<html><body><div><a href="https://www.youtube.com/watch?v=7Lh4CMz_Z6M" data-mce-href="https://www.youtube.com/watch?v=7Lh4CMz_Z6M">https://www.youtube.com/watch?v=7Lh4CMz_Z6M</a><br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Great video! Just watched this video on YouTube.<br data-mce-bogus="1"></div><div>The gentleman does some work on a lathe to make new brushes for the reel drive system.<br data-mce-bogus="1"></div><div>Very interesting stuff... at least it's from the era of Quad.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>My question: Did IBM engineer the mechanicals themselves, or were they farmed out to other companies?<br data-mce-bogus="1"></div><div>You see vacuum columns on this drive that later made it to the AVR-1 and the ACR-25.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Now I need to find out who invented the vacuum column...<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Scott Thomas<br data-mce-bogus="1"></div></body></html>