Pro Audio Design Forum

THAT no longer makes the retrofit 202 modules, but they do make similar vca chips to 2018. Actually the SSM2018 is going out of production at the end of the year. The 2018 modules I have built for the MCI application have around .007% distortion at 1K @ 0db. The old DBX202 has .4%. Thanks again for ...

I had read that diodes were implemented with the original DBX 202 to help control "thumps" when un-muting the vca.

Thanks much for your reply and knowledge.

At the original vca (202) there is no resistor from the control port to ground. On the upgrade design there is a R to ground (R5) which was 374 ohm. I removed that initially for this project.

What's the purpose of the 2 op-amp arrangement at U3 A/B and at U1 C/D with the diode?

I'm working on a Sphere Eclipse C console that uses the DBX Black Can 202 VCA modules with the -6mv/db control law. I'm upgrading to a design that uses the SSM2018 vca. The modules that I want to use on the upgrade use the 2018 vcas that were designed in the '90s to replace the DBX 202C Gold Can mod...