What part is this?

Discussion in 'General Electronics Chat' started by daniel123, Mar 29, 2013.

  1. daniel123

    Thread Starter New Member

    Mar 29, 2013
    1
    0
    This tuner knob is from a 20 year old piece of lab equipment, and is apparently not working. I don't even know if it is a variable resistor or capacitor. Can someone give me an idea of what it might be (and even better, how to find a replacement?)

    Thanks
     
  2. panic mode

    Senior Member

    Oct 10, 2011
    1,319
    304
    if i see correctly, there is a coil in there. this is a variable inductor
     
  3. sfeinsmith

    New Member

    Mar 20, 2013
    16
    1
    It seems difficult to view one side but it looks like tunable variable choke. If you can see ferrite slug inside the tube, if yes, it is a variable choke. I can see one wire broke loose. You need to check with LCR or ohmmeter to see if this choke winding is good. If not, then you can loose the winding by count how many turns then measure AWG wiring then you can rewind it. You can view youtube and get an idea to build a winding machine to create new one. Good luck
     
  4. Ron H

    AAC Fanatic!

    Apr 14, 2005
    7,050
    657
    I agree. Obviously, one of the connecting wires has broken off.
     
  5. bertus

    Administrator

    Apr 5, 2008
    15,646
    2,345
    Hello,

    It is a multi layer litze coil with a tuning screw.

    [​IMG]

    Bertus
     
  6. Neosec

    Member

    Feb 25, 2013
    36
    1
    Yup tuning choke. Coil is the red ring around the outside, the tuning slug is inside the tube and adjusted up and down by the screw at the top.
     
  7. #12

    Expert

    Nov 30, 2010
    16,261
    6,768
    Take it apart and wind a new one yourself?:eek:

    I don't think so.
     
    Ron H likes this.
Loading...