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)

 

Leak 3090 speakers

In Europe, home of some of the world's finest speakers, the Leak 2075 became recognised as a reference. Hardened professionals used this product as a yardstick by which other products were measured.

Enter the 3090 - the yardstick has grown.

The most dramatic improvement is the use of our patented Isodynamic tweeter. This is a flat-field unit, using no conventional coil, cone or dome. Instead, an ultra thin diaphragm with a printed circuit. This is activated by rows of miniature magnets made from Samarium Cobalt - the most powerful magnetic material known to man. The result - a response right up to 26 kHz -3 dB and possibly the best dispersion characteristics of any tweeter around.

 

The midrange is handled by two separate units. The upper midrange unit has holes in it. The precise positioning of these holes was worked out using laser-beam holography, so that delayed resonances are eliminated and this is one of the sweetest midrange units in existence. The lower midrange operates from 500 to 2000 Hz. About 40% of music power occurs in this band and the unit is built to take it - the cone is a sandwich of polystyrene and aluminium for great rigidity.

In the 3090, we have taken special care to make it right for any room, your room. Environmental Controls for Low Mid Range, High Mid Range and the ISO tweeter enable you to find the rigid tonal balance in the listening area and the swivelling upper cabinet means that these directionally sependant frequencies can be tuned to optimal dispersion for your favourite listening position.

Bass frequencies are handled by a 15" woofer,  made out of our unique sandwich of polystyrene and aluminium. The incredible rigidity of this unit means you get perfect piston-movement of the cone for real deep bass of the kind that only transmissionline cabinets can give you.

 

Specifications

Power Handling:  100 watts (DIN); 160 watts (DIN peak)

Frequency Response:  35 Hz -28,000 Hz ±3 dB

Impedance (Nominal):  6 Ω

Impedance Range: 

5 Ω  minimum from 70 Hz - 30 kHz

15 Ω  max. From 15 Hz - 70,000 Hz

Crossover Frequencies:  350 Hz, 2 kHz, 7 kHz

Drive Units:

LF : 1 x  Woofer 15"

MF :   1 x Mid-Range 7"

HF :  1 x 2" Tweeter and 1 x 1" Isodynamic Super Tweeter

Dimensions (H x W x D):  1190 x 500 x 375 mm (47" x 20" x 15")

Weight:  51 kg (112 lbs)

 

Leak Delta Turntable

It is important that the turntable in your high-fidelity system should be specifically designed to complement in performance and appearance the other components in your system. To this end we worked with one of Switzerland's foremost turntable specialists to create the Leak Turntable.

It is a dynamically balanced turntable which weighs over half a stone, eliminating the distortions that occur in lighter turntables due to internal vibrations.

The chromium plated pick-up arm is so sensitive that it can be affected by the infinitesimally centrifugal force it creates as it moves towards the centre of the record. We compensate for this with a bias compensator utilising a minute counterbalance supported on nylon thread. The turntable also has a viscously damped pick-up cueing device. In spite of this precision the Leak turntable is, like all the finest machines, simple to operate and maintain. The speed of the turntable is infinitely variable between 30 rpm and 86 rpm.

The very silent 4-pole motor is spring mounted onto a rigid steel baseplate. The power is transmitted from the conical motor shaft to the turntable by a ruber covered idler wheel. The speed is changed by moving the idler wheel on the motor shaft.

 

Specifications:

System:  Idler drive

Turntabel Type:  Dynamically balanced turntable. Viscously damped pick-up lowering device. Speed adjustment infinitely variable between 30 and 86 rpm.

Wow and Flutter:  0,06%, according to DIN Specifications

Rumble:  -60 dB, measured in according to DIN Specifications

Speed variations:  for a 10% change in mains voltage ±0,2%.

Maximum Speed Variation:  0,3%,  when loaded by a pick-up playimg at 6 grams

Motor:  4-pole constant valocity motor with conical rotor spindle

Pick-up Arm:  Arm with counter balanced weight.

