Luxman R-5045 - Needing help identifying component in AM/FM module

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  • mikkele86
    Senior Member
    • Apr 2017
    • 78
    • Danmark
    #1

    Luxman R-5045 - Needing help identifying component in AM/FM module

    hello.

    I came across this thing and im not sure what it is exactly, I have never seen such thing before.
    I know it gotta be some kind of diode with Drain, Source and Gate1 and gate2

    It resides in AM/FM module and im measuring 200ohm across D and S.

    Click image for larger version Name: image.png Views: 369 Size: 916.3 KB ID: 3256012​
    Tags: None
    • mikkele86
      Senior Member
      • Apr 2017
      • 78
      • Danmark
      #2
      and the back look ilke this

      Click image for larger version Name: image.png Views: 58 Size: 285.2 KB ID: 3256020​

        Comment

        • CapLeaker
          Leaking Member
          • Dec 2014
          • 8179
          • Canada
          #3
          It's an old school JFET used to amplify weak signals in the receiver

            Comment

            • eccerr0r
              Solder Sloth
              • Nov 2012
              • 8701
              • USA
              #4
              Before all the rage of MOSFETs being used as switches, they were used as class C signal amplifiers, and this is a dual gate MOSFET.

                Comment

                • mikkele86
                  Senior Member
                  • Apr 2017
                  • 78
                  • Danmark
                  #5
                  ahh okay. many thanks

                    Comment

                    • CapLeaker
                      Leaking Member
                      • Dec 2014
                      • 8179
                      • Canada
                      #6
                      Google “dual gate jfet” or look at a BF981

                        Comment

                        • CapLeaker
                          Leaking Member
                          • Dec 2014
                          • 8179
                          • Canada
                          #7
                          Actually this particular device is a GasFet 2SK85.

                            Comment

                            • eccerr0r
                              Solder Sloth
                              • Nov 2012
                              • 8701
                              • USA
                              #8
                              Eh... GaAs is fairly "recent" ... Is that a dual source or dual gate MOSFET? Depletion or enhancement?

                                Comment

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