Marantz 2275 Restoration - 1974

Discussion in 'Audio Visual' started by aokman, Oct 25, 2009.

  1. goodguy82

    goodguy82 Member

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    Keep up the good work mate :thumbup:

    can you put up a youporn clip for us??
     
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    aokman

    aokman Member

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    yup movies to come :) just got the get the front back together then i can hook it up to the floor standers :)
     
  3. itachi46

    itachi46 Member

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    isnt idle current alittle high? its suppose to be 10mvdc (25mA) according to my lil book here >.<
     
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    aokman

    aokman Member

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    yeah sorry i shoulda mentioned i havnt touched them yet as i want to finish assembling the unit first.
     
  5. german

    german Member

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    Great read, have been thinking about doing this to my old marantz. It's the 4140 model all the lights are out and i'm sure there's more wrong inside.

    Marantz amps just keep going strong, the older they are the more beautiful they become.
     
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    aokman

    aokman Member

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    they really are amazing amps, ive never seen that sort of build quality before... Really the only things that stop them running are stupid things like oxidized switches and maybe a cap or 2 :)

    you might like this aswell :)

    [​IMG]
     
  7. german

    german Member

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    Bet the new ones aren't made like that anymore.

    How hard/easy has the cleaning process been? Everything been pretty straight forward?
     
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    aokman

    aokman Member

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    well i will say it definitely isn't for a beginner if you want to completely strip it out and rebuild it. But it is certainly something worth learning aswell if your handy with a soldering iron and interested as its really worthwhile seeing how things were done back then by reversing the build :)

    Very nice amp aswell, im chasing more marantz amps from the same ERA especially one with a scope :D

    About the only annoying thing about these amps is the lack of detachable connectors on the boards most of the time you will have to cut wires label them and resolder them afterwards...
     
  9. 3Tone

    3Tone (Banned or Deleted)

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    That's probably one of the reasons they were so robust. Less change of connection coming loose, falling out etc.
     
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    aokman

    aokman Member

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    update time again :)

    plenty done this weekend, all of the bulbs have now been replaced with LED's - i have fitted diffuser blocks for all the source lights and fiddled with the main lighting until i got the uniform blue i was looking for :)

    Also at the last minute i decided to install 3.3uf metal film bypass caps in parallel with the main filter caps.

    Faceplate is back on and now i can work on the amp without fear of shorting something out :(

    [​IMG][​IMG]
     
  11. DeejW

    DeejW Member

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    looks awesome, well done. Shame we cant all hear it :p
     
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    aokman

    aokman Member

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    you will soon ;) i dont want to spoil it for you yet ;)
     
  13. mtma

    mtma Member

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    The blue LED lighting came out a bit tacky don't you think? Or perhaps it looks worse on the photo.
     
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    aokman

    aokman Member

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    its not that blue in real life, its a bit lighter i set it up to simulate what these amps used to look like back in their prime, they were always blue :)
     
  15. itachi46

    itachi46 Member

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    wats the bypass cap do?
     
  16. 3Tone

    3Tone (Banned or Deleted)

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    Ummm thats the colour of them originally n00b.
     
  17. itachi46

    itachi46 Member

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    mhm... their a little greener... in real life compared to that photo
     
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    aokman

    aokman Member

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    basically a bypass cap is put in to lower the output impedance of the electrolytic filter caps. They will smooth the power out even more :)

    They are very durable and quite expensive however @ $7 each for just 3.3uf @ 250v. Ive seen them up to 10uf @ 250v but they are very very big and cost about $25 each

    When i say expensive i mean relative to a 25c panasonic electrolytic of the same value ;)
     
    Last edited: Nov 15, 2009
  19. DeejW

    DeejW Member

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    tacky? as if. looks fantastic IMO
     
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    aokman

    aokman Member

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    they are a little bit, but mostly blue people have just forgotten what they look like, there are some pics of them using original light bulbs, they go green from age as the paper diffuser behind the plastic plate ages ;)

    heres one with original lights restored...

    [​IMG]
     

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