Hafler DH-120 power amplifier

The DH-120 may shatter the illusions of some audiophiles in their search for perfection with ever larger, heavier and more costly amplifiers. It demonstrates once again that quality, not quantity, is the deciding sonic factor. Engineered for adequate power, proper headroom and excellent overload characteristics, together with conservative ratings, the DH-120 surpasses in sound quality many amplifiers of substantially higher advertised output.

To the technically knowledgeable observer, the DH-120 is quite elegant. Its novel drive circuit is extraordinarily linear. Its very low distortion is achieved with relatively little negative feedback. The oversized heat sinks and power supply, the careful selection of critical components for their sonic attributes, and the evident product quality demonstrates our commitment to excellence.

The most important design element is the utilization of power MOSFET output devices MOSFET advantages include self-stabilization  robustness linearity, high speed, vaccum tibe-like characteristics and they require no thermal compensation. Because MOSFETs can handle heavy currents current limiting circuits are not required.

The audio enthusiast will appreciate the extra features which make the DH-120 more versatile than conventional amplifiers. Independent level controls on each channel are valuable for such applications as bi-amplification. For those needing higher power in a small package a back panel switch converts to a bridged mono mode which uses both channels to deliver in excess of 125 watts. If separate speakers are to be used in another area, a second set of speaker terminals is provided. Alternatively, these terminals can be switched to power rear speakers to add ambience recovery to the main system.

Hafler ingenuity has developed a uniquely simple and effective means of recovering heretofore inaccessible sonic details which have been hidden in many recordings and broadcasts. These elusive signals consist of reflected and reverberant sounds which contribute the sense of space and depth in the recording location. When these sounds are reintroduced through loudspeakers placed behind the listener using the Hafler Ambience Recovery System you will find a new sense of immediacy and involvement emerging from many of your familiar recordings.

 

Specifications

Power rating:  less than 0,009% Total Harmonic Distortion at any power level up to 62 watts continuous average power per channel into 8 Ω  at any frequency between 20 Hz and 20 kHz with both channels driven.

Intermodulation DIstortion (SMPTE): less than 0,005% from 1 watt in 62 watts each channel into 8 Ω

Total Harmonic Distortion : 0,002% (8 Ω , 1 kHz)

Frequency Response (at 8 Ω )

At 1 watt :  4 Hz - 200 kHz -3db

At 62 watts :  10 Hz -40 kHz +0 -1/2 dB

Typical Channel Separation: 

20 Hz :  better than 75 dB

1 kHz :  better than 85 dB

20 kHz :  better than 65 dB

Signal-to-Noise Ratio (Unweighted):  exceeded 103 dB referred to 62 watts into 8 Ω

Input Impedance:  22,000 Ω

Input Sensitivity:  11 volts rms for 62 watts into 8 Ω

Damping Factor:  100 to 1 kHz into 8 Ω ; 50 to 10 kHz into 8 Ω

Rise Time:  10 kHz, 45 volts peak to peak square wave, 10% to 90%, 2 µs

Slew Rate:  10 kHz, 45 volts peak to peak square wave, 30 V µs

Semiconductors:  22 Transistors; 4 Power MOSFETs; 23 Diodes; 8 Zener Diodes; 1 Diode Bridge

Power Consumption:  62 watts both channels into 8 Ω , 300 VA

Dimensions (W x H x D):  15-3/8" x 3-1/2" x 9"

Weight:  18 lbs Net

 

Hafler DH-110 preamplifier

The DH-110's low noise and distortion, versatily control center is the standard bearer of the Hafler line. The DH-110 challenges comparison at any price on any criteria.

The improvements the DH-110 lends to your system are obvious the moment you start to listen. A three-dimensional image takes shape, acoustics are more accurate, voices are more precise transients are more articulate.. With the DH-110 reproduced sound becomes real.

