Sansui AU-70 Operating Instructions & Service Manual Download Page 4 | Manualshive

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Summary of Contents for AU-70

Page 1: ...OPERATING INSTRUCTIONS SERVICE MANUAL STEREO CONTROL AMPLIFIER SANSUI AU 70 SANSUI ELECTRIC COMPANY LIMITED ...

Page 2: ...s fullest confidence This booklet explains the steps necessary for operating and caring for your new the AU 70 Read an the instructions carefully and retain for future use CONTENTS FEATURES 3 4 SPECIFICATIONS 5 CHARACTERISTICS 6 CONNECTIONS 7 8 9 10 SWITCHES AND CONTROLS 11 12 OPERATIONS 13 14 HINTS ON USE 15 16 SERVICE NOTE 17 18 PARTS LIST 19 20 21 SCHEMATIC DIAGRAM 22 PARTS LAyOUT 23 SUI STEREO...

Page 3: ...fidelity reproduction The amplifier has a much better SIN ratio and a gain three times larger than vacuum tube amplifiers EACH CHANNEL CAN BE OPERATED IN DEPENDENTLY EQUIPPED WITH TONE DEFEAT Each channel has independent tone controls for bass and treble This makes fine adjustment possible Moreover each channel is equipped with tone defeat which cancels the tone control circuits You can easily obt...

Page 4: ...EL METER FOR OUTPUT Three ra nges of 5 10 and 25W BLEND CONTROL VACUUM TUBES TRANSISTORS AND DIODES 7 189A X 4 6AN8 X 2 12AX7 X 3 OA 91 germanium diode X 2 25B 381 transistor X 4 50 1 B silicon diode X 2 5W 0503 silicon diode x l TOTAL 9 tubes a nd 9 diodes POWER SUPPLY 117V AC 50 and 60 Hz POWER CONSUMPTION 150VA DIMENSIONS W idth 15 6 Depth 1219 32 1 Height 519 3 WEIGHT 30 lbs 5 I CHARACTERISTIC...

Page 5: ...for the best musical repro 7 duction two or three way speaker systems which use different speakers for different frequency ranges In choosing the cabinet take account of tonal quality in addition to design CAUTION If you find that the sounds from both speakers do not mix well but leave a sort of vacuum midway between the speakers you can conclude that the amplifier and the speakers do not match in...

Page 6: ...th e l ase of monaural opera tion of the REC terminals on the back of your ampli fier ith shielded wires b Playback e CENTER Ii rI Q It o 16 eQ C CHANOllT Ii G fM TUNER B or C MPX ADAPTOR C 9 Conn ct the tape recorder output terminal LINE to Rand L R or L in the case of monaural operation of the TAPE MON terminals on the back of your amplifier 3 Playing tapes on the tape deck Connect the tape deck...

Page 7: ...ON to open the tone control circuits_ Then the frequency re sponse cur e of the amplifier will become perfectly flat 1 TAPE MONITOR vVhen you mak e record ings with a three head tape recorder turn this switch ON to use the am pIifier as a monitor Then the sounds recorded on the tape are re produced while you are recording Keep this switch ON when you play the tape on the tape recorder Be sure to k...

Page 8: ...ing purposes 4 Other adjusting knobs and switches can be used for the most satisfactory reproduction Remember that your AU 70 accepts only high impedance microphones You cannot get the best performance if you use too long micro phone cord which causes arious problems and reduces treble Your amplifier has separate tone controls for right and left speakers You will find this feature very useful when...

Page 9: ...ng When you use the amplifier for monaural reproduction it is easier for operation to use the upper R terminal for connection Be sure to set the MODE switch to the connected channel HUM AND HOWLING When you play a record or tape you may some times hear unpleasant humming or howling This does not mean that your amplifier is defective In most cases humming or howling is a result of these causes If y...

Page 10: ...jack 3 Defective record play er tape recorder or others connected to the unit 4 Defective coupling condenser 5 Discharged by pass condenser 17 Replace or repair S2 S20 S2e Szf S and S JO Replace or repair Replace Check C Cz C C6 C and Cs Check Cs C C9 and C O Symptom A Distorted sound on AUX B Distorted sound on PHONO and TAPE A Hum on AUX Probable Cause What to Do 1 Aged tube Check V V9 2 Short c...

Page 11: ...Carbon Fixed Resistor SMn YzWatt 10 Carbon Fixed Resistor SMn Yz Watt 10 Carbon Fixed Resistor 100Kn Enclosed in CRS02 100Kn Enclosed in CRS02 19 Part No Nomenclature RSI RS2 RS3 RS4 Rss RS6 RS7 RS8 RS9 R60 R61 R62 R63 R64 R6s R66 R67 R68 R69 R70 R7I R72 R73 R74 R7s R76 R77 R78 R79 R80 R81 R82 R83 R84 R8s R86 R87 R8B R89 R90 R91 R92 R93 R94 R9s R96 R97 R98 R99 Rloo ISKn Enclosed in CRS02 ISKn Encl...

Page 12: ...l F 30fl F 0 2f l F O 2p F O S p F O Sfl F 80pF 80pF 0 3fl F 0 3f l F O 3f l F 0 3p F 20f l F 20f l F 20f l F 20 I F SOWV 400WV 400WV 2S0WV 2S0WV 20WV 20WV 400WV 400WV Enclosed Enclose d Enclosed Enclosed Enclosed Enclose d 300WV 2S0WV 2S0WV 6WV 6WV 20WV 20WV 400WV 400WV 400WV 400WV 400WV 400WV Enclosed Enclosed Enclosed Enclosed Enclosed Enclosed 6WV 6WV 2S0WV 2S0WV 2S0WV 2S0WV SOOWV SOOWV 2S0WV ...

Page 13: ...O NITOR 55 a h I OFF TR 2 ON LOUDNESS S6 a d l 1 OFF 2 ON TONE OEFEAT S7 a d 1 OFF 2 ON LOW FILTER Ss a b 1 OFF 2 ON HIGH FILTER S a b I OFF 2 ON PRESENCE 5 0 a b 1 ON 2 OFF SPEAKER v 12AX7 S T a b 1 LEVEL lOW 2 LEVEL illDOLE 3 LEVEL HIGH 5 12 1 OFF 2 O N AC S u PILOTLAHP 1 2 3 4 OFF 5 ON Sl3b PlLf TLAMP 1 2 3 5 O FF 4 ON V fI 12AX7 S LEVEl ME R 1 2 3 4 OFF 5 ON S LEVELMETER 1 2 3 5 OFF 4 011 V SA...

Page 14: ...OFF 2 ON LOWF lTER S8 a b I OFF 2 ON HIGH FILTER S a b I OFF 2 ON PRESENCE S o a b I ON 2 OFF SPEAKER r 0 w I I 0 0 I 0 r v I2AX7 SI a b I LEVEL LOW 2 LEVEL HIODLE J LEVEL HIGH 5 I OFF 2 ON AC S Ja PIl OTLAHP 1 2 3 4 OFF 5 O N So PlLOTLAMP 1 2 3 5 O FF 4 ON 0 JX V II 1 2AX7 5 4 LEVEl fiIETER 1 2 3 4 OFF 5 O N S LEVEL METER 1 2 3 5 OFF 4 ON W J u UI9 9 u g f 0 w r u u 9 no r E J I millIl E 1rl no 0...

Page 15: ...I SANSUI ELECTRIC COMPANY LIMITED Head Office 14 1 2 chome Izumi Suginomi ku Tokyo Japan _ TEL _ 323 1111 Printed in Japan 01200M6 ...

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