> Futurlec is a source of LM394's and they are much cheaper thenYes, and for a reason. SSM2210's are better.
> SSM2210's.
Also note that Futurlec sells the cheap DIP version (not the better
matched metal cans) and they are NOS (the ones I got are almost
20 years old).
The SSM2210 does make a better tracking VCO. But it's your
choice ;-)