Vacuum tube VCO with expo control.

jhaible jhaible at
Tue Nov 23 12:56:40 CET 1999

>As the thresholds will only change the linear mA/Hz scale factor of the CCO
>(which ideally should go straight thru the origin) any ageing of the neon
>tube should only result in a pitch shift. Current doubling still means
>frequency doubling.

Yes, that's the big advantage of V/Hz VCOs. Even when they drift, you just
have to slightly re-tune them, like a guitar string. (If you have to adjust
scale factor, that's more like redesigning the fretboard, to stay with the
guitar analogy.)


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