2270 - Serial 11426 - Refurb, mostly caps and diodes, a few transistors

Discussion in 'Marantz Audio' started by Dingman, Feb 17, 2018.

  1. Dingman

    Dingman Do you know where your towel is? Subscriber

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    OK, lets get this one wrapped up. Raining again today, so it would be nice to get it closed.

    Question:
    Looks like I should go thru at least the simple phono-amp adjustment, since on I replaced all the transistors, diodes and most caps - but I rarely listen to vinyl.

    Also, since I haven't touched the tuner at all (seems to work fine, but no tests done) - anything I should get here before putting the cover back on?

    Also, I still need to do another "load" test like in the beginning - wouldn't that be a bummer if results weren't as good as I started with, LOL>
    A freq sweep and then square wave test - I'll keep ya updated! Whoop!

    EDIT:
    I did find a busted connection on that shielded tube for the left amp. IMO, ALL these ground connections that are soldered look like crap. I re-flowed a few.
    Marantz 2270_L-Amp_05.jpg
     

     

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  2. Dingman

    Dingman Do you know where your towel is? Subscriber

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    And a few other pics of the left amp. Jeesh, I used a ton of wick getting those huge globs of solder off the board. LOL, so I put huge globs back on, to maintain the look. Har.
    Marantz 2270_L-Amp_04.jpg
    Marantz 2270_L-Amp_02.jpg
    Marantz 2270_L-Amp_03.jpg
     
  3. catrafter

    catrafter Marantz Specialist Subscriber

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    Your #1 picture shows where the end of the spring is 'soldered' to the metal chassis. Since traditional electronics solder will not bond to spring steel, the solder just acts like glue to hold the spring end in place.
    The tricky part it to get the whole mess hot enough to stick the spring end to the chassis without melting the wiring.
    I use hemostats as a heat sink and fish paper as a bushing so the wires don't get melted.

    Tom
     
  4. thxdave

    thxdave Lava Lamp repairman Subscriber

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    Tom...."fish paper"?
     
  5. rBuckner

    rBuckner Luv 2 Restore Subscriber

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    It's a thick paper made for electrical insulation purposes. I'm not sure who would have it these days. Maybe McMaster Carr supplies or an antique radio supplier?
     
  6. catrafter

    catrafter Marantz Specialist Subscriber

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    GC electronics still makes it, no fish had to die.
    You can get it at most electronics online retailers, GC 560
    Tom
     

     

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  7. thxdave

    thxdave Lava Lamp repairman Subscriber

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    Is that the same material that sits under the tone board of my 2275? I think I've seen this tacked under the phono boards, too.
     
  8. rBuckner

    rBuckner Luv 2 Restore Subscriber

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    If it isn't the same it is darned close!
     
  9. Dingman

    Dingman Do you know where your towel is? Subscriber

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    I like to use black paste wax on the alum front. Seems to work OK, very slightly abrasive I think but I've never seen an issue with lettering.
    I'm close to buttoning this up, it's been playing for 6 weeks or so - I suppose I'll check DC and bias one more time, but there it is.
    IMG_20180610_165922210.jpg
     

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  10. Steven Tate

    Steven Tate AK Subscriber Subscriber

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    I also use a very slightly abrasive auto polish on faceplates and knobs. It cleans the grime out and I’ve never had a problem with it removing lettering. But I do use common sense and don’t overdo it over the lettering.
     
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  11. Dingman

    Dingman Do you know where your towel is? Subscriber

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    Agree on the use common sense. I don't overdo it and it really seems to eliminate all the smudges, marks and just generally evens it all out. No dull spots.
     

     

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