Volume changes more than the level
A passive pickup, volume pot, cable capacitance and amplifier input form an interacting impedance network. Moving the wiper changes attenuation and the impedance driving the load. As a result, rolling down can change high-frequency voltage response as well as overall output. How noticeable that is depends on the circuit and listening conditions.
A treble bleed supplies an additional path between volume signal input and wiper. In Apparition’s convention those are lug 3 and lug 2. It is not a tone capacitor wired to ground, and it does not remove the need for the pot’s normal ground connection. The same capacitor type can do a different job when connected to different nodes.
Capacitor-only: a frequency-dependent bypass
A capacitor between input and wiper provides a bypass whose impedance falls with increasing frequency. It allows more of the higher-frequency signal around part of the volume resistance. The capacitance controls how that bypass interacts with the pot and load; it does not correspond to a universal amount of preserved treble.
A network that helps at one volume setting can give an overly prominent high-frequency balance at another. Larger capacitance also extends the bypass effect further down in frequency. Evaluate several useful positions rather than accepting a pleasing full-volume comparison as evidence: at full volume there is little resistance between input and wiper for the bleed to bypass.
Adding a resistor changes the network
| Form | Circuit role |
|---|---|
| Capacitor only | Frequency-dependent input-to-wiper bypass |
| Capacitor and resistor in parallel | Adds a resistive bypass as well as the capacitive path |
| Capacitor and resistor in series | Limits the capacitor path with series resistance |
A parallel resistor is connected across the same input and wiper nodes as the capacitor. It can alter volume-control progression as well as response. A series resistor belongs in the capacitor branch and produces a different network; the two arrangements are not interchangeable just because the component values match.
The existing supported examples include 180 pF capacitor-only, 1 nF capacitor-only and 1 nF with 150 kΩ in parallel. These are comparison starting points from the existing tools, not newly invented universal recommendations. The Treble Bleed Designer provides more detailed exploration; inspect its declared topology and assumptions.
Pot taper, pickup and load still matter
A bleed network changes the effective circuit around the moving wiper, so the same components can behave differently with a different pot resistance or taper. Pickup inductance and resistance, cable capacitance and input resistance also affect the result. A recipe that works in one guitar is not evidence that it is optimal in every other guitar.
Compare like with like. Hold pickup selection, cable, input and control position constant for a circuit A/B. A matched-output listening comparison is useful too, but it answers a different question from a same-knob-position comparison. Do not confuse modelled voltage transfer with perceived loudness or the response of the complete amplifier and speaker.
Choose the smallest useful change
First decide whether you need the quieter setting to retain more high-frequency content, a different volume sweep or both. Compare no bleed with capacitor-only and RC options. Include low, middle and high volume settings and listen for an adjustment range that remains useful. There is no requirement to install a bleed in a circuit that already behaves as you want.
If the volume sweep is already the problem, changing the network can complicate diagnosis. Record the pot’s resistance and taper, establish a baseline without the bleed, then compare one network at a time.
Wire input to wiper, then inspect
Verify lug 3 as signal input and lug 2 as the wiper/output before adding the network. Physical left and right reverse with viewing orientation. Insulate exposed leads as needed and leave clearance around grounded casings and adjacent terminals. The normal output remains wiper/lug 2 → jack TIP; sleeve is the return connection.
Use the Designer to experiment, then the wiring reference for the actual supported layout. Component shopping comes after that decision: capacitance, resistance, tolerance, dimensions and assembly quality are the useful specifications. Avoid buying a network solely because a branded recipe promises to preserve an undefined perfect tone.