Facilities include two magnetic phono inputs, two complete tape circuits with monitoring facilities and LED indication of monitoring mode a separate input-output loop for an equalizer or other signal processor a switchable highpass filter easy conversion to rack mounting (adapters are supplied), a front panel jack for most high impedance headphones, or for tape recording, and two pairs of audio outputs - one of which is switched by the headphone jack for private listening.

The full complementary symmetry circuit employs all discrete silicon transistors - no ICs. Precisions components hold very tight tolerances on inter-channel balance and RIAA equalization. This assures accurate phase relationships for correct spatial perspectives. An integral muting circuit eliminates turn-on and turn-off annoyances. The precision volume control ,maintains accurate balance between channels. The tone controls are effective while audibly unobtrusive but may be totally bypassed.

Less obvious significant refinements include a full power bandwidth that extends to 200 kHz, easily accommodating problem signals, a low impedance power supply; the use of low distortion low dielectric loss capacitors; silver plated contacts on the selector switches for long term noise-free operation; internal grounding of unused inputs for lower crosstalk; internal sockets for phono loading capacitors to accommodate specific cartridges; and a very wide phono acceptance level to handle the full dynamic range of the best cartridges.

 

Specifications

Phono Preamplifier Section

Rated Output:  3 V rms, 8 Hz to 105 kHz

Max. Output: 12 V rms at Rec Out

Total Harmonic Distortion :  0,0006% at 3 V rms

RIAA Frequency Response :  20 Hz - 20 kHz +0 dB  -0,25 dB

RIAA Equalization Accuracy:  30 Hz to 15 kHz +0 dB -0,1 dB

Sensitivity (1/2Volt at Rec Out) :  10 mV

Max. Input Signal (at 1 kHz):  300 mV (3 V at 20 kHz)

Gain:  34 dB at 1 kHz

Input Impedance:  47 k Ω  in parallel with 30 pF. User Adjustable. Plug in capacitors are installed to increase this to 150 pF/Phono1; 250 pF/Phono 2

Signal-to-Noise Ratio:  87 dB below 0,5 Volt output

Slew rate:  12 Volts per microseconds

Line Amplifier Section

Rated Output:  3 V rms 4 Hz to 210 kHz

Max. Output:  14 V rms, 20 Hz to 20 kHz

Total Harmonic Distortion less than 0,001%

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

Sensitivity:  50 milivolts

Max. Input Signal (at 1 kHz): 14 V rms, volume control at -20 dB

Gain:  20 dB

Input Impedance:  better than25 k Ω

Signal-to-Noise Ratio:  105 dB

Slew Rate:  12 Volts /µsec

Crosstalk:  72 dB down

Separation:  better than 82 dB at 1 kHz; 52 dB at 20 kHz

Bass Control:  ±17 dB at 20 Hz (variable turnover)

Treble Control:  ±17 dB at 20 kHz (shelving at 5 kHz)

Filter Control:  25 kHz -12 dB/oct

General Specifications

Semiconductors:  30 Transistors; 3 ICs; 12 Diode; 2 LEDs

Inputs:  2 x Phono, Tuner, Aux, 2 x Tape, EPL

Outputs:  2 x Tape (buffered), 2 x Line EPL, Headphone jack

Intermodulation Distortion:  below residual of instrumentation

AC Power:  100 - 130 and 200 - 260 V, 50/60 Hz 3,5 Watts

AC Convenience Outlets:  2 switched 1 unswitched

Dimensions  (W x H x D):  17" x 3" x 8-1/2" + 1: knobs, 19" rack mounting

Weight:  10 lbs net

 

Harman/Kardon hk750 amplifier

The new hk750 is the logical extension of our widely acclaimed 700 Series High Technology Separates - a sophisticated integrated amplifier that produces 45 watts per channel into 8 Ω

As with the rest of the 700 Series, the 750 has been designed with low negative feedback to keep TIM and Total Harmonic Distortion well below audible levels.

