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Unable to find replacment potentiometer

Discussion in 'Troubleshooting and Repair' started by HFoster, Dec 31, 2018.

  1. HFoster

    HFoster

    2
    0
    Dec 31, 2018
    Hi, i've been trying to fix this myself for a couple of days and have got stuck.

    i was given a B&W Aura AUV-80LE-MIR amplifier which had its volume dial broke along with a pair of speakers.

    i noticed the right channel only worked if the volume dial was messed with and the nut tightened or loosened. i tested the speakers and the wiring and that was all fine so it had to be dial.

    i took the case apart and did some research and it seems that the dial is an alps potentiometer unfortunately the markings have smudged and i cant make out what it says. on the board where the unit is soldered it says VR201

    i did some googling and i think i am after a 200 ohm dual gang potentiometer

    the problem is i cant seem to find any parts matching this description. i can find 200 ohm single gang and a variety of dual gang but nothing identical

    i have tried cleaning the dial but that finished it off and i cant get the right channel at all now

    any help would be greatly appreciated
     

    Attached Files:

  2. Harald Kapp

    Harald Kapp Moderator Moderator

    9,230
    1,861
    Nov 17, 2011
    200 Ω sounds unlikely low to me. 20 kΩ is more likely the value your're after, but that is pure guesswork as I haven't been able to locate a schematic or service manual. See e.g. here.
     
    BobK likes this.
  3. BobK

    BobK

    7,609
    1,648
    Jan 5, 2010
    Agree with Harald. What markings are you reading? I cannot see them well enough in your pictures.

    Bob
     
  4. HFoster

    HFoster

    2
    0
    Dec 31, 2018
    hi, thank you for the replies

    in the first picture on the PCB it has VR201 written on it to the right of the Pot, the markings on the back of the Pot are illegible even in person
     
  5. 73's de Edd

    73's de Edd

    2,678
    1,085
    Aug 21, 2015
    Sir HFoster . . . . .
    . . . . . . . . . .


    The VR201 is just their generic component identification assignment of the control.
    For example VR is variable resistor assigned to one SECTION of the unit, its associated neighbors should be VR202 VR203 its sections capacitors should be C200 C201, C202, C203------C219 or its resistors R200, R201, R201-------R215 . . .etc.

    Try ohming across the end to end terminals of both the front and rear section to see what resistance you get. Then swing the rotor to one end and retest.
    then swing the rotor to the opposite direction and retest. The highest resistance read should be the best possibility of the pots value , considering that there might be a shunting in of other circuit resistance with the rotor at some positions..
    Typically that right sides molded lettering would be the resistance value.

    Like . . . .503 for 50K 104 for 100k ohms .
    The still spaced apart readable X2 is confirming a dual / tandem control.

    Then you place the rotor at mid position and expect a different ohmic reading to each side terminal to the center rotor connection.

    Considering this could be a volume function and you would only have equaled side to side readings on linear pots.. . . . which might be a tone control oriented function pot.
    Check some other controls to either side to confirm their modus of numbering "scheme" in comparing to your illegible one.

    73's de Edd . . . . .
    . . . . . . . . . .


    Sometimes . . . . . . I wonder how much deeper the ocean would be, without all of its sponges.
     
    Richard9025 likes this.
  6. WHONOES

    WHONOES

    664
    134
    May 20, 2017
    If it is a volume control then the absolute value is not that important perhaps something in the range of 10K to 20K. The control is ratio metric. If it is a tone control pot then, the value is more important.
     
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