I don't know if Commodore collectors in general care much about Victor computers. After all they were two different companies having Chuck Peddle and the Swedish distributor Datatronic in common.
But anyway, I wonder if your monitor is truly MDA or uses a different sync frequency? I have an amber Victor monochrome monitor that yield no output at all when connected to my friend's Sinclair PC200. It may have been set to CGA mode though, but we tried an IBM 515X MDA monitor at the same session, and it worked with the Sinclair. I thought the Victor monitor was simply broken until earlier this week when I connected it to my new Victor "Vicky" 8088.