The 750 also has features you might not expect on other comparable integrated amps. Like a 5 stage, fully discrete phono pre-amp section that's extremely fast and quiet. Plus a toroidal power supply that can easily handle two pairs of speakers while substantially reducing both hum and stray noise. Two tape copy/monitor positions are provided for dubbing and monitoring. And the 750 also features loudness control, subsonic and hi cut filters, as well as tone defeat.

The hk750 integrated amplifier is the pefect solution for the audiophile who wants the sophistication of our High Technology Separates with the simplicity and economy of an integrated amplifier.

 

Specifications:

RMS Power (20 - 20,000 Hz into 8 Ω , less than 0,03% T.H.D.) :  45 watts

Frequency Response (at rated output):  below 1 Hz - 150 kHz (-3 dB)

Intermodulation DIstortion :  0,05%

TIM Distortion (at rated output):  0,01%

Slew Rate/Power Amplifier:  60 Volts/µsec

Overall Negative Feedback:  25 dB

Hum and Noise (A Weighted):

Phono :  -88 dB

Aux :  -100 dB

Residual :  -100 dB

Phono Overload:  better than 150 mV

 

Harman/Kardon hk680i receiver

The hk680i, with 60 watts per channel, is the first Harman Kardon receiver ever with the advanced technology of digital quartz-locked tuning. That means the tuner section automatically locks into the exact dead center of the broadcast signal every time. And stays there drift-free.

The 680i also features a memory system that allows you to store up to 6 AM and 6 FM stations, and recall them at the touch of a button. And tuning couldn't be easier. You can tune up or down manually by pressing one of the tuning buttons, or you can let the receiver scan automatically for you.

Each time the scanner reaches a station, it will stop and allow the station to play for several seconds. It will continue scanning and playing until you find the station you want and defeat the scanning system.

In addition, the 680i gives you other convenience features. Like tape copy and tape monitoring capabilities for two decks. Tone defeat. Subsonic and high filters. Muting defeat and more.

The hk680i. It brings the accuracy of digital technology to an affordable receiver.

 

Specifications

Amplifier Section

RMS Power Into 8 Ω  (20 -20,000 Hz) :  60 watts at less than 0,02% T.H.D.

Frequency Response:  below 1 Hz - 150 kHz (-3 dB) at rated output

Intermodulation Distortion: 0,04% at rated output

TIM Distortion:  0,009% at rated output

Slew Rate/Power Amplifier:  65 volts/µsec

Overall Negative Feedback:  25 dB

Hum and Noise "A" WTD:

Phono :  -88 dB

Aux, Residual:  -100 dB,

Phono Overload:  better than 225 mV

Tuner Section

FM Sensitivity

Mono 300 Ω  :  1,8 µV (10,3 dBf)

50 dB Quieting Sensitivity

Mono 300 Ω  :  3,0 µV (14,8 dBf)

Stereo 300 Ω  :  35 µV (36,1 dBf)

FN Noise:  -75 dB

Capture Ratio:  1,2 dB

Alternate Channel Selectivity:  -80 dB

Stereo Separation (1 kHz):  55 dB

FM Frequency Response at Detector Output:  DC -100 kHz (-3 dB)

AM Sensitivity:  300 µV/m

Dimensions (W x H x D):  443 x 122 x 390 mm

Weight:  12 kg

 

Hitachi HS-1 M loudspeakers

Miniature Speaker System

If you're looking for big, high-quality sound but don't have the space to accommodate a big system, the HS-1M Miniature Speaker System is sure to satisfy you.

Just 185 mm high (not much more than a large book), these speakers can be placed almost anywhere - and they're portable too.

Optional mounting brackets permit free-angle installation on walls, ceilings, on the new window shelf of your car for maximum space savings.

Maximum power handling capacity is is a mammoth 80 watts, and output sound pressure level is an impressive 85 dB. So even if you own a large power amplifier, there's no worry of damaging or distorting these speakers. They'll give you plenty of output from small amps as well.

