You're looking for a free download of the Avalon VT-737 plugin. Here's some information about this plugin:
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: A versatile free parametric EQ that can be used to recreate the 32k "Air Band" sparkle of the Avalon. Sage Audio 3. Key Features of the VT-737sp
Avalon VT-737sp is a legendary vacuum tube channel strip, and while there is no official permanent "free download," you can access its official software emulation through a 14-day free trial Universal Audio
