Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: 1blueheron on February 03, 2020, 01:40:52 pm
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I am getting ready to wire up my pots on the plexi build. The both huss and sluckey drawings show treble, bass, mid. I want the order of the pots to be treble, mid, bass as that seems more ergonomically convenient to use. I understand the schematic is not representative of the physical location.
If I use the drawings as shown by Huss and Sluckey, but re-arrange the pots to my desired order it seems like I will be making unneccesary spaghetti. Can I instead use the third drawing or am I being a Bozo and missing an important fundamental? I have a habit of wiring pots backwards in previous projects and would like to get this right the first go around.
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Here's a link that can help describe the basics of whats happening: https://robrobinette.com/How_The_TMB_Tone_Stack_Works.htm (https://robrobinette.com/How_The_TMB_Tone_Stack_Works.htm)
From an order perspective, it doesnt matter which of the bass or mid controls comes first in the circuit. Also, ergonomics in the physical layout of the pots doesnt matter when it comes to the schematic aside from wiring ease. You could schematically use either and use a common layout to make it reflect TMB. I feel like most layouts do it this way regardless. All that matters is that the connections match.
In these circuits, treble has to be in its place, the incoming signal isnt choked down by that 33k resistor that feeds the bass and mid controls. They are paralleled off that same resistor so their order is of no consequence.
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> I will be making unneccesary spaghetti.
Not enough for a meal.
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Your bozo wiring is wrong!
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OK, thanks. I figured I was being a bozo and had it wrong. I will attempt PRR's redo although since this is a PTP build, it might not be quite as simple as swapping a couple lead wires.
I agree the way PRR draws it, it won't be enough extra spaghetti for a meal but combine that with me being a meatball and you get pretty close. :l2:
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You do not change the schematic just because you want to rearrange the pot layout. My pots are not laid out TBM. They are laid out TMB, just as you want. Don't get wrapped around the axle on this. Wire them IAW my layout and they will look like you want and work the first time. And it won't look like spaghetti.
http://sluckeyamps.com/6v6plexi/6v6plexi.pdf
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You do not change the schematic just because you want to rearrange the pot layout. My pots are not laid out TBM. They are laid out TMB, just as you want. Don't get wrapped around the axle on this. Wire them IAW my layout and they will look like you want and work the first time. And it won't look like spaghetti.
http://sluckeyamps.com/6v6plexi/6v6plexi.pdf
I see now. The schematic makes it look like TBM but after looking at the layout diagram page further, I see it clearly lays out the TMB pot wiring. Since I was going PTP I had not payed much attention to the layout page which was board oriented.