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gobo gluing issue

I built myself three 4 ft x 6 ft gobos, each made from a framed piece of ¾ inch plywood, a layer of 1/8 inch high-mass vinyl, and three 2x4 batts of acoustical/fire rockwool. Each batt is wrapped first in light tracing paper to keep fibers in, then all the batts are wrapped in theatrical polyester muslin fabric, which is durable and fire-resistant, if not entirely acoustically transparent.

Orban 622B Parametric EQ

I was wondering if anyone could tell me a little about the Orban Parametric Eq model 622B ?
I have come across one which has come out of a broadcast facility in Oz. I really don't know much about these units.

With the age I'd expect it would require recapping, but I'm keen to know if anyone is familiar with or has used one in their travels and if its worth taking a look at.