MR55A Thoughts

Discussion in 'McIntosh Audio' started by smartin53, Apr 13, 2018.

  1. smartin53

    smartin53 Active Member

    Messages:
    487
    Location:
    Denver
    So I got an MR55A for cheap and am in the process of restoring it. The thing must have sat in an attic or barn for years as it was in terrible condition visual wise. Definitely needs a recap also (one of the bumblebees is visibly split).

    Two things I was thinking though. The brass finish is badly pitted and corroded. I'm thinking it might be best to just sand it and give it a brushed look instead. The paint is not good either so I might just repaint that and carefully repaint the lettering too. Anyone done this before?

    Also, how tight is the tuning mechanism supposed to be? On newer stuff you can kind of spin the tuner, but this one there is a bit of resistance even though it moves freely.

    mr55 1.jpg
    mr55 2.jpg
     

     

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  2. smartin53

    smartin53 Active Member

    Messages:
    487
    Location:
    Denver
    OK so another question. I got the offending caps replaced (I haven't installed the new multicap just yet), installed missing tubes, and did a general cleanup. I turn the unit on and all tubes and bulbs seem to power up fine, but I get zero audio output. Not a single click or hiss from stations whatsoever so it definitely appears to be something with the audio output itself. Any simple things I can check right off the bat?
     
  3. rollcentre

    rollcentre Boom-tizzz

    Messages:
    526
    Location:
    DFW,TX, United States
    I've got an MR55, and I haven't had the opportunity to play around with it yet, test the tubes, recap, replace selenium etc., mine somewhat works, but I haven't powered it up since the previous owner demoed it to me. for the tuning knob, mine takes a very slight amount more effort to turn, compared to my mr78, but it really does turn quite easy compared to my '58 RCA 8-rf-13, has a better overall feel and way less backlash.

    IMG_20180317_225039.jpg
     
  4. clinic-audio

    clinic-audio all on YAMAHA untill 1990

    Messages:
    1,971
    Location:
    France
    Hello smartin53

    I think that you didnot realize how much this task is complicate and is a very long process . A unit in this shape can't work . Don't forget also that this kind of unit is not only a chassis with empty tubes sockets , but there is also mica capacitors inside each IF transformers and they need to be refixed and at the end realignement of this tuner is necessary ....

    I know about I am talking about because I am doing this for a customer who asked me to make his MR71 like brand new , I already spend over 6 month and it is not finished ....Very , very long process
     
    rollcentre likes this.

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