Bearings:  Knife-edge bearings

Stylus Pressure:  adjustable from 0,5 to 5 grams with calibrated sliding weight

Minimum Stylus Pressure:  0,5 grams

Headshell:  Removable lightweight pick-up headsell

Cartrdige:  Shure magnetic M75B type 2

Stylus Overhang:  17 mm (0,675")

Stylus Position Adjustment:  13 mm (0,5")

Offset Angle:  23° 12'

Tracking Error:  ±0,8

Platter:  Die-cast zinc

Truntable Platter Weight:  4 kg (8,8 lb)

Power Requirements:  AC mains 200 - 240 V, 50 Hz

Power Consumption:  14 VA

Dimensions (W x H x D):  400 x 166 x 371 mm (16" x 6,6" x 14,8")

Weight:  8,5 kg (18,7 lbs)

Finish:  Teak

LEAK CDT multimedia player

For the first time in the history of LEAK, it is possible for the audio enthusiast to enjoy CD and digital media playback. The LEAK CDT offers the highest available standard of sound reproduction from CD playback within this price class. It is also equipped with USB storage device playback functionality. The LEAK CDT utilizes an ultra-smooth slot-loading mechanism that exudes quality and reliability.

The CD transport is carefully mounted within its own electromagnetically shielded enclosure and is provided with a dedicated power supply. The digital clock is controlled by a temperature-compensated crystal oscillator that makes sure the digital output from both the coaxial and optical sockets has minimum digital distortion, thus the digital signal extraction is exceptionally precise.

The USB storage device playback functionality offers full transport controls and folder / file navigation. The LEAK CDT is compatible with FAT16 and FAT32 formatted devices and will playback media in the format of WMA, MP3, WAV and AAC.

Carefully designed in line with the LEAK ethos of performance, reliability and craftsmanship, the LEAK CDT satisfies contemporary audio enthusiast demands with stand-out, classic LEAK styling.

One Step Ahead

The premium CD mechanism uses rad ahead bufering to reduce disc read errors and deliver the hig est level of digital signal extraction from CD media.

Accuracy for the benefit of the enthusiast

A temperature-compensated crystal oscilator controls the master clack. This enables the digital only output to provide incredibly low digital distortion 9also referred to as "jitter"). This low jitter output offers superior performance when copared to like-for-like players.

Excellence in isolation

The Leak CDT shields the CD mechanism from electrical interference, thus ensuring purity of signal. Such incremental benefits further enhance the performance for the audio enthusiast.

Disc or Disk? Either, or

The modern audio enthusiast will enjoy music in many formats due to the convenience and modern day quality of digital files. The Leak CDT facilitates your digital audio collection with digital file playback from USB storage devices. The Leak CDT  will play CD, CD-R,CD-RW disc as well as. WAV, MP3, WMA and AAC  (up to 48 kHz, 320 kps) digital audio files via USB.

A timeless Design

Matching the classic art.-deco inspired, traditional, Leak industrial design, the Leak CDT echoes a long-lost legacy in home audio , with stunning aesthetics.

Specifications

USB Memory Device Audio Format:  Supports WAV, MP3, AAC, WMA format

USB Memory Device File System:  Supports FAT12, FAT16 & FAT32 format

Output Level:  500  ±50mVpp

Output Impedance:  75 Ω

Frequency Response:  -0.01 dB (20 Hz - 20 kHz,ref. 1 kHz)

Sampling Frequency:  44.1 kHz (CD), 44.1k Hz,  48 KHz (USB memory device)

Digital Output Interface        :  1 x Coaxial ; 1 x Optical

Standby Power Consumption:  less than  0.5 W

Power Requirement:  220 - 240 V  ~ 50/60 Hz (Depending on your area) 100 - 120 V  ~ 50/60 Hz

Dimensions  (W x H x D): 

Silver model :  302 x 117.1 x 278 mm

Walnut model :  326 x 145.1 x 283 mm

Carton Size :  475 x 248 x 450 mm

Net Weight        

Silver Model :  5.3 kg

Walnut Model :  6.9 kg

Finish:  Silver/Walnut

LEAK Stereo 130 amplifier

The LEAK Stereo 130 is high performance, high-fidelity integrated amplifier for the modern-day audio enthusiast. It is designed to be the perfect match to a wide variety of sources and provides the necessary amplification to realise the highest quality oof your stored music through your loudspeakers and headphones or expanded high fidelity system, via the pre-amp functionality.

The LEAK Stereo 130 can be connected of both analogue and digital sources, thanks to its diversity of inputs. A built-in Moving Magnet (MM) phono pre-amplifier allows for direct connection to turntable record players.

