Error:  smaller than 0,5°

Skating Compensation:  Not required with a tangentially tracking system

Stylus Force:  Adjustable with balance weight from 8 to 20 mN (0,8 to 2 p)

Tone-arm Lowering:  Elecrtonically controlled, pneumatically damped

Muting:  Electronic muting until stylus contacts record

Tone-arm Follow-up:  Optoelectronic sensing with LED as light source; servoelectronics an DC motor

Run-out Switch:  Automatically activated by servoelectronics

General

Semiconductors Components:  21 ICs, 19 Transistors; 29 Diodes; 4 LEDs; 2 Bridge rectifiers

Power Requirements:  100/110/120 V 200/220/240 V ; 50/60 Hz

Power Consumption:  30 W max

Power Fuse

0,4 A (slow-blow) :  100 - 120 V

0,2 A (slow-blow) :  200 - 240 V

Dimensions (W x H x D):  449 x 142 x 395 mm (17,7" x 5,5" x 15,6")

Weight:  9,1 kg (20 lbs)

Eumig Metropolitan Concert cassette deck

Eumig introduces a :new concept" in quality cassette decks for in-home and professional use with the Eumig Metropolitan Concert cassette deck.. The unit uses a unique opto-electronic servo system for "ultra-precise" control of the capstan drive. Instead of belts and flywheels to turn the capstan, the Eumig makes use of a ligtweight disc that is photo-etched with 2500 precisely spaced radii to create 15,000 pulses per second as the capstan rotates them past an optical sensor. By comparing the counted pulse-rate against a fixed reference, it's possible to apply continuous speed corrections to the capstan motor in a matter of mere microseconds. The result; wow and flutter is reduced to an extraordinarily low 0,05% WRMS, according to Eumig. The deck has three heads and a solenoid logic tape transport. Peak recording level is indicated by two parallel columns of LEDs; since these are inertia-less, they supply instant values, unlike the much slower ballistic type VU meters. There's a mixing panel to handle two inputs per channel with automotive or manual level control. The CCd also uses three LEDs to indicate the type of tape. Bias and equalizataion switching for chromium dioxide tape is automatic. Signal-to-Noise ratio with Dolby is 66 dB for ferric-oxide, 68 dB for CrO₂ and 72 for ferichrome tapes.

Sony TA-535R amplifier

Stereo Interated Amplifier System : 

Pre Section :  Low-noise, Equalizer amplifier

Power Section :  Pure-complementary SEPP OCL Power amp with all stages directly coupled

 

Specifications

Continuous Power Output RMS both channels driven

DIN 1 kHz  :  110 W + 110 W (4 Ω ); 90 W + 90 W (8 Ω )

20 Hz - 20 kHz :  80 W + 80 W (4 Ω ); 75 W + 75 W (8 Ω )

Input Sensitivity/Impedance

Phono MM :  2,0 mV/50 k Ω

Phono MC :  0,25 mV/100 Ω

Tuner, CD, Aux, DAT, Tape 1, 2 :  150 mV/50 k Ω

Output Load /Impedance

Rec Out:  150 mV/1 k Ω

Speakers :  4 - 16 Ω

Headphones :  accepts low and high impedance

Total Harmonic Distortion:  less than 0,008% at 10 W output

Intermodulation Distortion (60 Hz : 7 kHz = 4 : 1):  less than 0,008% at 10 W output

Frequency Response:

Phono :  RIAA equalization curve ±0,5 dB

Tuner, CD, Aux. DAT/Tape 1, Tape 2 :  7 Hz - 100 kHz (+0 -3 dB)

Residual Noise:  less than 170 µV (Network A)

Damping Factor :  70 (8 Ω , 1 kHz)

Signal-to-Noise Ratio :

Phono MM :  94 dB

Phono MC :  76 dB

Tuner, CD, Aux, DAT, Tape 1, 2 :  103 dB

Tone Controls

Bass :  ±7 dB at 100 Hz (300 Hz turnover frequency)

Treble ;  ± 6 dB at 10 kHz (5 kHz turnover frequency)

Power Requirements:  220 V - 230 V  AC , 50/60 Hz

Power Consumption:  230 W

Dimensions (W x H x D):  430 x 150 x 375 mm (17" x 6" x 14-7/8")

Weight:  9,7 kg (21 lb 7 oz)