Pharmasonic SYS-700 VCF 703F

hey there, why no other company go after this special filter? it is really hard to recrate? From what I remember was made witthout any rare filter chip and can be recreated with equivalent components

No idea, why no one else as done it. It's a great filter. This uses some CA3080 chips, which aren't cheap, but in production. I'm sure it could be re-designed with more common OTAs.