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Post by frets on Aug 24, 2020 11:41:44 GMT -5
Happy Monday Guys, I have this Les Paul I’m starting to make, and in it, I want to do a one Volume with a Bass Cut, Treble Cut and Midrange Shaper - making it a PTBM. Would one of the Angels verify that my diagram is correct? I really appreciate it. I drew it up last night.  |
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Post by newey on Aug 24, 2020 12:58:27 GMT -5
A mite confusing, as you have 3 pots labelled "A500K", one labelled "A1M", but then at the bottom it says "all pots are 250K".
Wiring looks OK to me, but let's get a second set of eyes on it. Also, I se 1M pot for the treble cut, but only 500K for the bass cut. Most of the PTB schemes we've seen use a 1M pot for the bass, in order to achieve a more significant cut.
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Post by ashcatlt on Aug 24, 2020 13:23:48 GMT -5
Yeah no that don’t look right to me. I think you’ve got the treble and bass cut labels swapped, and also that whole thing connects to the circuit wrong. I think the purple wire from the switch wants to go to where the yellow wire hits the bass cut that you’ve labeled treble cut, and that yellow wire from the V pot wants to go the wiper of the bass cut along with the pink and cyan that are already there. But then again you can sometimes wire filters upside down and get them to work, so maybe I’m way off??? Do you have a reference that you’re working from?
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Post by frets on Aug 24, 2020 13:37:45 GMT -5
Thanks guys, I do have the label reversed Dag Nabbit! And the pots aren’t all A250k. I’ll fix those.
I came up with this one from the Strat one I came up with, which came from my mentor (who has now passed 😞). The whole PTB is wired differently than a regular 3 or 4 control harness, but the more I worked on it, the more I started getting confused if I had it right. So I have one vote that the wiring is okay and one vote that it’s off. I will fix those labels and replace it. I really appreciate your help with this. I’m tired and looking at one’s own work can end up with not noticing something(s) important (obviously!!)
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Post by frets on Aug 24, 2020 13:46:07 GMT -5
I haven’t changed any of the wiring given Ascatit said it looked wonky but Newey said it looked okay. Maybe another Angel will weigh in. I really appreciate it.  |
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Post by ashcatlt on Aug 24, 2020 14:29:03 GMT -5
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Post by frets on Aug 24, 2020 16:19:56 GMT -5
Ash,
I’m working on changing it to as you suggested. I’ll be back with it. I appreciate your help.😸
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Post by JohnH on Aug 24, 2020 16:33:39 GMT -5
there is something not right. With a bass cut, usually the whole signal is forced through it on its way from pickups to volume pot. But as drawn so far, there is a direct route from switch to volume to out. Not sure where the mid-shaper should best be relative to the bass and treble.
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Post by newey on Aug 24, 2020 16:38:57 GMT -5
I haven’t changed any of the wiring given Ascatit said it looked wonky but Newey said it looked okay. Maybe another Angel will weigh in. I really appreciate it. Trust ash on this sort of thing more than me. |
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Post by reTrEaD on Aug 25, 2020 0:12:33 GMT -5
there is something not right. With a bass cut, usually the whole signal is forced through it on its way from pickups to volume pot. But as drawn so far, there is a direct route from switch to volume to out. Not sure where the mid-shaper should best be relative to the bass and treble. I reckon the mid-notch and treble-cut would both be a bit better before the bass cut. I think just one move could make it right ...  What do you and ashcatlt think about this? Also, the 1M resistor on the CW end of the Bass-cut seems okay. That will add a bit more loading and allow for more bass cut than without. Not sure about the 1.8nF cap and 1M resistor from the CW end of the Mid-notch to ground, though. Seems like it would be better without them. *shrug* |
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Post by ashcatlt on Aug 25, 2020 11:18:06 GMT -5
What do you and ashcatlt think about this? I think you’re right. THAT matches “the Strat” and G&L and I’m sorry I missed it. I thought about that too, but this seems to be a relatively common thing based on a commercial product. I ran across it in my googling yesterday, but don’t remember the manufacturer. Edit - the 1M hanging off the bass cut is also parallel to the V pot, and basically just makes that look a little smaller. Yes that’ll shave off some top end overall, and it’ll make the bass cut a little deeper. |
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Post by frets on Aug 25, 2020 11:57:21 GMT -5
Okay Fellas, Here is the revised thanks to Ash, just a couple of wires moved. Let me know. It’s actually Draft #3  |
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Post by ashcatlt on Aug 25, 2020 12:05:29 GMT -5
Well you did what I said, but I was wrong.   reTrEaD has it right just above here. |
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Post by frets on Aug 25, 2020 14:30:09 GMT -5
Got it, thanks to you Ash, ReTrEaD and John for coming to my rescue. I don’t know if you guys have ever fiddled with a PTB, they are quite powerful, I believe adding the Midrange Shaper will provide that last step to finessing one’s tone. Thanks again to all you Angels😇.
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Post by ashcatlt on Aug 25, 2020 15:01:45 GMT -5
Glad to help of course. I never really mess with pots on my guitars. Those which I haven’t rewired just stay on 10 or 0 and those which I have rewired are all replaced by switches. I do have a “strangle” switch on my Rickenbacker, and while I do dig that tone, I don’t love the volume drop that comes with it. Mostly, there’s usually other knobs further down the chain that I can use instead.
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Post by JohnH on Aug 25, 2020 16:47:48 GMT -5
I might try to sim it in SPICE or GuitarFreak, then we can take it for a virtual drive, spin the wheels, crash test it etc.
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