 

Woofer

The HS-1M woofer is 4-inch cone-types employing carefully selected cone paper for maximum fidelity and strength. Remarkably smooth reproduction from powerful bas to rich midrange is assured thanks to the incorporation of special Hitachi Actuators, special low-distortion magnetic circuits in which the center pole is covered with a cooper short cap. This unique feature minimizes high-frequency distortion due to interaction between the voice coil and magnetic circuit, permitting only the purest of sounds to come through.

High power handling capacity is realized through the use of a thermo setting adhesive with superior thermal properties for the voice coil and bobbin.

 

Tweeter

Titanium-dome, an extremely light, but durable, metalic element is used for the HS-1M tweeter dome, providing uniform quality and low distortion. The small size of dome itself permits wide frequency response and excellent dispersion.

Accurate spatial imaging and resolution in the HS-1M is amazing for their size. This is due to careful design , and to the selection of 2,700 Hz for the crossover frequency.

 

Solid Diecast Aluminum Cabinet

The HS-1M enclosures are precision-processed diecast aluminum alloy. This virtually eliminates the possibility of box resonance, buzzes and rattles or air leaks. You get dynamic, resonant-free reproduction over the entire audible spectrum.

 

Specifications

Type:  2-way closed

Enclosure Volume:  1,6 liters

Speakers

Woofer :  4" (100 mm) Cone

Tweeter :  1" (25 mm ) Dome

Crossover Frequency:  2,700 Hz

Frequency Response:  50 Hz - 20,000 Hz (-15 dB)

Impedance:  8 Ω

Sound Pressure Level:  85 dB (1W/1m)

Maximum Input Power:  50 Watts; (80 Watts Music)

Enclosure Finish:  Black (painted)

Grill Cover:  Black

Dimensions (W x H x D):  4-5/8" x 2-1/4" x 4-3/4"

Weight:  2,5 kg (5 lb 8 oz)

 

Hitachi HS-335 loudspeakers

High Fidelity 3-way Speaker System

3-way speaker system with 10-inch woofer, 5-inch mid-range and 1-inch dome tweeter

Excellent sound reproduction capability

Beautiful walnut grain finish cabinet for long life.

 

The Hitachi model HS/335 high fidelity loudspeaker reflects all the refinements of the "state-of-the-art." acoustic design while incorporating fine cabinetry to compliment any decor.

The unit features a 10-inch rolled edge woofer with aluminum voice coil bobbin and carbon fiber cone giving rich bass response with low distortion. The HS/335 also features a 5-inch mid-range cone and a 1-inch titanium diaphragm dome tweeter. Frequency response of the HS/335 is 45 Hz to 18 kHz ±4 dB.

Crossover points are a 700 Hz and 3000 Hz . The speaker box itself is a sealed acoustic suspension structure with a 38 litre cubic volume.

Sound pressure levels of 91 dB (8 Ω ) 1m/1 W, are generated, representative of the efficiency of this unit.

The speaker cabinet exterior is wood grain vinyl on wood products and is finished with handsome removable matte charcoal brown grille cloth.

 

Specifications

Speakers

Woofer :  10" rolled edge type woofer with aluminum voice coil bobbin and carbon fiber cone

Mid-range :  5" cone driver

Tweeter :  1" titanium dome driver

Crossover Frequency:  700 Hz, 3000 Hz

Cabinet:  Wood grain vinyl on wood products. Charcoal brown removable grille cloth. Sealed acoustic suspension 38 litre cubic volume

Frequency Response:  45 Hz - 18,000 Hz ±4 dB

Sound Pressure Level: 91 dB 1m/1W

Tweeter Level Control:  0 - 3 dB

Dimensions (W x H x D):  12-3/8" x 21-5/8" x 12-3/8"

Weight:  28,6 lbs

 

JVC DD-7 cassette-deck

Direct-Drive Cassette Deck DD-7 features:

Quartz-lock, direct-drive mechanism with Pulse Servo motor

Three-head configuration - Monitor capability with the X-cut SA combination Rec/Play head and extended highs

Two-colour digital fluorescent level meters - Choose peak-hold or VU modes

All-DC amp configuration = Low noise and sonic clarity

Full-logic control  - Foolproof operation and touch control

Super ANRS and Dolby-B compatible ANRS

 

Direct-drive system built around the JVC Quartz-lock Pulse Servo motor

Simple is better when it comes to tape transport design. The proof is in the figures - wow and flutter is only 0,06% (DIN 45 500). Our Pulse Servo motor takes a lot of the credit, being immune to cogging, voltage fluctuations, and changes in temperature and humidity. Speed is quartz-locked to assure unblemished accuracy over the years.

 

Three-head design with JVC exclusive SA heads

The material used in our SA (Sen-Alloy) heads is capable of providing optimum results from any tape, particularly metal tape. Furthermore, we've given the Play head a narrow 1-micron gap for efficiency and a contour-free surface for extended bass, while the Rec head has a wider 4-micron gap to pick up high frequencies without loss. Our X-cut Rec and Play heads - separate but combined in a single casing - are complemented by our two-gap erase head, also of SA.

 

Monitor peak or VU level depending on your needs.

Different recording situations require different recording levels. That's why we/ve equipped the DD-7 with meters having selectable modes - peak-hold reading or VU.

 

Recording EQ: For a flat high-frequency response

The Rec EQ control allows the deck to tune itself to any tape for flat response to 15 kHz and beyond and the separate playback head lets you confirm this as you are actually making recordings.

 

Lockable timer standby mechanism ends erroneous erasure

The timer standby is locked during power outage; it can't be nudged to Rec to prevent accidental erasure

 

Memory auto rewind: Both atop and play modes.

This is a convenience feature that you shouldn't be without. It lets you continuously repeat the tape from beginning end (or from 999-indexed portion to end), or rewind the tape at the end of play.

 

Specifications

Frequency Response (At -20 VU)

Metal Tape :  25 - 18,000 Hz (±3 dB)

SA/Chrome Tape :  25 - 18,000 Hz (±3 dB)

Normal Tape :  25 - 17,000 Hz (±3 dB)

Signal-to-Noise Ratio :  60 dB (Metal Tape)

Wow and Flutter :  0,06% (DIN 45 500)

Crosstalk:  65 dB (1 kHz)

Channel Separation :  40 dB (1 kHz)

Total Harmonic Distortion

Total (0 VU, 1 kHz) :  1,0% (Metal Tape)

K3 (0 VU,  1k Hz) :  0,4 % (Metal Tape)

Heads:

Record/Playback :  Combination X-Cut SA Sen-Alloy Head

Erase :  Two-Gap SA Head

Motors:

1 x Pulse Servo Motor

1 x DC Motor

Fast Forward/Rewind Time :  85 sec. C-60 cassette

Input Sensitivity/Impedance

Mic x 2 :  0,2 mV/600 - 10 k Ω

Line In x 2 :  80 mV. 100 k Ω

Output Level/Impedance

Line Out x 2 :  0 - 500 mV/ 5 k Ω

Headphones :  0 - 0,6 mW / 8 - 1 k Ω

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

Power Consumption:  31 watts

Dimensions (W x H x D):  450 x 110 x 330 mm

Weight: 7,0 kg

 

JVC DD-5 cassette deck

Direct-Drive Cassette Deck

Direct-drive Pulse Servo motor

Newly-designed low-impedance SA head for recording/play

Two-colour digital fluorescent level meters - responsive peak reading meters

Two-motor full-logic tape transport

Super ANRS, ANRS/Dolby-B NR, Auto Rewind Play/Stop

 

JVC has not reserved our latest technological achievement - direct drive - for just our very top-of-the-line models. The DD-5 is a case in point, it uses the JVC-exclusive Pulse Servomotor and direct-drive tape transport for full reliability and wow/flutter of only 0,065 % (DIN 45 500) - one of the lowest figures ever achieved in a consumer cassette deck. Yet, one look at the DD-5 will show you many other features, like full-logic control with light-touch buttons, two-colour digital fluorescent level meters, and an SA head for metal-tape capability.

