Struct VariMuTriodeRoot 

pub struct VariMuTriodeRoot {
    pub model: VariMuModel,
    /* private fields */
}

Variable-mu triode nonlinear root for WDF trees.

Models the plate-cathode path as a nonlinear element controlled by an external grid-cathode voltage Vgk. Uses Newton-Raphson to solve the implicit WDF constraint equation.

Unlike the standard Koren-based TriodeRoot, this uses the Raffensperger equation which captures the variable-mu characteristic: transconductance decreases smoothly as Vgk becomes more negative, providing the gradual gain reduction that defines variable-mu compressor behavior.

Fields

model: VariMuModel

Implementations

impl VariMuTriodeRoot

pub fn new(model: VariMuModel) -> VariMuTriodeRoot

pub fn new_with_v_max(model: VariMuModel, v_max: f64) -> VariMuTriodeRoot

Create a variable-mu triode root with a specific supply voltage (B+).

pub fn with_parallel_count(self, count: usize) -> VariMuTriodeRoot

Set the number of parallel tubes for current scaling.

pub fn set_v_max(&mut self, v_max: f64)

Set the maximum plate voltage (B+ supply rail).

pub fn v_max(&self) -> f64

Get the current v_max setting.

pub fn parallel_count(&self) -> usize

pub fn set_bias(&mut self, vgk_bias: f64)

Set the DC bias operating point from circuit analysis.

pub fn vgk_bias(&self) -> f64

Get the DC bias operating point.

pub fn set_vgk(&mut self, vgk: f64)

Set the grid-cathode voltage (external control from bias, signal, LFO).

pub fn vgk(&self) -> f64

Get current grid-cathode voltage.

pub fn plate_current(&self, vak: f64) -> f64

Compute plate current using the Raffensperger equation.

Ia = p1 × Vak^p2 / ((p3 - p4×Vgk)^p5 × (p6 + exp(p7×Vak - p8×Vgk)))

Guards:

• Vak ≤ 0: no reverse current
• p3 - p4*Vgk ≤ 0: past cutoff (only at Vgk > +5V for 6386 params)
• Exp argument clamped to ±500 for overflow safety

Trait Implementations

impl Clone for VariMuTriodeRoot

fn clone(&self) -> VariMuTriodeRoot

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for VariMuTriodeRoot

impl Debug for VariMuTriodeRoot

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl NlDeviceIv for VariMuTriodeRoot

fn iv(&self, v: f64) -> (f64, f64)

Return (current, d_current/d_voltage) at the given port voltage.

fn v_clamp(&self) -> (f64, f64)

Return (v_min, v_max) voltage clamping bounds for this device.

impl WdfRoot for VariMuTriodeRoot

fn process(&mut self, a: f64, rp: f64) -> f64

Variable-mu triode plate-cathode path: i = Ia(Vak, Vgk)