To accommodate the modern-day music enthusiast fully, much effort has been made to ensure the LEAK Stereo 130 ’s digital circuitry delivers the level of quality one might expect of a high-performance standalone D/A converter, let alone an integrated amplifier solution

You can also stream music to the LEAK Stereo 130 from any Bluetooth device such as portable music players and smartphones via innovative built-in aptX and AAC codec. One can enjoy CD quality audio over the Bluetooth wireless connection.

Carefully designed in line with the LEAK ethos of performance, reliability and craftsmanship, the LEAK Stereo 130 matches contemporary performance with stand-out, classic LEAK styling.

Turntable Ready

Traditional audiophiles will recognise the assured quality in the high-quality, low-noise turntable input of the LEAK Stereo 130. optimised for Moving Magnet (MM) cartridges, the JFET-based circuit offers precise RIAA equalisation in accordance with de facto industry standards for vinyl record playback

Headphone Users

The LEAK Stereo 130 uses a dedicated amplifier circuit with current-feedback technology for the headphones output. Equal in performance to standalone headphone amplifiers, beyond the price-class of this complete system, the design offers high-speed output signal transition thanks to a high slew rate. The result is a dynamic, detailed and engaging performance with all manner of headphone types.

Conversion Without Compromise

Utilising the acclaimed ES9018 Sabre32 Reference chip with ESS Technology’s 32-bit HyperStream architecture and Time Domain Jitter Eliminator, the LEAK Stereo 130 offers ultra-low noise, high dynamic range of digital audio files with a sampling rate of up to 284kHz (PCM) and DSD256.

Direct and Tone Control

The LEAK Stereo 130 incorporates LEAK's signature Direct switch to bypass steps in the analogue circuitry, for the purest signal path. In addition, the signature Bass and Treble tone controls allow for customisation of the amplifier output signal to suit your music medium and mateched electronics or loudspeakers.

Specifications

D/A Converter:  ESS Sabre32 Reference ES9018K2M

Input Sampling Rates:  Optical, Coaxial: 44.1kHz~192kHz; USB: 44.1kHz~384kHz (PCM)/DSD64, DSD128, DSD256

Rated Output Power: 

2 x 45 W  at 8 Ω

2 x 65 W  at 4 Ω

Total Harmonic Distortion:  less than  0.005% (30 W, 8 Ω)

Frequency Response:  20 Hz-20 kHz (±0.5 dB)

Input Sensitivity        : 

 AUX IN (RCA) :  480 mV

Phono MM :   4.1 mV

Input Impedance: 

AUX :  10 K Ω

Phono MM :  47 K Ω //100 pF

Signal-to-Noise Ratio:  better than 108 dB (A-weighted, ref. 45 W)

Pre Output Level:  2,3 V (max.)

Pre Output Total Harmonic Distortion (THD):  less than  0.003%

Pre Output Signal-to-Noise:  better than 110 dB (A-weighted)

Bluetooth Version:  4.0        

Profile:  A2DP

Codec:  aptX (priority), SBC

USB Input:  1 x USB (B-type)

Digital Audio Inputs: 

2 x Optical TOSlink

1 x RCA COAX

Digital Audio Outputs: 

1 x Optical TOSlink

1 x RCA COAX

Analog Inputs        

2 x RCA (AUX1, AUX2)

1 x RCA (phono MM)

Analog Output        

1 x RCA (PRE OUT)

Power Requirement (Depends on your area):  220-240V ~ 50/60Hz 100-120V ~ 50/60Hz

Dimensions (W x H x D): 

Metal ;  302 x 118 x 270 mm

Wood :  326 x 146 x 276 mm

Net Weight:  7.02 kg (Silver) ;  8.30 kg (Walnut)

Finish:  Silver/Walnut

Leak Delta 30

 The Delta Amplifiers inherit some of the well accepted characteristics of previous Leak models, e.g. plug-in printed circuit boards. Uprating circuitry, heat sinking and fusing has led to significant performance improvements, particularly under high duty conditions.

There are four plug-in boards:

Two identical preamplifiers (left and right);

Two identical power amplifiers (left and right0

The power transistors, transformer and other power supply components are mounted on the chassis.

Due to the similarity of construction and circuitry between the Delta 30 and Delta 70, both units are incorporated any differences.

