User manual MCINTOSH MR 74

[. . . ] . MR71 FM STEREO TUNER INTRODUCTION n T h e M c l n t o s h R7 1 i s a p r e c i s i o e n g i M n e e r e dh i g h l y e n s i t i v e M M u l t i p l e T u n e r . , s F x The research staff of Mclntosh Laboratory h a sd e v e l o p efdv en e wt u n e rc i r c u i t m p r o v e i i f m e n t s o r t h e M R7 1 . A u t o m a t i c t e r e o - m o n s w i t c h i n gh a t s o t i s " c l i c k l e s s "a n d c o m p l e t e l ye l e c t r o n i c . M u l t i p a t h n d i c a t o ro e l i m i n a t e u l t i m i t p a t h r e c e p t i o n y s h o w i n g h e ny o u ra n t e n b w na is rotated the correctposition minito for mum multipath istortion. [. . . ] distortion due to multipathrecepReduce tion. and the acculmprovestereoseparation INDICATOR reducing by racyof yourSTEREO multipathreception. N R T h eM R7 1 M U L T I P A TIH D I C A T Os h o w s distortionfrom multipathsignal reception. on reception causes two beams the Multipath r . t h e i n d i c a t otro f l u c t u a t e a p i d l yW h e nt h e antenna is rotatedto the correct position, . t h e i n d i c a t o b e a m sw i l l r e m a i ns t e a d yT h e r 6 "-t \ le d i r e c t i o n aa n t e n n ai s p i c k i n gu p o n l y t h e l desired signal and rejectingthe reflected I m u l t i p a t hs i g n a l s . n s o m e l o c a t i o n si, t i s possible will that the bestreception occuron a strong reflectedsignal rather than the d i r e c ts i g n a l W h e ny o u t u n e t o a d i f f e r e n t . i r s t a t i o n t h e m u l t i p a t h n d i c a t ow i l l t e l l y o u , i f m u l t i p a t hi s p r e s e n t . M u l t i p a t hi s i n d e p e n d e no f s i g n as t r e n g t h . t l STEREO INDICATOR will The stereoindicator lightwhenthe dial pointercrosses stationbroadcasting multia plexstereo. circuitusedwilllight The special c O N L Yo n t h e 1 9 K C m u l t i p l e x a r r i e r . T h e i n d i c a t o r i l l n o t l i g h t o n n o i s e p u l s e so r w interference. T U N I N GI N D I C A T O R tuned when the An FM stationis correctly i n d i c a t o i s i n t h e b l a c ka r e a o f t h e t u n i n g r o i n d i c a t o r . h ea c t i o n f t h e T UNI N Gi n d i c a t o r T is independent stationsignalstrength. , n r o r * o r o * o r o * , F * r , n n n o " r o n ilADI IN USA TP2 f T e s tp o i n tT P 2 i s p r o v i d e do r t u n e rc i r c u i t n t a l i g n m e n tl . i s a l s ou s e di n c o n j u n c t i ow i t h M theMclntosh l 2 or Ml 3. ADJ OUTPUT c T h i s d u a l c o n c e n t r i c o n t r o la d j u s t st h e p a v o l u m el e v e l s t t h e l e f t - h a n d a i ro f output c e n t e rs h a f t T J A U D I OO U T P U T A C K S . h e a d j u s t st h e L E F Tc h a n n e lo u t p u t , a n d t h e c l a t o u t e r s l e e v e d j u s t sh e R I G H T h a n n eo u t for put. Theseoutputcontrolsettings the left b p a i r o f j a c k sa r e n o t a f f e c t e d y t h e M R7 1 c f r o n t p a n e lv o l u m e o n t r o l . A MUTING DJ o g Adjust heoperatinthreshold f the ultras o n i cm u t i n gc i r c u i t . AUDIOOUTPUT-LEFT. RIGHT ja p O T h el e f t - h a n d a i ro f A U D I O U T P U T c k s p r o v i d e sa u d i o s i g n a l su n a f f e c t e d y t h e b co l. M R 7 1 f r o n tp a n e l V O L U M E n t r o T h ed u a l c A c o n c e n t r iO U T P U T D J U S T o n t r o l s e tt h e c t l . v o l u m e e v e l sU s et h e s eo u t p u tj a c k s o c o n t o a s t e r e oc o n t r o lp r e a m p l i n e c tt h e t u n e r v c f i e rw h i c hh a si t so w nm a s t e r o l u m e o n t r o l . T h e r i g h t h a n d p a i r o f A U D I OO U T P U T j a c k sp r o v i d e a u d i os i g n a c o n t r o l l e b y t h e s d l c M R 7 1 f r o n t p a n e l V O L U M E o n t r o l . U s e t h e s e o u t p u t j a c k s t o c o n n e c tt o e x t e r n a l p o w e r a mp l i f e r , t ap e r e c o r d e r s , r a n y o i requires ontinuoufront c s e q u i p m e nw h i c h t p a n e lc o n t r o o f t u n e ro u t p u tv o l u m e . l 3 O OO H M - 7 5 O H M A N T E N N A F t f Terminal or connecting M antennaso t h e M R7 1 . 1A SLO BLO FUSE " t A 1 a m p " S l o - B l o f u s e p r o t e c t sh e t u n e r t c i r c u i t sT h i sf u s ed o e sn o t p r o t e ca d d i t i o n a l . [. . . ] Rotatethe directional antennafor best as shown by the signalstrength reception a n d m u l t i p a t hn d i c a t o r s . Adjust the VOLUME controlto desired listening level. 11 ADJUSTMENTS MUTINGTHRESHOLD MUTING ADJ illj:i tt , i il; o n t h e t u n e r b a c k p a n e l . S e t t h e s w i t c h to B R I G H T o r m a x i m u mp a n e ll i g h t . S e t f the switch DIMfor lessdiallightand extended to l a m pl i f e . [. . . ]