Tag: nonlinear fitting

Cover image for an article about the Koren model for triodes, showing a vacuum tube, the model equation, and a family of anode characteristic curves.

The Koren triode model: theory, parameters and limitations

Written by giux | Published on Sep 12, 2026 | No comments

A study of the Koren triode model: equations, parameter meaning, limitations, 6BX7-GT fitting and independent LTspice validation.

#6BX7-GT #characteristic curves #GX-TXT #Koren model #LTspice #nonlinear fitting #Norman Koren #SPICE #triodes #vacuum tubes

Side view of a 6SN7 octal twin triode with the two internal tube sections visible.

From datasheet to SPICE model: Koren fitting of the 6BX7-GT

Written by giux | Published on Sep 11, 2026 | No comments

From the 6BX7-GT datasheet to a SPICE model: Koren equations, global fitting, parameters, residuals, metrics, and model limits.

#6BX7-GT #characteristic curves #GX-TXT #Koren model #lsqnonlin #ngspice #nonlinear fitting #Octave #SPICE #triode model #vacuum tubes