 Circuit description

Power Amplifier -  The output transistors and temperature compensation diodes are mounted on the heat sink, the remainder of the circuitry being located on the power amplifier P.C. boards. Power transistors are insulated electrically from the chassis by mica washers.

Quiescent current is measured by removing the appropriate HT fuse, and inserting a current meter. The current is adjusted by P5 and should be approximately 40 mA.

The amplifier D.C. output voltage (pin D on power amp board) should be +23 V with an HT supply of +48 V. This voltage is set by fixed circuit components, and significant deviation of this "midpoint" voltage indicates component failure,not necessarily an output transistor.

Full output for each channel is realised with 11 V RMS across an 8 ohm load.

Pre-Amplifiers

The P.C. contains tone control circuitry (excluding potentiometers) R1AA  equalisation for disc input, filter components, and appropriate amplification for all inputs.

With all inputs short circuit, volume control maximum, other controls level, noise output voltages should be less than the following: 7-5 mV on Tuner and Replay,  24 mV on other inputs

The sensitivities for each input to provide full output are indicated in the specifications (1 kHz sine wave). The corresponding output from the preamplifier,measured at the tape sockets is: phono socket output 400 mV approx. DIN output 40 mV approx.

Specification

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

20 + 20 watts into 4 Ω

15 + 15 watts into 8 Ω

10 + 10 watts into 15 Ω

Music Power Output (IHF):

60 watts into 4 Ω  loudspeakers,

40 watts into 8 Ω  loudspeakres,

24 watts into 15 Ω  loudspeakers.

Total Harmonic Distortion: 

0-1% at ALL power levels up to 10 watts at 1 kHz each channel into 8 Ω  loudspeakers.

Total Intermodulation Distortion: 

Input  - 70 Hz and 7 kHz in ratio of 4:1,

Less than 0-2% for ALL power levels up to 15 watts into 8 Ω loudspeakers

Less than 0-2% for ALL power levels up to 10 watts into 15 Ω loudspeakers

Overload Distortion:

Less than 0-1% for input signals up to 20 dB above stated sensitivity from 30 Hz to 15 kHz

Hum and Noise: 

63 dB below 30 watts into 8 ohm load on "Tuner" and "Replay"

53 dB below 30 watts on other inputs.

Cross Talk (between L  & R channels):   -50 dB up to 1kHz and -30 dB at 10 kHz.

Damping Factor:

20 measured at 1 kHz for 8 Ω loudspeakers

40 measured at 1 kHz for 15 Ω loudspeakers

Input Sensitivities (the sensitivities shown below give 30 watts output at 1 kHz into 8 Ω loudspeakers with tone controls "zeroed" and volume control on maximum): 

Disc 1 (RIAA Characteristic) :  2 mV at 1 kHz Input Impedance 47 k Ω

Disc 2 (RIAA Characteristic) :  10 mV or 30 mV  at 1 kHz Input Impedance 33 k Ω , 100 k Ω

Tuner 1 / Mic :  25  mV or 2 mV at 1 kHz / 47 k Ω 47 k Ω

Tuner 2 :  60 mV 250 mV / 50 k Ω 50 k ohm

(Selected by switched input attenuator marked "HI" and "LO" on rear panel).

Replay :   400 mV / 47 kohm

Frequency Response:  30 Hz to 20,000 Hz (±1 dB)

Tone Control Range:  50 Hz to 14,000 Hz (±16 dB)

Filter:  12 dB per octave roll off above 6 kHz

Dimensions:  344 x 119 x 254 mm (13,5" x 4,7" x 10")

Leak Point One Stereo

 Leak "Point One Stereo" (circa 1958)

Effectively a stereo version of the Varislope III, but with the Varislope circuit removed. Bass and treble circuit is the Baxandall circuit. Four EF86 valves are used - two for each channel.

  

The Point One Stereo pre-amplifier is designed specifically for use with the Stereo 20 or Stereo 50 power amplifiers, though it may also be used with any combination of two Leak monaural power amplifiers ( TL/12, TL/10, TL/12 PLUS, TL/25 PLUS,  TL/50 PLUS)

 "The Point One Stereo pre-amplifier is probably the most comprehensive unit in existence covering every refinement for stereo tape, disc and radio plus monaural amplification for any form of input signal … it is difficult to think of any additional requirement that one would ever wish. The equipment performs with the high performance always associated with the tradition of Leak equpment. It is a fine example of design and construction, and the pre-amplifiers can be used with any other leak main amplifiers. How the pre-amplifier can be sold for as little as £21 can be answered only by Harold Leak …  Summing up, therefore, one can highly recommend the Leak stereo system for use with any current monaural or stereo input whether it be from pickup, tape, radio or microphone."

