Search this site

Labels

4-channel ACCUPHASE ACOUSTIC ENERGY ADC ADCOM ADS ADVENT AIFAI AIWA AKAI AKG Alchemist ALIANTE ALLISON ALTEC LANSING AMPEX amplifier AMPLIFON ANCIENT AUDIO AR ARCAM ARISTON ARMONIA AUDIA AUDIO ACADEMY AUDIO ANALOGUE AUDIO DYNAMICS AUDIO INNOVATIONS AUDIO NOTE AUDIO RESEARCH AUDIO-TECHNICA AUDIOLAB Audiostatic AUGUSTA AVALON AVID AXIOM B-I-C Bang & Olufsen BASF BASSOCONTINUO Bell Belt-Drive BEVERIDGE BEYER-DYNAMIC BOSE BOSTON BOWERS-WILKINS BOZAK BRAUN BRIONVEGA BSR California Audio Labs CAMBRIDGE CANTON cartridge CARVER CASTLE CD Player CD Transport CEC CELESTION CEMARK Centrex CERWIN-VEGA CHARIO CHARTWELL CIZEK CLARION CONRAD-JOHNSON COPLAND CORAL CORAL ELECTRONIC CREEK CROWN CYBERNET CYRUS DAC DAHLQUIST DALI DAT DBX DECIBEL DENON DIAPASON direct-drive Ditton DOKORDER DOMA DUAL DYNACO DYNAUDIO DYNAVECTOR EISA ELAC ELECTRO-VOICE EMPIRE EMT EPI EPICURE EPOS ES Series ESB Esotec ESOTERIC ESS EUMIG FAIRCHILD FOSTEX GALACTRON GALE GARRARD GENELEC GENESIS GIUSSANI RESEARCH GOLDENOTE GOODMANS GRAAF GRUNDIG H.H. SCOTT HAFLER HARBETH HARMAN/KARDON headphones HEATHKIT HECO HIRTEL HITACHI HPM idler INDIANA LINE INFINITY italian JAMO JANSZEN JBL JEFF ROWLAND JENSEN JMLAB JVC KEF KENWOOD KLH KLIPSCH KOSS KRELL KYOCERA LAE Lafayette lathe LEAK LECTOR LENCO LESA linear LINN loudspeaker LOWTHER LUXMAN LYNGDORF MAGNEPLANAR MARANTZ MARK LEVINSON MARTEL MARTINLOGAN MARUNI MASH MAXELL MBL McIntosh McLAREN MERIDIAN MERITON MICRO SEIKI MICRO-ACOUSTICS MIRAGE MISSION MITSUBISHI MONITOR AUDIO MONRIO MORDAUNT-SHORT MUSICAL FIDELITY MYRYAD NAD NAGRA NAKAMICHI NHT NIKKO NORESCO NOVA ONKYO OPERA OPTONICA ORTOFON PANASONIC PARADIGM PATHOS PEARL PHASE LINEAR PHILIPS PICKERING pioneer POLK AUDIO Power-amplifier Pre-amplifier Pre-phono Pro-Ject PSB QUAD quadraphonic RADFORD RCF receiver Reel to Reel REK-O-KUT REVOX ROGERS ROKSAN ROTEL ROYD RUARK SACD SAE sansui SANYO SENNHEISER SHARP SHERWOOD SHURE SIARE SIGNET SME SOMA SONAB SONUS FABER SONY SOTA Soundcraftsmen SPECTRAL Spica STANTON STAX Stereo 8 STILE ITALIANO STRUSS SUGDEN SUPERSCOPE Synthesis TAC TAD TAMON TANDBERG tangential TANNOY TASCAM TDK TDL TEAC TECHNICS THE FISHER THIEL THORENS tonearm TOSHIBA TRANSCRIPTOR TRIO tuner turntable ULIX Uni-Q UNISON RESEARCH unitra UREI UTAH VANDERSTEEN VOCE DIVINA VPI WADIA WHARFEDALE XAVIAN YAMAHA ZENITH ZINGALI

What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.




H.H. Scott '59





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")