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A&R Cambridge A60 tidy up

Discussion in 'd.i.y.' started by kicker, Oct 18, 2017.

  1. kicker

    kicker Member

    First listen has presented a couple small issues, the remaining pots are a bit noisy so I have ordered some 22k linear ones to replace them, also I get a hum when touching the volume knob, is this just a matter of earthing the pot housing?

    Other than those couple things it is sounding very good so far.
     
  2. Operajulian

    Operajulian Opera Julian

    I had that problem when replacing the volume pot with an ALPS on one of mine - in fact it also picked up radio until additional earth was run back to the board. I trapped an earth cable to the volume locking nut, soldered it to all the other (old) pots and then crimped it back to a ring tag and screwed to earth. The earth cable is a bit chunky as that is all I had at the time. It solved the problem.

    The balance and tone controls are not really worth changing and hard to find a same value match. Have a few goes at contact cleaner and settle for that.

    lets see if I can add a link to a photo.
    https://www.flickr.com/photos/158915456@N07/37999589696/in/dateposted-public/


    Happy listening
    Julian
     
  3. kicker

    kicker Member

    Awesome, thanks Julian. My fix will probably look much the same as I only have 10A automotive wire at the moment.
     
  4. ansis

    ansis pfm Member

    I think earthing wire over pots body's was standart on later models, at least thats what I have seen on one I worked on.
     
  5. Andrew.B

    Andrew.B pfm Member

    Looks good, RS are great for parts :)
     
  6. kicker

    kicker Member

    My new cover is almost finished, here it is mocked up.
    I just need to seal the underside and glue in the brackets for the screws.

    [​IMG]

    A bit unusual but I'm a big fan of brutalist architecture and it was easy to make.
     
  7. Durmbo

    Durmbo Not French

    :D

    Until I saw this I thought nothing could outdo either the teak or rimu covers.

    Yours has to be the most original and striking amplifier casing I've seen. Might even make it sound better, too ;)

    I love it. It's from a concrete block, right? Again, well done.
     
  8. kicker

    kicker Member

    Cheers!
    It turned out more or less as I was hoping. It's a cast piece, I just made a basic mold to suit the amplifier much the same as the wood cover but thicker and missing the channel the front and rear panels sit in.
     
  9. Operajulian

    Operajulian Opera Julian

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