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"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
JM build | Pedalboard plans
If the wiring is correct and nothing is touching anything it shouldn’t be, and it’s still sucking tone, one of the jacks is partially shorted.
First check if the contact on the output jack is touching the back of the pot when a plug is in it first. Pull the wiring gently so you can see where the individual wires go, and make sure the two wires from the tip contacts on the jacks go to the middle terminals on each side of the switch, and there are no other connections to them.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
JM build | Pedalboard plans
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
That seems to be the case:
Here are the readings from the meter:
When bypassed:
Input tip to ground: 100k when volume pot on max, 0 when volume pot on min
Output tip to ground: 100k when volume pot on max, 0 when volume pot on min
When engaged:
Input tip to ground: 100k when volume pot on max, 0 when volume pot on min
Output tip to ground: 1000k regardless of volume pot setting
So I think there is a short.
Which wire(s) should I unsolder?
One final observation: if I pull gently upwards on the connection from the wire marked "output tip" above into the switch, the short goes away (output tip to ground measurement goes to INF). I can't reproduce this effect (by pulling on any of the switch connections) for the input tip to ground measurement.
JM build | Pedalboard plans
(The labels are hopefully incorrect by the way - the middle one on the left should go to the input tip, not the power negative.)
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
If the output jack was faulty, with a partial short between the tip and sleeve, would that cause the same tone suck when in bypass?
Oops, you're right of course.
JM build | Pedalboard plans
When the pedal is (true) bypassed there are only three components in the circuit - the jacks and the switch. If there is a fault - and assuming the wiring is correct - it can only be one of these.
Are you absolutely certain you didn't accidentally refit the old switch?
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Looks like I need to buy another switch then ...
JM build | Pedalboard plans
Temporarily disconnect the wire to the volume pot and see if the tone suck is gone in bypass. (The pedal won't work when it's on.)
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
JM build | Pedalboard plans
Is it from the same batch as the original? It seems beyond any sort of believable coincidence otherwise!
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Next question: after all that, do I actually like the pedal when I give it a proper try at next week's band practice ... ?
JM build | Pedalboard plans
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein