6S19P.i6 power regulator triode
Thus tube was intended as the actuator for regulated power supplies. This explains why the curves of this tube show a large temperature dependancy - this was simply not important, as this was anyway compensated by the control loop!
i6-version
It is not only the hot plate, that makes the curves of my i6 model different to its forrunner. Through a deep discussion on hifi-forum.de, it was found that my golden sample used for the i5 was a sample from a bad quality batch. It suffers under a very strong island effect, and furthermore a (relatively small) section of the cathode is not covered by the grid, resulting in a part of the plate current which can't be suppressed with the grid. Both reasons forced me to create a new i6 model, based on a better sample, which I got from a colleague.
The achieved fit quality is, to be honest, below the usual level of my models. I have no clue why this time the fitting was so difficult. However, it is still worth to be provided - as it is still much closer to real curves of a good 6S19P sample, than my old i5 is.
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