828 schematic/parts

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Viewing 8 posts - 1 through 8 (of 8 total)
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  • #15199
    Avatarshred
    Participant

      Hi,
      Could I please have a schematic for an 828?
      I need to source and replace a few gain antilog pot’s – any ideas/prices?
      Any idea of the value of these today?
      Thanks

      #15563
      Ted FletcherTed Fletcher
      Keymaster

        I can certainly let you have the schematics for the 828, but I only have details of the series 2 version…. but that’s likely to be the one you have.
        As for pots, these were ‘Omeg’ pots and I don’t use them or hold any stocks any more, but you might find them in RS or Farnell.
        I will email you the circuits and layouts. :)

        #15564
        AvatarPhanTom
        Participant

          Hi!

          I’m from Hungary and speak very little English. Sorry.

          I have a Alice 828 (MHF 24-1-83, SN: 777-2357), but unfortunately it does not work. Maybe any IC (HAI-4741-5) broke. An alternative would like to ask us for this IC is unknown. As can be replaced?
          It would be nice to have a schematic, to see the connections as.

          Best Regards

          Thomas

          #15565
          Ted FletcherTed Fletcher
          Keymaster

            Hi Thomas, the IC you talk about is the Harris 4741 and it is probably difficult to source now. It is simply a quad version of the 741 and has the same connections as the TL074, and you could probably replace it directly with the TL074.
            I will email separately with the circuit diagrams. :)

            #15566
            AvatarPhanTom
            Participant

              Dear Ted,

              thanks to Your Information and email. Great Help for me!

              Kind regards

              Thomas

              #15567
              AvatarPhanTom
              Participant

                Hi!

                Again here. I swapped each IC. Only the 4016 has not been replaced. Now it works, but …
                Normal mode, only the right side reads, PFL mode, only the left side. Maybe the 4016? I don’t know.

                Kind regards

                Thomas

                #15568
                Ted FletcherTed Fletcher
                Keymaster

                  Yes, that sounds very much like a fault in the 4016…. this is used as the change-over switch in the PFL circuit, so that would be it. 😥
                  But you are getting there! :)

                  #15569
                  AvatarPhanTom
                  Participant

                    Thanks Ted!

                    Exchanged and I’ll tell you the results! This is a very good desk, I like! It would be nice to work with him again :-)

                    Thomas

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