Electrical Specifications:

Sensitivities/Input Impedance for 125 mV output :

Pickup (RIAA characteristics) :  3 – 5 mV/70 k – 100 kOhms

Tuner  :  35 mV/70 k – 100 kOhms

Extra  :  35 mV/70 k – 100 kOhms

Microphone  :  2 mV/120 kOhms

Tape Head (CCIR Characteristics) :   3 mV/120 kOhms

 Bass control :  ±14 dB at 50 c/s

Treble control :  ±14 dB at 20 kc/s

 Harmonic Distortion :  Less than 0,01% for 125 mV output.

Hum and Noise :  approx.  60 dB below full power output on tuner or extra and 52 dB below on other inputs.

LEAK Delta 70 (1972)

Circuit description

Power Amplifier - The output transistors and temperature compensation diodes are mounted on the heat sink, the remainder of the circuitry being located on the power amplifier P.C. boards. Power transistors are insulated electrically from the chassis by mica washers.

Quiescent current is measured by removing the appropriate HT fuse, and inserting a current meter. The current is adjusted by P% and should be approximately 40mA.

The amplifier D.C. output voltage (pin D on power amp board) should be +37 V with an HT supply of +75 V. This voltage is set by fixed circuit components, and significant deviation of this "midpoint" voltage indicates component failure,not necessarily an output transistor.

Full output for each channel is realised with 16 - 7 V RMS across an 8 ohm load.

Pre-Amplifiers

The P.C. contains tone control circuitry (excluding potentiometers) R1AA equalisation for disc input, filter components, and appropriate amplification for all inputs.

With all inputs short circuit, volume control maximum, other controls level, noise output voltages should be less than the following: 7-5 mV on Tuner and Replay, 22 mV on other inputs

The sensitivities for each input to provide full output are indicated in the specifications (1 kHz sine wave). The corresponding output from the preamplifier,measured at the tape sockets is: phono socket output 400 mV approx. DIN output 40 mV approx.

Specification

Rated Power Output:

40 + 40 watts into 4 ohms,

35 + 35 watts into 8 ohms,

28 + 28 watts into 15 ohms.

Music Power Output (IHF):

100 watts into 4 ohm loudspeakers,

90 watts into 8 ohm loudspeakres,

60 watts into 15 ohm loudspeakers.

Total Harmonic Distortion: 0-1% at ALL power levels up to 25 watts at 1 kHz each channel into 8 ohm loudspeakers.

Total Intermodulation Distortion: Input - 70 Hz anf 7 kHz in ratio of 4:1, Less than 0-5% for ALL power levels up to 35 watts into 8 ohms

Hum and Noise: 66 dB below 30 watts into 8 ohm load on Tuner and Replay and 56 dB below 30 watts on other inputs.

Cross Talk: between L and R channels, -50 dB up to 1kHz and -30 dB at 10 kHz.

Input Sensitivities:

Disc 1 (RIAA Characteristic) 2 mV at 1 kHz Input Impedance 47 kohm.

Disc 2 (RIAA Characteristic) 10 mV or 30 mV at 1 kHz Input Impedance 33 kohm, 100 kohm.

(Selected by switched input attenuator marked HI and LO on rear panel).

Damping Factor:

40 measured at 1 kHz for 15 ohm loudspeakers.

20 measured at 1 kHz for 8 ohm loudspeakers.

Tuner 1 Mic

25 mV or 2 mV

47 kohm, 47 kohm

Tuner 2:

60 mV or 250 mV

50 kohm, 50 kohm

(Selected by switched input attenuator marked HI and LO on rear panel).

Replay:

400 mV

47 kohm

Frequency Response: 30 Hz to 20,000 Hz (±1 dB)

Tone Control Range: 50 Hz to 14,000 Hz (±16 dB)

Filter: 12 dB per octave rolloff above 6 kHz

Dimensions: 344 x 118 x 238 mm

Photogallery