possible tempco with KTY81

[Haible Juergen]

	>metalls get nonlinear (light bulb), but this is of course out of
our
	>region of interest (with exception of stage light, where
incandescent
	>lamps are always pre-heated, to avoid "cold current", which can be
10x
	>normal current).

I think the EMS VCS3 also does this. (indicator lamp for trapezoid)

JH.