Sansui AU-777A vs all contenders

Discussion in 'Exclusively Sansui' started by smurfer77, Nov 14, 2016.

  1. smurfer77

    smurfer77 AK Subscriber Subscriber

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    Great stuff! I love to see another AU-777A brought back into fine shape. One question: why do you have some caps on the underside of the main and preamp pcbs? Just ran out of space when changing over to film caps? Also I see you did the mod underneath with the remounted resistors to keep the heat under control :). It is worth the effort IMO.
     
  2. RS65

    RS65 New Member

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    Hi Tom,

    thats it. I have a Fine Arts A9009 new bought in the nineties with much more power, no noise and nearly no distortion - and - in comparisim to the old ones Sansui 3000, TR 707E, Harman Kardon 930, Kenwood KA 6000 no Sound. It`s just dead sounding. o.k., the old ones had to be rebuild but then they are really good.

    My TR707E sound on small Heco interiors 230s better as my FineArts A9009 with my T+A TMR160MK2. A friend of mine has tree Accuphases.,just forget it. And he has many many nice old ones. I think we compare AU777 against AU777a next time (both best rebuild). He also has AU555 and AU999. I don`t think one of thees is better.

    I mesured my AU-777a, and just biased it perfectly. 30w per Channel. Thats it.

    [​IMG]

    It was tricky to bias the protection circuit right, because of the changing of the Emitter-Resisors from the Power Transistors, this takes much time but i think i have done it. The first time the protection cuts off wasn`t fine.:idea:


    Hi David,

    thank you too.

    I have measured all components i take off from the 777a, with an LCR-bridge, Electrolytics from 20Hz to 200KHz. And if there were capacitors which have much more capacity in an old amplifier, and it works perfect i try to get near the same capacity when i put the new ones. So there were 3,3uF-Elnas which have 7,5uF, and so on. If there wasn`t enough space i took the other side of the pcb.

    There are just two elektrolytics which were dead (2uF instead of 1000uF). The rest was just working fine. But with the Silmics, Muses, Wimas, and other Nichicons and so on it was better...

    And Yes the power resistors from down side are really hot on the pcb, perfect tip from you and the bourns pots are really good too.

    Here is a nude from my TR707E

    [​IMG]

    It was my second restauration project after my Modell 3000. And with my experience from the last years i will make my (next) TR707A just a little better. My TR707A is now stock from 1965 and better sounding as the most new high end.

    Greets Rainer
     
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  3. smurfer77

    smurfer77 AK Subscriber Subscriber

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    Great. Looking forwards to seeing your future TR707A thread! :)
     
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  4. RS65

    RS65 New Member

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    o.k., but this will take a time.
    I hope it wasn`t to much off topic.
    I am very interessted in your former sound competition AU-777a vs. all contenders.
    Greets Rainer
     
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  5. levShtirlitz

    levShtirlitz New Member

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    Hi I just have picked up ka 6000 from thrift shop(45$WHYNOT) .when I was first testing it was pretty good but after checking all the switches amp stared to make allot of nose.Ihave made all recommended checks (http://audiokarma.org/forums/index....d-ka-6000-when-fix.98087/page-2#post-10859524 ) today I have tried it agin and from outside it seems like problem with power switch when I apply some pressure on it nose disappear (fined it when i was in between changing A/B/AB) I will keep looking for more info get proper tools and take look inside on next week .
     
  6. stereofun

    stereofun Super Member

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    LevShtirlitz, you might wanna address this in the dedicated Kenwood forum. I see the post ylu were referring was in the solid state forum. Cheers, Tom
     
