Marantz 2285 Restore

Discussion in 'Marantz Audio' started by rhodus, Mar 22, 2018.

  1. rhodus

    rhodus AK Subscriber Subscriber

    Messages:
    234
    Location:
    Denham Springs, Louisiana
    Just started this project. I got this 2285 from the original owner and I am the first to service it. It actually sounded ok at lower volume but definitely in need of cleaning and service. I started on the pre amp board PE01 because I had purchased some Sparkos Labs BA312 upgrade op amps built specifically for Analog Esoteric. I wanted to get this board and those new op amps just right before moving on to the rest of the unit.
     

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  2. rhodus

    rhodus AK Subscriber Subscriber

    Messages:
    234
    Location:
    Denham Springs, Louisiana
    The op amps are a must have. They are a profound improvement in sound quality without losing that "Marantz" soul. I will be starting the power supply and amp boards this weekend and will post more pics then. In the meantime, forgive for posting a couple pics of my wonderful SX5590 IMG_20180320_140610540.gif IMG_20180311_205741410.gif
     
  3. Jailtime

    Jailtime Standin' on a corner Subscriber

    Messages:
    11,371
    Location:
    Velva ND
    I'd sure like to hear what the op-amps are all about. I have a 2275 on the way, I think they can be used in it. Nice work on the preamp board, lots of nasty little tantalums scattered on there. Working on receivers like the 2285 is a pleasure with the modular boards, Marantz really got that beast right.

    Beautiful SX-5590, you can show that off any time. :thumbsup:
     
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  4. rhodus

    rhodus AK Subscriber Subscriber

    Messages:
    234
    Location:
    Denham Springs, Louisiana
    They sell for $75/pair and I say well worth it. Easy to install. I'm pretty sure they will work on a 2275 or any receiver that uses the old BA312s
     
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  5. Fairlane

    Fairlane AK Subscriber Subscriber

    Messages:
    1,647
    Location:
    West San Jose CA
    The 2285 is a great receiver and a breeze to work on compared to the earlier receivers.
     
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  6. wurlyman

    wurlyman Active Member

    Messages:
    236
    Location:
    Sacramento, CA
    I just got my Op Amps, haven't put them in yet. Can't wait to hear the improvement that everyone says I'm going to experience.
     

     

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  7. tarior

    tarior Dirty pool, old man? Subscriber

    Messages:
    6,457
    Location:
    Kelso, Washington
    BA312 isn't an opamp. It's just a transistor array. There is no sense at all in replacing them if they are working.
     
  8. raidermc

    raidermc It Is What It Is <> Subscriber

    Messages:
    244
    Location:
    Western New York
    Found it:<) Thanxs
     
  9. Osibisa

    Osibisa AK Subscriber Subscriber

    Messages:
    266
    Location:
    New Jersey
    Please keep us posted. I'm still trying to determine why this mod is needed/recommended.
    Thx
     
  10. wlhd1610

    wlhd1610 Penny and her new friend Subscriber

    Messages:
    2,268
    Location:
    upstate new york
    Noah's (HalloFi) Analog Esoteric site claims that these replace the old, inferior BA 312 chips in vintage Marantz units that are no longer available.

    I have asked several other well respected long time Marantz techs here on Audiokarma, who have restored hundreds of Marantz units ,how many BA312's they have had to renew over the years and the collective answer ,including myself, was 2 .
    And if you do need a BA312 they are readily available.

    As far as "greatly improved sound quality/specs" goes , I would really like to see some actual before and after performance test results comparing strictly the difference between the original BA 312 and this new mod before ANY other work is done on the unit.

    In other words , no fair comparing the test results of a bone stock 40 year old 2275 against a fully restored 2275
    that has had this new mod installed because I can tell you that answer right now!

    Detailed before/after test results by a disinterested third party with no skin in the game are needed here.

    Carry on......

    Bob
     
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  11. rhodus

    rhodus AK Subscriber Subscriber

    Messages:
    234
    Location:
    Denham Springs, Louisiana
    Somebody needs to do just that. At the moment this is just a hobby for me. Other than a Fluke multimeter and a dim-bulb-tester, my main test equipment is my hearing. Just so you know, I waded into the snakepit of Noah haters by accident. I don't know the man. I just saw his module on the bay and it sounded cool so I bought one since I recently started repairing a 2285 for a friend. Ever since I mentioned this in another 2285 thread I have read all kinds of horror stories about the guy. He's even banned from AK. That said, my 2285 is and was working. Power supply 35v and steady, idle both amps 20mv and steady, dc offset 2-6mv and reasonably steady. When I installed the module there was a noticeably pleasant improvement in the sound. I'm not gonna waste time about soundstage and blah blah blah, I'm telling you it sounds better. After reading all the bad about Noah Schumer, I ordered another set this morning in case he goes to jail.
     

     

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  12. tarior

    tarior Dirty pool, old man? Subscriber

    Messages:
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    Tom (Catrafter) has already done it and found no measurable performance improvement.
    http://audiokarma.org/forums/index....-to-op-amp-modification.784499/#post-10797774

    And here's your warning about Hallo-Fi.

    http://audiokarma.org/forums/index.php?threads/hallo-fi-electronics.711282/
     
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  13. rhodus

    rhodus AK Subscriber Subscriber

    Messages:
    234
    Location:
    Denham Springs, Louisiana
    I'm sorry, I couldn't find Tom's test results. I would like to see that. I've already seen what you posted about Noah. I really don't want to get in the middle of it. I can only say that I would never send vintage equipment off to be repaired without written assurances and even then, I would never pay in advance. I tell my friends that if they are not happy with my work I will buy their unit from them. No takers yet. Just finished a 1250 1 month ago and now his dad wants one.
     
  14. wlhd1610

    wlhd1610 Penny and her new friend Subscriber

    Messages:
    2,268
    Location:
    upstate new york
    My apologies if I sounded too harsh as that wasn't my intent at all, I just get PM's all the time about the carnage that **** left behind.

    The 2285 is a great unit and you're doing a fine job!

    I'll send you a PM.


    Bob
     
  15. rhodus

    rhodus AK Subscriber Subscriber

    Messages:
    234
    Location:
    Denham Springs, Louisiana
    I understand and if all that is said is true, he should be in jail. I'm thinking theft by conversion and mail fraud just for starters.
     
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  16. catrafter

    catrafter Marantz Specialist Subscriber

    Messages:
    6,063
    Location:
    Montana
    I'm not opposed to finding the best solution to a problem, I am opposed to creating a problem and supplying a solution.
    Of the many Marantz models I have restored that use the BA312, I think I have replaced one or two BA312's that were bad and would not pass the signal.
    I have never seen one that caused high distortion or excessive noise.

    Tom
     
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  17. tarior

    tarior Dirty pool, old man? Subscriber

    Messages:
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    Location:
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    Dude belongs in jail, but hey, let's buy his snake oil parts!:cool:
     
  18. rhodus

    rhodus AK Subscriber Subscriber

    Messages:
    234
    Location:
    Denham Springs, Louisiana
    He's gonna need bail money!
     
  19. rhodus

    rhodus AK Subscriber Subscriber

    Messages:
    234
    Location:
    Denham Springs, Louisiana
    I think this thread is ruined. My apologies and I promise I will never mention Noah or AnalogEsoteric again.....
     
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  20. tarior

    tarior Dirty pool, old man? Subscriber

    Messages:
    6,457
    Location:
    Kelso, Washington
    I'm sorry for being a party pooper. But it's a completely unnecessary modification that is being peddled by someone with a reputation for less than honest dealings.
    We have a hard enough time keeping neophytes from making their receivers and amps into doorstops around here, without having to deal with yet another solution in search of a problem.
     

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