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Author Message   Paul_ron Tinkerer Username: Paul_ron Post Number: 25 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Sunday, March 25, 2007 - 12:28 pm:    It seems these enlarger heads have the same problem with a Vactrol # VLT9B8 that isn't manufactured anymore. Bessler isn't supporting this head anymore either and has nothing to offer as a replacement. Someone on APUG had an electronics person look over the scematics and found that an Alied Electronics Perkin Elmer # VTL 5C3 works in it's place. I have a copy of the scematics since Besseler doesn't have em on file anymore in case anyone may have the same problem they can have the plans with some searching. e-mail me for a copy.