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Remote diagnosis will require photographs.*
* Please include some of the jack socket.
the pots in question are CTS 450 series 10% tolerance dimple backs.
The cap is indeed a .047uF
and on the jack the red goes to the tip and the blue to the sleve.
Hope that helps.
Cheers
M
Your wiring looks fine, I can't help thinking the pot is at fault.
A indicates logarithmic (audio) taper, typically 15-20% resistance halfway.
D (a.k.a. A2) is a more extreme log taper, say, 10% resistance halfway.
If the tone pot is an A2 taper, most of its effect will occur in the last quarter of the rotation towards maximum cut.
That result is actually what you get with a linear pot. It’s odd that it’s doing it with an audio taper…
If the pot isn’t faulty, the problem is that the taper isn’t logarithmic *enough*, not that it’s too much. You need lower resistance in the middle of the taper to give a smooth sweep. 10% log works best, 30% audio taper not much better than linear.
Does the tone change very abruptly at the very bottom, as the wiper comes into contact with the end of the track? If it does, it sounds like the track is damaged. You can try squeezing the terminal onto the trackboard with a pair of pliers and see if that helps, but unless it’s only working when the wiper actually touches the metal (they don’t usually) then it won’t.
"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
so I've tried a couple of different pots - a 500k log, a 500k lin, a 250k log. And two different caps both .047uF.
all have the same effect and as you say the tone changes abruptly at the bottom. Not quite and on/off - but not far off it.
I can only think I must of wired something up wrong? I have rewired a few guitars and have always managed to get them working (in the end) but I'm a bit confused on this! Anything obvious I could of messed up?
Cheers
Mark
Trying to persuade a Metric splined control knob onto an Imperial pot shaft. This can go wrong in two ways.
EITHER the plastic cracks
OR excessive downward force pushes the innards of the pot apart, rendering it ineffective.
This may be repairable by carefully undoing the tabs and repositioning the innards back into alignment.
I've tried it both ways and by passed it.
I've also tested the pot on a multi meter and i get a nice smooth adjustment from 0 to 500.
so i must of messed up something else... hmmm
As for "when am I ready?" You'll never be ready. It works in reverse, you become ready by doing it. - pmbomb