 

Direct-drive system features the JVC-designed and -manufactured Pulse Servo motor.

Unlike most cassette decks (and just about every other cassette deck in this price range), the DD-5 is endowed with a direct-drive motor for capstan drive. Eliminated are all the cams, belts, pulleys, etc., that can generate speed variations that are passed on to the tape. That's why the wow/flutter of of the DD-5 is amazingly only 0,065%. Our own top-of-the-line DD-9 is the only consumer deck in existence that can boast of a lower figure. But, direct-drive alone can't assure low wow and flutter; it look a special motor design to end cogging, our own Pulse Servo design.

 

Low-impedance SA head for improved performance

The new SA head, specially designed for the DD-5, features double the normal number of Sen-Alloy laminates (twelve in all) and 1,5 times thicker core wires. These are the features that afford the SA head its low impedance. It guarantees improved high-frequency performance since fewer addy currents are generated due to the finer laminates. Low-frequency distortion is reduced because of lower DC resistance.

 

Two-colour digital fluorescent level meters; Easy readability for optimum record levels.

Our fluorescent level meters are far more accurate and far more responsive than common mechanical VU meters.

 

Two-motor full-logic; Smooth operation with fingertip ease.

Like the finest decks available, the DD-5 has a two-motor transport that allows us to endow it with light-touch full-logic control so that function buttons may be operated in any order; there's no possibility of tape damage thanks to the logic system.

 

Lockable timer standby mechanism; for unattended recording

The DD-5 not only has a timer standby switch for unattended recording (or playing) but it also has an interlock that prevents the timer standby Rec mechanism from being switched an accidentally during power outage, to avoid inadvertent recording (or erasing)

 

Specifications

Frequency Response (At -20 VU)

Metal Tape :  30 - 16,000 Hz (±3 dB)

SA/Chrome Tape :  30 - 16,000 Hz (±3 dB)

Normal Tape :  30 - 15,000 Hz (±3 dB)

Signal-to-Noise Ratio :  60 dB (Metal Tape)

Wow and Flutter :  0,065% (DIN 45 500)

Crosstalk:  65 dB (1 kHz)

Channel Separation :  40 dB (1 kHz)

Total Harmonic Distortion

Total (0 VU, 1 kHz) :  1,0% (Metal Tape)

K3 (0 VU,  1k Hz) :  0,4 % (Metal Tape)

Heads:

Record/Playback :  Low-Impedance Sen-alloy Head

Erase :  Two-Gap Ferrite Head

Motors:

1 x Pulse Servo Motor

1 x DC Motor

Fast Forward/Rewind Time :  85 sec. C-60 cassette

Input Sensitivity/Impedance

Mic x 2 :  0,2 mV/600 - 10 k Ω

Line In x 2 :  80 mV. 100 k Ω

DIN :  0,1 mV/k Ω

Output Level/Impedance

Line Out x 2 :  0 - 500 mV/ 5 k Ω

DIN :  0 - 500 mV/ 5 k Ω

Headphones :  0 - 0,6 mW / 8 - 1 k Ω

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

Power Consumption:  26 watts

Dimensions (W x H x D):  420 x 110 x 290 mm

Weight:  6,0 kg

 

Leak 2001 turntable

Transcription Turntable

The new leak 2001 transcription turntable incorporates a unique spherodynamic method of isolating against external shock vibration and acoustic feedback. Small jolts which can damage an expensive record are eliminated.

The turntable itself is belt driven and its speed does not vary by more than 0,1% even when using a record cleaning device.

The synchronous 10 pole motor with a ferrite rotor ensures accuracy of speed even with changes in supply voltage and loading.

