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Nasty Marantz all-star

Discussion in 'Marantz Audio' started by cwh, May 28, 2017.

  1. thxdave

    thxdave Lava Lamp repairman

    Messages:
    408
    Location:
    Florida
    Mark at Blueglow Electronics had an interesting video on this subject this morning:
     

     

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  2. Steven Tate

    Steven Tate AK Subscriber Subscriber

    Messages:
    2,913
    Location:
    N. Richland Hills, TX
    Well, just my opinion having done this once. Low pressure dribble of rinse water after paint brush scrubbing with Windex will most liikely not harm your unit. Like I said, stay away from the meters and dial and the rest is not going to be hurt. You are going to replace the velum anyway and the transformer is painted and well sealed. Pressure wash? No way. Dribble rinse - not a problem. (All of this assumes solid state). The key is good hot drying. There is no way water molecules are going to stay in any component after a few days in a hot Texas summer garage. Cooler climes? Can't speak for that. But IMO, zero pressure water followed by compressed air removal of excess water and a few days of direct sun or hot garage heat will remove every water molecule. I did it a year ago to a 2245 before recapping and it sounds great today.
     
  3. cwh

    cwh AK Subscriber Subscriber

    Messages:
    715
    Location:
    Oakland, Ca.
    Geez for a second I thought I was being called out.

    To be clear no hoses nor pressure washers were used, not yet...

    Just a localized spritz, followed by some agitation, and finished up via removal through vacuum.
    IMG_2286.JPG
     
  4. cemerson

    cemerson AK Subscriber Subscriber

    Messages:
    115
    Location:
    Smithfield, VA
    Just a comment. I would just clean it as it comes apart to be recapped with alcohol and the vacuum. Anyone that has worked on these units, that is younger than these units has to realize, in the 70s and 80s a larger percentage of the population of America smoked. To find one that hasn't been around smoke would be more the exception than the rule. I bought a 2230 that had been in a bar for who knows how many years, and as you can imagine, was caked in nicotine, dirt, beer, and whatever and it smelled like smoke. You just have to get them apart and clean everything you can, but basically restore them. I don't think there's a short cut to making them smell like new.
     
  5. cwh

    cwh AK Subscriber Subscriber

    Messages:
    715
    Location:
    Oakland, Ca.
    I've heard amps that sound like sh*t but smelled? Double whammy
    If it comes to a full rebuild then I'll definitely be breaking the unit down and cleaning parts individually. I buy discarded gear from a recycler and there's always a level of filth that doesn't need to enter my workbench nor my living space.
     
  6. cwh

    cwh AK Subscriber Subscriber

    Messages:
    715
    Location:
    Oakland, Ca.
    Along those lines of repair/rebuild, this is my adult entry into the vintage Marantz club. Always game for virtual company if anyone wants to hang and assist.

    This project is to make amends for abandoning a nice one as a teenager in the early 90s. Can't remember the exact model. Probably 2270, wood cased and belonged to my step mom. I had it running with Dad's vintage KLHs. The unit stopped working so took it to repair shop and never retrieved it. I don't know why, stupid teenager, spooked by $100+ repair quote? Still carrying that weight of regret which also includes losing grandpa's Fisher tube integrated and large 60s furniture speakers.
     

     

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  7. Steven Tate

    Steven Tate AK Subscriber Subscriber

    Messages:
    2,913
    Location:
    N. Richland Hills, TX
    Don't feel bad. Nearly all of us have our audio equipment regrets. I bought a 2245 new in 1972 and a 5010 cassette deck in 1973. Both were mint when I moved in the early 90's and sold both in a garage sale for $100. The Home Theater age had begun, and I thought the stereo age had ended. Thank God I didn't sell my record collection, so when I came to my senses 20 years later, I just needed equipment to relive my youth.
     
  8. cwh

    cwh AK Subscriber Subscriber

    Messages:
    715
    Location:
    Oakland, Ca.
    The sun finally came out.
    IMG_2288.JPG
     
  9. raidermc

    raidermc It Is What It Is <> Subscriber

    Messages:
    239
    Location:
    Western New York
    MAP sensor cleaner from any Auto parts store works wonders:<)
     
  10. rustycat

    rustycat 70s gear freak

    Messages:
    984
    Location:
    High in the Custerdome
    Nature's Miracle is great on cat urine stink.
     
  11. cwh

    cwh AK Subscriber Subscriber

    Messages:
    715
    Location:
    Oakland, Ca.
    Specific cleaning or as general?

    MAPs and MAFs, different sensors but both use MAF cleaner right? MAF cleaner is pretty much naphtha.
     

     

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  12. cwh

    cwh AK Subscriber Subscriber

    Messages:
    715
    Location:
    Oakland, Ca.
    My little dude in the avitar got me using Bac-out enzyme cleaner for the occasional stomach issue on antique carpets. Works awesome. I thought about mixing it with a sudsing agent to keep it in place and spraying the Marantz.
     
  13. raidermc

    raidermc It Is What It Is <> Subscriber

    Messages:
    239
    Location:
    Western New York
    It is used for cleaning mass airflow sensor so as to not leave a residue.
    It is the MAF Cleaner
     
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  14. rBuckner

    rBuckner Luv 2 Restore Subscriber

    Messages:
    9,636
    Location:
    Prescott, Arizona
    Handsome pup there! I wouldn't use a pressure washer for sure, nor a dishwasher or anything that has pressure.
     
  15. cwh

    cwh AK Subscriber Subscriber

    Messages:
    715
    Location:
    Oakland, Ca.
    I decided to take some voltage readings and noticed the heat sink was putting off some warmth. Checked and adjusted for idle current and dc offset. Bias voltage was good but offset was high. Adjustment was a fail. I'll revisit when I'm a little more awake. Still got to track down that subtle distortion too.
     
  16. cwh

    cwh AK Subscriber Subscriber

    Messages:
    715
    Location:
    Oakland, Ca.
    Thanks, he's our boy!
     

     

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  17. cwh

    cwh AK Subscriber Subscriber

    Messages:
    715
    Location:
    Oakland, Ca.
    Hey gang, this previously fury urine drenched receiver is back and finally seeing some bench time.

    Shout out to @Steven Tate for his quick reply to my voltage adjustment/schematic error post. Yes ground to pin J722=35v.

    Main amp/PS and tone boards have been recapped and she’s sounding good with Gil Evens through the bench speakers. I’ll hit the phono next. The only 35mm +10k filter caps I had in my parts bin were Chemi-Con 15k. The inrush is more pronounced so a triac would be wise. Think I got some too.

    With all the electronics sorted I’ll get to dealing with the effects of the filth. Removal of minor frame rust and application of cold galvanizing coating where old has been stripped away. Final cleaning and reassembly.

    Looking forward to plugging it into to my Bozaks and experiencing the Marantz Sound.

    55992D63-42C8-420C-AEE6-4091F1918373.jpeg 0CB174BE-BA2B-47DE-BF00-E12B06AEF90D.jpeg
     
    Steven Tate likes this.
  18. cwh

    cwh AK Subscriber Subscriber

    Messages:
    715
    Location:
    Oakland, Ca.
    All tuned up and partially assembled. Couldn’t resist plugging it in.

    Wow! Sounds very capable playing through Bozak 302s. Feels much more muscular than 38 watts.

    7F6BFC96-0098-4390-953E-49233510C272.jpeg
     
  19. Steven Tate

    Steven Tate AK Subscriber Subscriber

    Messages:
    2,913
    Location:
    N. Richland Hills, TX
    I like it a lot. Hope you can find a balance knob. :thumbsup:
     
    cwh likes this.

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