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  7. Yellowyoda

    Yellowyoda New Member

     
  8. Yellowyoda

    Yellowyoda New Member

    Hello 'Sansuians',

    Well I've been a voyeur for long enough so I had best bite the bullet and become a bit more of a participant this post looks a good place to drop a line.
    AK is a great site and source of knowledge and experience in general but the 'Exclusively Sansui' one is especially dear to my heart.
    There is (as Stereofun eloquently phrased it) just something about the best of their amplifiers that gets you nearer to how live music sounds, a realness, if you will, certainly I feel that way about the models I have heard and use and that I don't quite get with some of the other brands I have tried
    -some come very close. I have a real soft spot for the The Kenwood KA6000.
    I am in no way an engineer though I can solder and have some small electrical experience, enough perhaps to get the bones of some of the technical threads posted and I have successfully carried out a couple of the minor mods I have seen and felt competent enough to try.
    I applaud any that have contributed to the various topics but Kevzep, Stereofun, Smurfer77, Blah Blah Blah and Hyperion a special thanks go your way.
    I hope to work on a couple of units I have at some point and hopefully I can pick your collective brains.
    The equipment is the route to musical enjoyment rather than collecting for the sake of collecting but I have to confess to amassing a tidy little number of amplifiers (speakers and CD players). Thanks to my understanding better half I have got to keep them, It helps that she is a music fan.

    So time to 'fess up - my collection:-
    Sansui; 2000 X, 3000A, 5000A, AU 7500, AU 11000, AU777 (my favourite, though the 3000a is quite sublime) and a AU999.
    Kenwood; KA6000
    SONY; TA1120, TA 1120A
    Yamaha; CA1010 (my girlfriend's favourite)

    All working and sounding very good but some in need of a look under the hood as most original and untouched.

    Cheers,

    Kato
     
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  9. smurfer77

    smurfer77 AK Subscriber Subscriber

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    Kato, I'm sure everyone appreciates your kind comments.

    I am interested in your opinions of 3000 vs 5000. I have never owned the 3000, but really like the 5000. In the brochure they list the 3000 below the 5000 but it's a bit cheeky with the 5000 power being rated at 4Ohms to make it seem more powerful than the 3000 (which they rated at 3000). I was always curious to compare the two.

    The CA1010 I'm sure is a fine unit; I love my CA1000, although not quite as much as my 777. The phono board and main amp adjustment setup on the CA1000 is really impressive.

    Oh and guess what, today marks the 5th anniversary of my joining AK :beerchug:. I still feel like the new guy on the block though! I remember 5 years ago I was pouring over recap threads piecing together which types of caps are chosen in different roles/scenarios before embarking on my AU-666 and AU-555A recaps. And the rest is history!!! Now seems a nice chance to thank all of the members who are sharing there hard earned findings and experiences with fellow enthusiasts. You know who you are - give yourself a pat on the back! I'm not as active on AK as I would like to be, but be sure this is my home away from home! You guys are really something special.
     
  10. stereofun

    stereofun Super Member

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    Hi Kato - welcome to the club. We all learn by engaging ourselves in the forum and sharing our projects and impressions. There are so many great people here whom I've learned from. Cheers, Tom

    ,.........

    Congrats Smurfer77 on your 5 years. I will never forget your 777a Christmas rebuild thread. We still need to drink some beers, listen to some good amps and go fly Erik the Red. ( In reverse order ofcourse)
     
  11. Yellowyoda

    Yellowyoda New Member

     
  12. Ronito6

    Ronito6 Super Member

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    [​IMG]

    Happy AK-versery!
     
  13. smurfer77

    smurfer77 AK Subscriber Subscriber

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    You do know how to get a laugh out of me! not the first time.
     
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  14. Ronito6

    Ronito6 Super Member

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  15. Yellowyoda

    Yellowyoda New Member


    Thanks for the welcome Smurfer77 and Sterofun, The forum does seem friendly and informative served up with a pinch of good humour.

    My impressions of the Sansui 3000A and the 5000A are probably not as well informed as they could be given they are both originall. So differences in performance could be down to relative wear and tear.
    My 3000A has the well known speaker protection factory mod work and I carried out the simple protection circuit mod( bad diode) that one of your techs kindly posted and have had no issues since, the protection light had been coming on occasionally after 5 hours plus listening sessions.
    Both units have some background noise in evidence (noisy transistors are the suspected culprit, I believe) but this doesn't detract much from the sheer musicality of The Sansuis. They both share similar house sound - wide soundstage, a warm sound with depth and weight not unlike seeing/hearing the artist playing live, terrific bass with great extension and a realness that is missing(to a lesser and greater degree) from much else I have used.
    Listening to Lennon's vocals on Twist and Shout from the Beatles first album was a revelation - I thought, Ah, this is what he sounds like.
    The 5000A has a bit more in the way of detail and perhaps a bit more drive but (as they stand) if anything the 3000A has a sound that is even more compelling
    In my humble opinion. It has a naturalness and openness that is quite beguiling, using speakers from that period probably helps.
    They work very well with the KLH 6's I have set up with them.
    Cheers.
     
