6BX7-GT – SPICE validation on GE page 3 transfer characteristics

6BX7-GT – Second independent validation of the SPICE model

ALT: Comparison between digitized General Electric datasheet data and the 6BX7-GT SPICE model in the second independent validation

Caption: Second independent validation of the 6BX7-GT. Data digitized from the GE datasheet are compared with the SPICE model and the corresponding analytical model; circles and crosses distinguish in-domain and out-of-domain points respectively.

Description:

Comparison between the second independent dataset derived from the lower graph on page 3 of the General Electric datasheet and the response of the 6BX7-GT SPICE model. Plate current is plotted versus grid voltage at constant plate voltages of 100, 200, 300, 400 and 500 V. Model parameters remain frozen from the original fitting.

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6BX7-GT – Residuals of the second independent SPICE validation

ALT: Residuals between the SPICE model and digitized GE datasheet data in the second independent validation of the 6BX7-GT

Caption: Residuals of the second independent validation of the 6BX7-GT. The graph shows the difference between the SPICE model and data digitized from the GE datasheet, distinguishing in-domain from out-of-domain points.

Description:

Residual plot comparing plate current predicted by the SPICE model with the second independent dataset derived from the General Electric datasheet. The five families correspond to plate voltages of 100, 200, 300, 400 and 500 V; symbols distinguish interpolation from extrapolation relative to the training domain.

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6BX7-GT – Domain map of the second independent validation

ALT: Second independent validation points of the 6BX7-GT classified against the fitting domain in the Va-Vg plane

Caption: Map of the second validation dataset in the Va–Vg plane. The blue boundary represents the training domain; circles indicate in-domain points and crosses indicate out-of-domain points.

Description:

Representation of points digitized from the lower graph on page 3 of the GE datasheet relative to the model input domain. The five vertical groups correspond to Va = 100, 200, 300, 400 and 500 V and identify interpolation and extrapolation regions.

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6BX7-GT – Overlay of analytical and SPICE models

ALT: Overlay comparison between analytical-model curves and SPICE-subcircuit curves for the 6BX7-GT

Caption: Direct comparison between the analytical and SPICE implementations of the 6BX7-GT. The curves are practically indistinguishable because the SPICE translation reproduces the mathematical model within numerical precision.

Description:

Overlay of curves generated by the mathematical 6BX7-GT model and by the SPICE subcircuit derived from the same law. Their near-complete overlap confirms that the SPICE conversion introduces no appreciable discrepancy.

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6BX7-GT – Residuals between SPICE and analytical models

ALT: Numerical residuals between the 6BX7-GT SPICE subcircuit and analytical model

Caption: Difference between the 6BX7-GT SPICE and analytical models. Residuals are on the order of 10⁻¹³ mA and are therefore consistent with numerical precision.

Description:

Residual plot obtained by subtracting the analytical prediction from the current calculated by the SPICE subcircuit. The 10⁻¹³ mA scale shows that the two implementations are numerically equivalent for practical purposes.

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6BX7-GT – Parity plot between analytical and SPICE models

ALT: Point-by-point parity plot between the mathematical model and the SPICE model of the 6BX7-GT

Caption: Parity plot comparing the analytical and SPICE models of the 6BX7-GT. Points coincide with the ideal diagonal, confirming the numerical correctness of the SPICE translation.

Description:

Point-by-point comparison between predictions from the mathematical formulation and those from the SPICE subcircuit. Alignment along the diagonal shows that the SPICE implementation reproduces the analytical law within numerical precision.

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