BX7-GT – Global fitting of General Electric plate characteristics

6BX7-GT – Original GE datasheet graph used for fitting

ALT: Original average plate characteristics graph of the 6BX7-GT from the General Electric datasheet, used as the source for digitization

Caption: Original page 4 graph from the General Electric 6BX7-GT datasheet. This figure was digitized to obtain the curve families used to build the mathematical model through fitting.

Description:

Original “Average Plate Characteristics” graph from page 4 of the General Electric 6BX7-GT datasheet. The chart shows plate current versus plate voltage for different grid-voltage values and is the graphical source from which the data used for digitization and model fitting were obtained.

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6BX7-GT – Global fit of GE plate characteristics

ALT: 6BX7-GT comparison between digitized General Electric plate-characteristic data and fitted model curves

Caption: Global fit of the 6BX7-GT using 440 points digitized from the General Electric datasheet. Circles represent digitized data; solid lines show the fitted model for grid voltages from 0 to −50 V.

Description:

Comparison between the eleven plate-characteristic curves digitized from page 4 of the General Electric 6BX7-GT datasheet and the globally fitted mathematical model. The dataset contains 440 points covering grid voltages from 0 to −50 V.

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6BX7-GT – Global fitting residuals

ALT: Residuals in milliamperes for the global 6BX7-GT fit across the eleven grid-voltage curves

Caption: Residuals of the 6BX7-GT fit, expressed in mA, for each of the eleven plate-characteristic curves digitized from the GE datasheet.

Description:

Absolute model error relative to the digitized data used for fitting. The graph reveals systematic residual patterns along each plate characteristic and allows comparison of model behavior at different grid voltages.

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6BX7-GT – Fitting parity plot

ALT: Parity plot comparing digitized GE datasheet plate current with the 6BX7-GT model prediction

Caption: Parity plot of the global 6BX7-GT fit. Each point compares plate current digitized from the GE datasheet with the model prediction; the diagonal represents ideal agreement.

Description:

Direct comparison between plate-current values digitized from page 4 of the General Electric datasheet and those predicted by the fitted model. Proximity to the diagonal provides a visual assessment of overall model agreement.

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6BX7-GT – Relative fitting residuals

ALT: Relative percentage error of the 6BX7-GT model across the eleven plate-characteristic curves used for fitting

Caption: Relative residuals of the 6BX7-GT fit, expressed as a percentage. Percentage errors become naturally more sensitive in regions where plate current is very small.

Description:

Relative percentage error between the model and the digitized GE datasheet data for all curves used in the fitting process. The graph particularly highlights low-current regions, where small absolute deviations can produce large percentage errors.

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6BX7-GT – Fitting RMSE by grid voltage

ALT: RMSE in milliamperes for the 6BX7-GT model grouped by grid voltage from -50 to 0 V

Caption: Fitting RMSE calculated separately for each 6BX7-GT plate-characteristic curve, from Vg = −50 V to Vg = 0 V.

Description:

Distribution of the model root-mean-square error across the eleven data families used in the global fit. The graph allows direct comparison of model accuracy at different grid voltages and shows that the error is not uniformly distributed among all characteristics.

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