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  16. smurfer77

    smurfer77 AK Subscriber Subscriber

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    Hi YellowYoda,

    Thanks for the impressions. Very interesting. I did expect the 3000 and 5000 might be rather similar. Both great machines. I expect I will rebuilt my 5000 and see what happens!

    I totally agree that this is a friendly and helpful place. And funny to mention that now because yesterday I added someone as a friend on facebook who was active with sansui on one of the groups there. As soon as I told them my AK handle they said they don't deal with anyone who is active on AK because it is the worst place on the internet and that most AK members have been kicked off of the group on facebook! Well, I politely said that this does not match with my experience, but I wished them a good day and unfriended them. Weird world! To be fair the guy was a pro tech and I guess some techs have a troubled relationship with AK, which I can understand.

    Am listening to the AU-70 now, with the Revox PR99 playing a 3 reel 2-track Falstaff! I do think the AU-70 is edging towards being my favourite unit! That said, we used a stock, but serviced/aligned 5000 at my friends wedding reception last weekend. Some people saw the amp before music started and said "That thing is just for show right", as my friend has a lot of vintage furniture from same era.... it made sense. Then the music came... and all smiles were dissolved into dropped jaws! The 5000 can dish out some party noise! I do wonder if my favour towards the 777A / 70, would be different if I redid all of my comparisons at higher power levels. I may have to make two tiers of favourites, one for lower power, say under 30W, and one for everything else at higher listening levels. But TBH I don't listen that loud so it hasn't been an issue before, but I really have doubts that the 777A could have done the job at my friends party.
     
  17. The Fuxtor

    The Fuxtor AK Subscriber Subscriber

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    Well on this topic.,, I have a 777a rebuilt following Smurfers rebuild and I do have to say it's been quite the awesome unit for sure! But that being said I still have a soft spot for my old au-555a for some reason, just really dig the overall sound of it( after a rebuild of course!) I have found myself with a nice 3000a receiver which I picked up in its original box awaiting a test run and eventual restoration and most likely an upgrade to the service bulletin . Anyone else have any advice or thoughts about the 3000a??? I'll hopefully start a rebuild thread on this one if anyone is interested?? I can always benefit from Sansui gurus.....:biggrin::D
     
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  18. smurfer77

    smurfer77 AK Subscriber Subscriber

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    I think the 3000 and 5000 are closer to the 777A than the 555A if that means anything to you. Definitely rebuild your 3000 though! I think the 3000/5000 might be higher on my list than the Eight Deluxe for now, but to be fair I have yet to hear a rebuilt 8D.... I must get onto that project!
     
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  19. RS65

    RS65 New Member

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    Hi Fuxtor,
    yes i am interested, please start an rebuild thread. The Modell 3000 is very near sounding to the au-777a. I have a totally recapped Sansui Modell 3000. It was my first experience in total recapping two yaers ago, but today with my experience from now i would make some things different. I have made some pics and maybe i open it and make some futher changes. I would help, if I can and i can post some nice nudes from it.
    There are a little bit differences between the first build model 3000 and the later ones. I have a later one with all the service changes from the sansui servive bulletin.
    Because of some problems with some original diodes in the power amp there may be a risk for the speakers, if there are no coupling caps at the output. I have 2x1000uF/35V Bipolar per channel (Nichicons).
    The 3000 is my personal No. 3 after the TR 707E and the AU-777a. i my ears It sounds better than my recapped following four:
    Kenwood TK140X (nearly the same amp as the KA6000), Sony TA3200F, Harman Kardon 930, or Marantz 2265B.
    Greets Rainer
     
    Last edited: Oct 14, 2017
  20. Ronito6

    Ronito6 Super Member

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    Shweet!
     
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