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

    Messages:
    2,312
    Location:
    Des Moines, Ia
    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

    Messages:
    2,312
    Location:
    Des Moines, Ia
    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

    Messages:
    6,035
    Location:
    Montana
    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

    Messages:
    377
    Location:
    Florida
    Tom...."fish paper"?
     
  5. rBuckner

    rBuckner Luv 2 Restore Subscriber

    Messages:
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    Location:
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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

    Messages:
    6,035
    Location:
    Montana
    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

    Messages:
    377
    Location:
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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

    Messages:
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    Location:
    Prescott, Arizona
    If it isn't the same it is darned close!
     

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