Tempco Resistors

[Kevin Lightner]

This may seem dumb, but as I once mentioned awhile back on AH, I have some
SEM's in an Oberheim 8 voice that do not have Q81's on a couple of VCO's.

Instead there is a resistor, a thermistor and another resistor.

One VCO is actually stable with this mod, the other drifts.

Is it possible to approximate the curve of a tempco by way of other
thermally sensetive components, like thermistors?

Are thermistors too inaccurate for this use generally?

Math wizards?

-Kevin