6BX7-GT – Independent validation on GE page 3 plate characteristics

Original Average Plate Characteristics graph of the 6BX7-GT taken from the General Electric datasheet. This figure was used to digitize the curves employed in the first independent validation of the model, covering grid voltages from +5 V to −70 V.

Comparison between the plate characteristics digitized from the upper graph on page 3 of the General Electric 6BX7-GT datasheet and predictions from the mathematical model with frozen parameters. These data were not used during fitting and therefore provide an independent validation dataset.

Difference between the plate current predicted by the model and the data digitized from the GE datasheet in the first independent validation. The graph shows how the error varies along each characteristic and increases in some regions outside the fitting-data domain.

Direct comparison between plate-current values from the independent page 3 dataset and those predicted by the mathematical model. Dispersion from the diagonal makes regions of increased model error immediately visible.

Relative percentage error between model predictions and data digitized from the GE datasheet in the first independent validation. Large percentage values can occur even for moderate absolute errors when the reference plate current is close to zero.

Distribution of the model root-mean-square error across the different curve families in the independent page 3 dataset. The graph shows that accuracy is not uniform and that errors increase significantly under some conditions, particularly at the more positive grid voltages.