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Author Topic: BAD HUM WITH VOLUME POTS DOWN??  (Read 2119 times)

Offline Mon

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BAD HUM WITH VOLUME POTS DOWN??
« on: October 21, 2010, 08:33:11 PM »

Hi, there!

I have this korean made Washburn Fallen Idol (#48 of 50), and it's humming badly when the volume pots are completely down (both PUPs).

Any hints? HELP!

Cheers!

Mon.
 

Offline BlueBuddha

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BAD HUM WITH VOLUME POTS DOWN??
« Reply #1 on: October 22, 2010, 04:01:56 AM »
might not be earthed correctly, open up the control cavity and see if there are any wires that aren't soldered to something, that look like they used to be.
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Offline Mon

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BAD HUM WITH VOLUME POTS DOWN??
« Reply #2 on: October 22, 2010, 09:56:04 AM »


It's been checked and re-checked thoroughly... :-(

Note: With any of the volumes up, the hum goes away... :-S
 

Offline ncmreynolds

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BAD HUM WITH VOLUME POTS DOWN??
« Reply #3 on: October 22, 2010, 10:09:23 AM »
I've seen this happen where the 'hot' from the pickup goes to the centre tab (wiper) on the pot and the output is taken from the outer tab.

If you wire pots this way then the output of the guitar is 'floating' with the volume at zero rather than grounded, hence the hum.

If this is the case you can solve this by swapping the two connections round. However it will change the behaviour of the guitar when using both pickups and one volume control at or close to zero.
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Offline Mon

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BAD HUM WITH VOLUME POTS DOWN??
« Reply #4 on: October 22, 2010, 11:19:48 AM »
Although I've experimented with polarity swapping in the past for other reasons than this, I've never done it because of this problem before...

I'll give it a try, tho. Thanx a million!

C'mon, guys! ANY input will be highly appreciated!