Tone pot malfunctioning?

Boreas

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Make SURE what you CAN'T see of the pot terminals and eyelets are NOT touching any of your copper shielding tape. See arrows. Even a single strand of wire or an errant solder blob can ground out your pot or signal. May want to flatten that foil more and cover with a piece of electrical tape near the pot wiring. Same with output jack and the switch. It is difficult to tell with the pix how much clearance there is.

2022-12-03_10h57_12.jpg
 
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schmee

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Thanks for the response Peegoo,
......
I believe the only outstanding issues now are:
1. Volume doesn't go to 0.
2. Tone is binary. Total mud or high bright. It's not sliding up as it should
-The volume pot may be defective and not going to 0 ohms. Easy to check with a Volt Ohm Meter. Do you really care though?
-Tone control is actually a combination of Volume pot AND Tone pot. The value of the capaitor on the tone pot changes the sweep. Too high a value and the tone jumps from bright to muddy.

Volume pot:
A 500K volume pot makes the guitar overall brighter than a 250K volume pot. The value of the tone pot doesn't affect the overall brightness of the guitar anywhere near the amount the value of the volume pot does.

value of the tone cap: if you want to change how dark/muffled the tone gets with the tone pot turned most of the way down:
-higher cap values get pretty muffled, using a .033uf or .022uf or .015uf will give you a less dark/muffled tone with the tone pot cranked all the way down –

The value of the tone cap (.0025mfd, .02mfd, .1mfd, etc.) will determine the cut-off point for the highs.
With a smaller value, like .015 ...when rolled off, you will notice a subtle change in your high frequencies – "you can only get your guitar to sound so dark."

A higher value of tone cap (.1mfd) will roll off the most amount of highs, getting into your high mids. You will get the darkest and deepest roll-off with higher value caps. The tone may jump from bright to muddy.
 
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PoopSoupGuitars

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Make SURE what you CAN'T see of the pot terminals and eyelets are NOT touching any of your copper shielding tape. See arrows. Even a single strand of wire or an errant solder blob can ground out your pot or signal. May want to flatten that foil more and cover with a piece of electrical tape near the pot wiring. Same with output jack and the switch. It is difficult to tell with the pix how much clearance there is.

View attachment 1057815
Thanks man, pretty sure this is the issue!
 

PoopSoupGuitars

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-The volume pot may be defective and not going to 0 ohms. Easy to check with a Volt Ohm Meter. Do you really care though?
-Tone control is actually a combination of Volume pot AND Tone pot. The value of the capaitor on the tone pot shcnges the sweep. Too high a value and the tone jumps from bright to muddy.

Volume pot:
A 500K volume pot makes the guitar overall brighter than a 250K volume pot. The value of the tone pot doesn't affect the overall brightness of the guitar anywhere near the amount the value of the volume pot does.

value of the tone cap: if you want to change how dark/muffled the tone gets with the tone pot turned most of the way down:
-higher cap values get pretty muffled, using a .033uf or .022uf or .015uf will give you a less dark/muffled tone with the tone pot cranked all the way down –

The value of the tone cap (.0025mfd, .02mfd, .1mfd, etc.) will determine the cut-off point for the highs.
With a smaller value, like .015 ...when rolled off, you will notice a subtle change in your high frequencies – "you can only get your guitar to sound so dark."

A higher value of tone cap (.1mfd) will roll off the most amount of highs, getting into your high mids. You will get the darkest and deepest roll-off with higher value caps. The tone may jump from bright to muddy.
Yes, will certainly be replacing the cap. It's a humbucker neck & single coil bridge w/500K pots. Any recommendations?
 

PoopSoupGuitars

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Uh? Tin/lead solder readily available on UK Fleabay


Doug
We fought our way out of the UK over 100 years ago thank god.

Now our new EU overlords say no lead!
 

schmee

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Yes, will certainly be replacing the cap. It's a humbucker neck & single coil bridge w/500K pots. Any recommendations?
I'd try an .022uf or even a .015uf just to see how it smooths out the tone pot changes through the sweep. Sometimes it seems to work, other times not so much. Go figure.
 

Wayne Alexander

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OP, you mentioned that you were using one audiotaper 500K pot (that's the A500K) and one linear taper pot (that's the B500K). Use audiotaper pots for volume and tone controls, they'll have a more gradual/normal signal strength reduction as you turn the pot down. Linear taper pots will have have uneven strength reduction as you turn the pot down.
 

PoopSoupGuitars

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I'd try an .022uf or even a .015uf just to see how it smooths out the tone pot changes through the sweep. Sometimes it seems to work, other times not so much. Go figure.
Will buy a selection and do some testing. Currently have a .047 in there which is presumably messing up the bridge?
 

PoopSoupGuitars

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OP, you mentioned that you were using one audiotaper 500K pot (that's the A500K) and one linear taper pot (that's the B500K). Use audiotaper pots for volume and tone controls, they'll have a more gradual/normal signal strength reduction as you turn the pot down. Linear taper pots will have have uneven strength reduction as you turn the pot down.
So you recommend both being A500K? Will try that when replacing the cap
 

PoopSoupGuitars

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Wanted to say thanks to everyone on the thread for all of your patience and advice today. Crazy that a forum designed for 1 specific design of guitar can develop such a helpful community & provide such a valuable (free) resource to someone looking to learn a new skill.

👨‍❤️‍👨👨‍❤️‍👨👨‍❤️‍👨
 

Boreas

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So you recommend both being A500K? Will try that when replacing the cap
Personal preference. PLUS, it has a lot to do with pickups and caps. Some people don't even use a T pot. I would lean toward a 0.022uf cap or lower with 500k pots. I am not a fan of mud. You can also clip caps in place temporarily to see what they do
 




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