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That's what I'm thinking. Were they sitting up for a long time before you got them? Surprised there is no documentation on the web.
I looked around for info on a CVS 504 TBC and could find nothing. Those were VERY popular in the 70's-80's. It was the first digital TBC (digitally controlled glass delay lines). Consolidated Video Systems won an emmy when they came out in the 70's.
Hope you didn't pay too much for them.
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