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Leak Delta 75 receiver The Leak Delta 75 receiver was launched in 1971, with long, medium and FM bands. The amplifier delivers 35 watts per channel with a distortion level below 0.07% with the facilities for disc and tape. The retail price in 1972 was £165.00.
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Amplifier General specification |
Amplifier Disc Input specification |
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Rated output power (both channels sine wave driven at 1 kHz): |
Replay characteristic: within ±1.0db of I.E.C. 98 fine groove characteristic |
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Into 8 ohm load: 35+35 watts |
Sensitivity: (for 35 watts into 8 ohm load at 1 kHz) |
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Into 4 ohm load: 40+40 watts |
Magnetic:25 mV Ceramic: 20 mV |
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Into15 ohm load: 25+25 watts |
Input Resistance: Magnetic: 47K ohms Ceramic: 33K ohms |
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Harmonic Distortion |
Hum and Noise: (0db=35 watts into 8 ohms): -65db |
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(at all levels up to rated output power, 1 kHz applied at any input) |
Weighted Noise: (0 db=35 watts into 8 ohms): -75db |
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Into 8 ohm load: 007% max. |
Input Voltage Overload Range:28db |
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Into 4 ohm load: 014% max. |
Amplifier Tape Input specification |
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Into 15 ohm load: 005% max. |
Sansitivity (for 35 watts into 8 ohms):300 mV |
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Music power (IHF):100 watts into 8 ohms |
Input Resistance: 150 K ohms |
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Frequency Response: (—3db): 125 Hz to 50 kHz |
Hum and Noise: (0db= 35 watts): —75db |
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Damping factor: 30 minimum into 8 ohms |
Weighted Noise: (0db-=35watts):—l0db |
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Stability: BS 3860) Unconditional |
AmplifIer Auxiliary Input specification |
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Tone Control Range: 114db at 50 Hz and 15kHz |
Sensitivity: (for 35 watts into 8 ohms):100 mV |
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Balance Range: 12db |
Input Resistance: 50K ohms |
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Filter: 6db at 7kHz Residual hum and noise (volume control minimum, 0db=35watts): - 80db |
Hum and Noise: (0db=35 watts): -80db |
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Amplifier Tape Output specification |
Weighted Noise: (0db=35 watts): -85db |
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Phonosocket. Nominally 100 mV average level from low impedance |
FM Tuner specifications |
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DlNsocket. Nominally 100 mV average level from 100 K ohms |
Tuning Frequency Range: 87-108 MHz |
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A.M. Tuner MediumWave |
Sensitivity (l.H.F.):22uV into 75 ohms input |
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Harmonic Distortion: less than 0.5% |
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Frequency Range: 510-1650 kHz |
Selectivity (Alternate channel):40 db (I.H.F.) |
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Sensitivity:25 uV (l.H.F. 1 MHz) |
Capture Ratio (l.H.F.) :35db |
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Adjacent Channel Selectivity: 20db (l.H.F.) |
IF. Rejection Ratio: 80db min |
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Image Rejection Ratio: 45db mm |
Image Rejection Ratio: 70db min |
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AM Suppression (l.H.F.): 50db min |
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AM. Tuner Long Wave |
Stereo Separation: 35db at l kHz |
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AFC Ratio: 4:1 (switched) |
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Frequency Range: 150—275 kHz |
Frequency Response: 40Hz tc 15 kHz |
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Sensitivity (200 kHz):50 uV |
Inputs: 75 ohms unbalanced. 300 ohms balanced |
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Contents |
Introduction 1/2 |
Introduction /2 |
Power Supplies 2/3 |
Power Supplies /3 |
General Circuit Diagram /3/a |
General Circuit Diagram /3/b |
Main Amplifier 3 |
Main Amplifier 4 |
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Tone Control Amplifier 4 |
Preamplifier 5 |
Note |
F.M. Tuner (Front End) 5 |
F.M. I.F. Strip 6 |
F.M. I.F. Strip 7 A |
F.M. I.F. Strip 7 B |
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