Lot Of FOUR Used API 2521B VCA's w/Set Of Documents For DIY Projects Etc. SA

Description

Lot Of FOUR Used API 2521B VCA's w/Set Of Documents For DIY Projects Etc. These are very early VCA's that were designed by David Blackmer at API, before Mr. Blackmer founded dbx.
Untested and sold as is. I have no experience with using these VCA's and can't offer any help in using them for circuit design, but the included documentation shows the pinout and typical hookup, so it should be a good start.
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