> The
reason is quite simple--tungsten-filament lamps (not that I
> expect anyone to have any carbon-filament ones) have a very steep
> resistance-temperature curve (higher "hot" resistance).
HP remembered this.
Indeed they did. In the Mdoel 200 Audio Oscillator for one thing ;-)
I am sure it's mentioned in one of Fred Terman's books too, not
suprisingly...
-tony