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Unable to find replacment potentiometer

HFoster

Dec 31, 2018
2
Joined
Dec 31, 2018
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2
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
 

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BobK

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

Bob
 

HFoster

Dec 31, 2018
2
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Dec 31, 2018
Messages
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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
 

73's de Edd

Aug 21, 2015
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Aug 21, 2015
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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.
 

WHONOES

May 20, 2017
1,215
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May 20, 2017
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1,215
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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