Small job on AU999, BIG job on AU-X1

Discussion in 'Exclusively Sansui' started by kevzep, Jul 29, 2016.

  1. Hipocrates

    Hipocrates Anti-Muppet Subscriber

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  2. kevzep

    kevzep Its all about the Music Subscriber

    Hahaha, yes well that's pretty much how it rolls sometimes........
     
  3. damacman

    damacman Blown and Injected Subscriber

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    Ahem. Don't make me have Gibson ban you from the Mc forum!!

    Carry on ...
     
  4. kevzep

    kevzep Its all about the Music Subscriber

    Well, best you go and tell on me then.....Because you know, I'm pretty much done over there....
     
  5. damacman

    damacman Blown and Injected Subscriber

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    That would be a loss not to have ya' brother!
     
  6. kevzep

    kevzep Its all about the Music Subscriber

    Well, actually I have to do a bit of work to my C33 and 2205, I was thinking of starting a thread, so it might not be over just yet, we'll see how it goes once I get started...
     
  7. Overundr1

    Overundr1 AK Subscriber Subscriber

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    The last ten comments brought to you courtesy of the itty bitty contact switch and toggle company who 40 years later are now known for their Deoxit products lol.
     
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  8. Harolda

    Harolda Active Member

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    Nice work there. Mine runs almost every day and it beats all other stuff I have. But I still have to compare it to my Yamaha B1 when that finally returns. Just like Hyperion I have to find time to finish it completely. I still have to put the restored phono boards in, but that means I have to unplug it .
    However it should get warm especially the phono boards which run in Class A. Did you already test the stability of the amp?
     
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  9. kevzep

    kevzep Its all about the Music Subscriber

    Well, after reading your restoration thread, mine is fairly lightweight compared to what you did......However, the unit it functioning well and I am very happy with the way it turned out.
    I was about to do some stability testing when I discovered the square wave function has stopped working on my generator.
    As soon as I have this resolved I will do some testing.
     
  10. restorer-john

    restorer-john Super Member

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    I noticed a Hitachi epoxy covered reed relay back several posts. I presume it's a headphone relay in this unit.

    IME, they are proving to be unreliable little buggers as time marches on. The green epoxy coating stuff eats into the copper windings around the two encased glass reeds. Much mid to late 80s Japanese gear had them inside. Just a heads up. :)
     
  11. Willy6

    Willy6 AK Subscriber Subscriber

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    What would be a good replacement for those green reed relays?
     
  12. restorer-john

    restorer-john Super Member

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    I've wound my own a few times (taped two reeds together and spun the pair in a drill chuck while winding copper wire from a 'donor' relay). You need a working one to measure first for resistance before you start however.

    You can get SPST 12v reed relays for cheap and run two in series to give you a 24v DPST relay. Often, those green blob relays are used where extremely low level signals are (in MC/MM switching etc) being switched and normal relays either have to much contact resistance, deteriorate, or add crosstalk.

    If the little buggers are just headphone relays, you can use pretty much anything and get away with it.

    IIRC, the L24 means it is a 24v relay- I'm not sure how many other voltages Hitachi made in those nasty little things. Lots of Hitachi cassette decks used them as tape monitor relays and Akai used them inside preamps/cassette decks etc. Marantz used them as headphone relays in the better gear in the 80s.
     
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  13. Hyperion

    Hyperion Roobarb & Custard Subscriber

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    Personally I would use one of the Omron G5V replacement types already used on the Phono mother board, you'd have to wire them up the same, and they wouldn't look great, but it would work. I have never seen replacement relays with the same package as the original green ones, but that doesn't mean they don't exist. :) (NB: also used in the AU-919 and probably others).
     
    Last edited: Jul 12, 2017
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  14. kevzep

    kevzep Its all about the Music Subscriber

    It is the headphone relay, just looked it up, yeah might not be a bad idea to replace that.
    You could pretty much use anything that will fit.
    I have a couple of little issues to attend to on the mother board that the Phono board plug into, I have to remove it, I think there is a cold solder joint or a crack in a track somewhere as we are having a few intermittent issues that relate to that board....
    Might as well see what I can do for a relay for the headphones while I am at it....
     
  15. AUD101

    AUD101 Parsley The Lion!

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    Check US Relay manufacturer Struthers-Dunn: RR2A-24VDC, MRR, RR Series - Axial Lead, Shielded Reed Relays
    Providing the spec's are able to emulate some of the Hitachi L24's quality's - this could be a possible(?) replacement - providing you are able to source them!

    Edit:
    Link to datasheet: RR/MRR Series
     
    Last edited: Jul 12, 2017
  16. Hyperion

    Hyperion Roobarb & Custard Subscriber

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    Wow - good find - providing "Universal Electronic Supply Co" (based in the US) will allow you to buy in singles (one's and two's) - they would work nicely I think. (Rhodium plated contacts :king: )

    Definitely need to get the MRR version (1" long) the RR version (1.54" long) is too big I think.
     
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  17. kevzep

    kevzep Its all about the Music Subscriber

    yeah same as what McIntosh use for all their input/output switching....in the newer models
     
  18. restorer-john

    restorer-john Super Member

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    Yes, very good find on the link posted above. :)

    One to bookmark..
     
  19. kevzep

    kevzep Its all about the Music Subscriber

    So in the middle of finishing up this job, I moved my Lab, so then once that was set up I could carry on with the X1.
    So I fired it up, and one channel had dropped out, and the protection circuit was playing up and acting the fool.
    It turned out to be just a couple of dry solder joints, but they evaded me for a while, and not before I had taken the back off to check speaker relay operation....took the front off again to access the board with the speaker selection switch on, then discovered the power switch had a faulty element.....
    I was chasing this nonsense around for a good 6 hours.....
    Anyway. I started the amp up this morning and ran it all day streaming a good radio station and it ran faultlessly, at times I had it cranked right up....
    So a couple of hours ago, I decided to put its pants on.....Its scrubbed up quite well...I am very pleased with it...

    Damn thing sounds insane!! I love it!!
    A few pics of the X1 tidy up in the new Lab.....I have some more test gear on the way, I am starting Tuner alignments, so I have a multiplex generator, sweep generator with markers arriving any time now, already got the RF generator...yes I am entering the voodoo world of tuners, I've always had an interest in tuners and I have extended my knowledge and I am going to put it to good use....
    IMG_4734.JPG IMG_4735.JPG IMG_4736.JPG IMG_4737.JPG IMG_4738.JPG IMG_4739.JPG IMG_4740.JPG
     
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  20. Hyperion

    Hyperion Roobarb & Custard Subscriber

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    There you go ;) a piece of cake for someone with your experience. It looks beautiful, nice and clean Kev, "scrubbed up well" :thumbsup:

    I am pleased you think so well of how it sounds, your opinion means a lot, mine adds a depth to the music like nothing else I have.

    And tuner alignment! - now you have yourself a tiger by the tail :D - but I am sure you will master it. :king:
     
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