The precision engineered pick-up arm accommodates all cartridges with standard 127 mm mounting centres and has adjustable bias setting and adjustment for minimum tracking error with any cartridge.

 

Specifications

Turntable:

Speeds:  33-⅓ and 45 rpm

Speed Accuracy:  ±0,5%

Wow (Typical) :  0,08%

Flutter (Typical) :  0,02%

Rumble (Typical) :  -65db (DIN B)

Platter Diameter :  320 mm

Platter Weight :  1,6 kg

Suspension:  Unique spherodynamic system comprising; dynamically balanced turntable and pickup assembly; independently mounted on three highly flexible spheres, each containing special viscous damping fluid. Natural resonance frequency below 4 Hz

Motor :  10 pole synchronous, 600 rpm at 50 Hz

Transmission:  Belt drive to turntable rim. Precision ground belt.

Pickup Arm

Type :  Static balanced professional, precision engineered

Total Length :  323 mm

Effective Length:  240 mm

Dynamic Balancing:  By counter weight stylus pressure adjustable 0-3 grams, direct reading

Anti Skating:  By bias weight and thread adjustable for 0 to 3 grams stylus pressure.

Bearings:

Vertical :  Angular contact

Lateral :  two sets large size radial ball bearings

Bearing Pivot:

Friction : 18 mgm avarage, lateral and vertical

Leads : 1,2 meters, 4 wire and earth  DIN plug connection . Lead capacitance typical 108 pf per channel

Pickup Lift/Lower :  Remote controlled, viscous damped

Plug in Headshell:  Lightweight metal headshell suitable for all cartridges with international 12,7 mm fixings

Tracking Error:  With correct setting of stylus. 0°at inside diameter (2,375" radius) 1,5° at outside diameter (5,760" radius)

Tracking Angle:  Head offset 21°30'

Overhang:  Stylus tip from centre spindle 15 mm

Dimensions (W x H x D):  494 x 170 x 391 mm

Weight:  12,7 kg

Finish:  Teak

 

Leak 2000 receiver

The Leak 2000 Tuner-Amplifier has been manufactured to the highest specifications and includes the most comprehensive facilities.

Amplifier Section

The powerful 35 watts per channel amplifier is of advanced design, using modern technology power transistors and direct coupling to the loudspeakers. This provides exceptional power band width and damping factor down to the lowest audio frequencies. The wide band width design of the amplifier ensures minimum intermodulation distortion and very low harmonic distortion through the audio spectrum. Incorporated in the amplifier is special protection circuitry, this prevents damage to the bass speaker unit and prevents damage or fuse blowing within the amplifier in the event of a short circuit occurring.

 

Tuner Section

The tuner section incorporates numerous advanced technical features. The high quality front end, incorporating an FET provides high sensitivity with excellent stability. The IF circuitry is designed round a 14 pin integrated circuit using state of the art. Technology. The phase locked loop-stereo decoder provides high stability of stereo separation.

 

Special facilities for extending your hi-fi system

The 2000 Tuner-Amplifier includes special facilities for extending the uses of your hi-fi system.

Auxiliary input - this may be used for connecting an additional item of equipment, for example a television fitted with sound output facility.

Normal/Matrix Switch - when this switch is pressed, the speaker 2 connections are modified, allowing the loudspeakers connected to the speaker 2 sockets to operate as the rear-channels in a simulated 4-channel system. This provides a good simulation of concert hall reverberation effects

Preamplifier and Main Amplifier Normal/Separate switch - this allows flexibility in the use of the tuner-amplifier. With the switch in the Out (normal) position, it operates in its normal mode.

With the switch in the IN (separate) position, the preamplifier output is no longer connected to the main amplifier. A particular use of this facility is the interconnection with a rear channel amplifier, containing a matrix decoder (e.g. for SQ or QS systems), for the reproduction of quadraphonic sound (4-2-4 system).

