Here is a nicely done movie from the Techmoan Youtube Channel. We encourage you to check it out. He has two videos discussing the Seeburg 1000. This is video one of two. The link for video two follows below this post.
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Seeburg 1000 BGM Part 2: The DIY version
By Seeburg1000 on October 1, 2018 in BMS1
Here is Part Two from Retrotech’s Techmoan Youtube Channel which continues his informational video about the Seeburg 1000.