Pick up loses bottom end and gains upper midrange just before volume pot is wide open and when it is wide open. The full volume sound is skinny and yet in turning it down, just a bit, it regains the low end and maybe too much muddy mid. It's weird. Both of my pickups are pearly gates bridge pick ups and they are in my 78 gibson sg. Both of my tone controls on my guitar are disconnected. The tone problem occurred before and after the tone controls were disconnected and seemed to come on slowly over time. I have tried my guitar with other amps and the same effect occurs. *note...the tone problem is in Both pickups. This is a weird one. Thanks very much.
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Re: tone changes in pearly gates pick up
What you describe sounds like pickups fighting against each other meaning, does this occur when using pickups individually or together? This is normal when using more than one pickup together, if it occurs in single mode, something is wired wrong. Another thing is, If using single, are you splitting coils? Individual coils wired wrong can do this, a bad pickup selector switch can also. A loose wire or fiber touching the tone pot capacitor or ground could also. A dead coil on a humbucker can as well. I'm guessing that you are using these in combo meaning a possible pickup selector switch may not be switching properly. The player's level of experience is also in my mind since, all of my guitars do the exact same ONLY when I use more than one pickup. I hardly ever use more than one at a time unless I'm playing a strat.
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the switch, has three positions. Typically forward or up will be your neck (or rythm) pick ups, only and will work with one volume knob(usually top right as your looking at guitar), and one tone knob ( top left as your looking at the guitar). when the switch is in the far right or all the way down position, that will be the saddle (or lead) pick-ups. And that works with only one volume knob(bottom right as your looking at the guitar) and the corresponding tone knob. when the switch is in the middle position, botjh volume knobs work and both tone knobs work. You've gotta kinda play around with them to find whatever sound yopur looking for. and tone knobs are very subtle in their changes. good luck
if your replacing the existing pots. the values should be on the
backs of them. usually 500k for volume if using humbuckers and 100k for the tone pots. if your using single coil pick ups. its usually 100k across the board. but if you still need a diagram. what is the make and model of the instrument?
my guess is two positions at one end work(aka 1 and 2, or 4 and 5)?
if yes, then 2 of the pickups are wired wrong. (if 1 and 2 work, which are the forward positions, then the middle and bridge pickup are wired wrong, etc.)
the problem is there is a variety of 5way switches that are different. i would guess yours is "import" style. are there 8 lugs in a single row on the back of the switch?
if yes, you probably have an import switch.
best i can do in text is tell you that the middle two lugs are common. this means one goes to the volume pot, and there is probably a little jumper between the two lugs as well.
now there are 3 lugs on either side of those 2 common lugs. one set of 3 will probably run to the tone pot in some fashion or be empty. the other set of 3 lugs is for the pickup lead wires. it sounds like at least one or two of those lugs are empty but shouldnt be, or are wired wrong.
i cant tell you colors of your wires without seeing it, but this is how it should be, with the exception that the tone knob will probably be on the bottom 3 lugs somewhere. 1 would be the neck pickup, 2 the middle, and 3 the bridge
hope this helps, feel free to post a pic of your wiring, etc
It sounds like somehow the pre-gain is very high while the volume or post-gain is very low. Try turning the volume high on the effects unit and the gain low, and don't have the amp volume too low either.
The most I can suggest for getting the shine back to the bass is to run an EQ before your preamp. Make sure all sliders are set to zero, then raise the higher frequencies until you get the sound you're looking for. This won't lose any growl, just accentuate the brilliance.
The best EQ to use would be a BOSS Bass Equalizer. You can use the same on your old T-Bird to accentuate the lower frequencies, and get almost the same sound.
for your set up, all u have to do is to do is wire the positive parallel form the pick-up or volume knob into the middle lead of the pot, wire the negative parallel to the casing of the pot, and put a .022- .033 ohm capacitor from the casing to the pot lead on the right, when viewed from the bottom. wiring parallel means "tapping into" the circuit, not rerouuting the circuit.
i am guessing on what the problem is , the post is very vague. i am guessing a channel switching issue. you need to check the "sugar cube" looking power resistors solder welds. they are probably cracked and arent making good contact. if you tap on the amp it will cut in and out, its probably these two resistors. they are usually 470ohm 5 watt cement resistors. what happens is they get real hot, and as they cool down they crack the little solder welds. i usually replace them with new and keep them floating up over the pcb to help them stay cool and off of the board to prevent further solder weld cracking, stock they are real close to the board. then put a little silicon under the resistor to hold it in place and to keep it still on the board. i just fixed a blues deluxe with this issue. while you are in there, cut out the resistor sitting right behind the reverb pot, this will make the reverb awesome. also solder the mid pot center leg to the mid pot leg that comes off of the bass pot leg to get better midrange control. very easy mods. check the master volume pot, is it a B100K? pull it and put an A250k in its place for better volume control. bias pots , etc. check my website yostamplifier.com.
If you can't clean the pots or if you just want to try replacing them, try using
500k pots again, in case one or both of the pots is worn or dirty or
defective. If that doesn't work, and cleaning or replacing the
switches doesn't work, then the problem is probably elsewhere. You could put a 500k resistor (with a sufficiently-high power rating of at least half the power rating (Watts) of the pot) in parallel with the pot, or, to cover all bases, put a 500k resistor from each of the two outer lugs of the pot to the middle lug. That should change it into the equivalent of a 250k pot. You could even just temporarily clip the resistors on, with alligator-clip leads, if you're very careful, just to test it.