The normal/matrix and the normal/separate switches give the option therefore of two types of 4-channel sound.

Variable level FM muting control - when the mute button is depressed, rotating the mute level control clockwise increases the minimum threshold level of signal the receiver will accept. Location of local transmissions is then made easier by the elimination of remote broadcasts.

 

Specifications

Output Power both channels sine wave driven at 1 kHz) :

40 +40 watts at 4 Ω  speakers

35 + 35 watts at 6 Ω  speakers

30 +30 watts at 8 Ω  speakers

Single Channel Mode : 80 watts

Total Harmonic Distortion :

All  power up to 30 watts, 1 kHz  ; 0,1%

At 1 watt, 1 kHz :  0,01%

At 30 watts, 10 kHz :  0,1%

Intermodulation Distortion (70 Hz and 5 kHz in ratio 4:1) :  0,1%

Power Bandwidth:  2 dB down relative to 35 watts : 10 Hz to 40 kHz (9,5% T.H.D. both channels driven)

Damping Factor:  40 (measured at 80 Hz)

Residual Hum and Noise (Volume control minimum):  1 mV max

Control Amplifier (-40 dB volume setting)

Treble Control:  ±13 dB at 15 kHz

Bass Control :  ±13 dB at 50 Hz
Main Amplifier Input:

Sensitivity :  830 mV (for 35 watts)

Input Resistance :  47 k Ω

Frequency Response (-2 dB) :  20 Hz - 50 kHz)

Hum and Noise : -90 dB

Crosstalk (at 10 kHz) :  - 50 dB

Disc Input

Sensitivity (at 1 kHz for 35 watts) :  2,2 mV or 6 mV

Input Resistance :  47 k Ω

Frequency Response:  Compensated to IEC 98 fine groove characteristic

Hum and Noise:  better than -65 dB

Input Overload Margin :  +35 dB

Crosstalk (at 10 kHz) :  -35 dB

Tape, Cassette, Aux Inputs

Sensitivity (for 35 watts):  140 mV

Input Resistance :  100 k Ω

Frequency Response :  25 Hz - 40 kHz (±1,5 dB)

Hum and Noise :  better than -800 dB

Crosstalk (at 10 kHz):  -40 dB

Alternative Aux Sensitivity:  550 mV

Tape Cassette Output

Output High :  140 mV

Output Low (DIN standard) :  1,4 mV / k Ω

FM Tuner

Frequency Range:  87,5 to 108 MHz

Sensitivity:  1,6 µV (30 dB signal/noise)

Mono Distortion (1 kHz) :  0,5%

Stereo Distortion (1 kHz) :  0,5%

Hum and Noise :  better than -65 dB (relative to 75 kHz deviation, 1 mV rf input)

Image Rejection :  -45 dB

IF Rejection:  _60 dB

Alternate Channel Rejection :  -50 dB

AM Rejection :  -50 dB

Capture Ratio :  1,5 dB

AFC Ratio :  2,5 to 1

Mute Level Range :  5 µV to 50 mV

De-emphasis :  50 micro-seconds

Frequency Response :  40 Hz - 14 kHz (±1,5 dB)

Pilot Sensitivity :  5 % modulation

SCA Rejection :  -70 dB

Channel Separation :  35 dB minimum (1 kHz); 30 dB (10 kHz)

Quasi Stereo Separation :  20 dB (1 kHz); 4 dB (10 kHz)

AM Tuner

Frequency Ranges

Long Wave :  150 to 350 kHz

Medium Wave :  510 to 1650 kHz

Sensitivity :  20 µV (20 dB signal/noise)

Image Rejection :  -40 dB

IF Rejection :  -40 dB  (at 1 MHz); -30 dB (at 220 kHz)

Selectivity :  25 dB

AF Bandwidth (-3 dB) :  3 Hz

Dimensions (W x H x D):  471 x 132 x 292 mm (18,8" x 5,3" x 11,7")

Weight:  9,7 kg (21,5 lb)