Funny Potentiometers - Jemsite
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post #1 of 12 (permalink) Old 04-12-2008, 11:07 AM Thread Starter
 
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Funny Potentiometers

Hello Jemsiters !
Might be a funny question about my potentiometers on 7 vwh.
They should work something like that: 1,2,3,4,5,6,7,8,9,10-increasing tone and volume in the same incremenets,from silence to maximum signal.
Instead,they work something like that : 1,1,1,5,5,5,10,10,10,10 ,meaning there is no smooth "acceleration" in tone and volume.
Is that normal case with vwh's ?
What should I do,to go again to local guitar store ,to replace potentiometers, to fix it...?
Any help will be very appreciated ,thanks.
BH
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post #2 of 12 (permalink) Old 04-12-2008, 11:09 AM
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Re: Funny Potentiometers

It's pretty common with most stock pots.
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post #3 of 12 (permalink) Old 04-12-2008, 05:52 PM
 
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Re: Funny Potentiometers

Replace them with audio taper pots.
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post #4 of 12 (permalink) Old 04-12-2008, 05:56 PM
 
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Re: Funny Potentiometers

I've seen worst ones, something like 1, 1, 1, 1, 1, 1, 1, 1, 10, 10.
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post #5 of 12 (permalink) Old 04-12-2008, 10:24 PM
 
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Re: Funny Potentiometers

This is how it was explained to me a long time ago. (Some of you more technical guys please correct where I go astray...)

Linear Potentiometer: across the dial the % of current allowed through increases incrementally (step by step with all steps being equal in size)
Logarithmic Potentiometer: across the dial the % of current allowed through increases "logarithmically" (think "Xeno's paradox" for an example- each step is half the distance to the end)

Kinda like this (numbers given for ease of illustration, not for accurate measurement):

Knob:----Linear:---Log:

1--------10%------50% (halfway from 0% to 100%)
2--------20%------75% (halfway from 50% to 100%)
3--------30%------87.5% (halfway from... well, you get the idea)
4--------40%------93.75%
5--------50%------96.875%
until...
10-------100%----100%

Linear pots sound smoother in transition but you have to turn them farther to make a change. Log pots aren't as smooth but are quick-acting.
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post #6 of 12 (permalink) Old 04-12-2008, 10:39 PM
 
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Re: Funny Potentiometers

Hmmm... Also, if a 3db change in volume (versus a doubling of db) is perceived as a doubling in volume, wouldn't a linear pot actually sound like lots of nothing until it actually sounded like everything all at once?

Using a linear pot would not provide any real subtlety over volume control, whereas a logarithmic/audio pot gives a smoother curve and therefore a smoother volume swell.

I know some folks like to use linear for tone and log/audio for volume so the volume can smoothly swell and the tone can wah...

Something like that...
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post #7 of 12 (permalink) Old 04-14-2008, 02:46 AM
 
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Re: Funny Potentiometers

You are correct 6stringer about Log. and Linear pots.

As for which is better, I am not sure since I have never compared. Think I might try that sometime soon...

As to the OP's original question, sometimes pots can get dirty inside and this will affect the pot's operation... try cleaning it out with IPA or something similar. Electronics stores usually sell "Electronics Cleaner" in bottles which is basically like IPA, it can be had for pretty cheap.

'87
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post #8 of 12 (permalink) Old 04-14-2008, 03:02 AM
 
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Re: Funny Potentiometers

I want to replace the volume pots on my new hot rod deluxe with audio pots. I read somewhere that fender used the non-audio tapers as a marketing tool. When people played the amps in stores, they would think "this amp is loud as hell on 2! I'm buying it." The stock pots make it very hard to make changes at low volumes i.e. apartment practice.
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post #9 of 12 (permalink) Old 04-14-2008, 09:44 AM Thread Starter
 
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Re: Funny Potentiometers

My 7 vwh is almost brand new,I've got it only for couple of months ,so any dirty in pots is excluded.

More likely it is about logarithm vs linear control (tanks to 6stringer for nice explanation)

Anyone is more happy with audio pots than with logarithm ones (or oposite) ?

Cheers,
BH
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post #10 of 12 (permalink) Old 04-14-2008, 10:21 AM
 
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Re: Funny Potentiometers

I always thought you should use log pots for volume and linear pots for tone (as the ear is logarithmic in sensitivity), Then I looked at the circuit for a 7VWH and according to that the volume is linear and the tone is log! I haven't checked that this is how mine is wired up but I'm happy with the operation of my controls, you could check the pots haven't been swapped as they're the same value just different tapers. even if they are as described in the diagram you could still just swap them over and see if you prefer it.
Jim
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post #11 of 12 (permalink) Old 04-14-2008, 11:28 AM
 
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Re: Funny Potentiometers

Quote:
Originally Posted by Big Hary View Post
More likely it is about logarithm vs linear control (tanks to 6stringer for nice explanation)
Glad to be of service- and thanks to Shredder87 for the double-check/ affirmation. Log/Linear gave me fits when I started rewiring/building
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post #12 of 12 (permalink) Old 04-16-2008, 12:15 PM Thread Starter
 
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Re: Funny Potentiometers

Thanks Jim !
How to swoop the pots ?
Is there any instruction on the net ?
BH
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