Evan’s MK2 BeoLab Pentas

Viewing 7 posts - 21 through 27 (of 27 total)
  • Author
    Posts
  • #14438
    mexking
    BRONZE Member
    • Mexico city
    • Topics Started 1
    • Total Posts 36

      Wonderful thread Evan, congrats to a very nice work, looking good

      #14439
      Evan
      GOLD Member
      • Topics Started 4
      • Total Posts 53

        The worst of the sealing issues I found was actually around the twee-mid baffle edge. The foam is predictably rotted and without any life left however that wasn’t the worst part. Whoever assembled this foam tape originally back in the day completely missed the actual sealing edge / contour of the baffle. This is effectively an acoustical “short circuit”.

        IMG_0572IMG_0569IMG_0576

        #14440
        Evan
        GOLD Member
        • Topics Started 4
        • Total Posts 53

          Now its time to talk tweeters. As I mentioned earlier on, one of them was making zero output.

          IMG_0566

          One of my eagle-eyed colleagues noticed that the lead wire was broken. The coil measured ok (from the broken end) so I decided to do a repair.

          IMG_0567

          #14441
          Evan
          GOLD Member
          • Topics Started 4
          • Total Posts 53

            I attempted to solder the broken lead wire but unfortunately it is coated so nothing stuck to it. Next path was to take the butterfly off and take a turn off the coil and unwind some fresh lead wire. Sadly some more bad evidence of restaurant thrashing was hidden inside.

            I think someone cooked this coil a little too hard! The coil was loose in the gap and had come off the former!

            IMG_0570

            • This reply was modified 2 weeks, 6 days ago by Evan.
            #14442
            Evan
            GOLD Member
            • Topics Started 4
            • Total Posts 53

              Wonderful thread Evan, congrats to a very nice work, looking good

              Cheers, Soren! Thank you very much!

              #14443
              Evan
              GOLD Member
              • Topics Started 4
              • Total Posts 53

                Ok so I’m officially up the creek with only one working tweeter at this point. Being the time-impoverished individual that I am, I leapt up from my workbench and into the car. Drove up to the office to rummage around for some tweeters that might hold me over until I replace the fried one with another original SEAS unit.

                We seemed to be overstocked on these [very old build] H26TG06-06 units. These are almost completely unmatched in every way from the originals acoustically but they are an epic tweeter overall. I had to take the waveguide off of course and add some branding because stickers make everything better. Also had to glue down the butterfly as the clips that hold the waveguide on also secure the butterfly.

                IMG_8843IMG_8844IMG_8845

                IMG_8842

                #14446
                Evan
                GOLD Member
                • Topics Started 4
                • Total Posts 53

                  Last night was when everything came back together. I hauled them up stairs and plugged them in to the AVP. Just in time to watch an episode of our current series before falling asleep.

                  That glorious moment I have been working toward had finally come – time to flip the switch(es)!

                  The left BeoLab played sweet, sweet music but the BeoLab on the right was playing very loud 60Hz. Something is very horribly wrong. Sadly they will probably just sit for a while because I have been going hard on this project lately and as I pointed out earlier, those amps don’t make life easy. So unless I find another amp to run them on temporarily, it will likely be a while before this gets wrapped up. Wales is calling.

                  Luckily they are nice to look at. Thanks for reading and following along! If you happen to have a spare, functional amplifier I’d love to hear from you. Additionally if you have an extra Penta tweeter (SEAS 25 TNF H386) I’d love to take it off your hands.

                  IMG_0578

                  This isn’t over, but over for now.

                  • This reply was modified 2 weeks, 6 days ago by Evan.
                Viewing 7 posts - 21 through 27 (of 27 total)
                • You must be logged in to reply to this topic.