What Reel To Reel machines did the Beatles use during the 60's

Reel to reel tape and 1960s hi-res stock photography and images - Alamy

Reel To Reel - Science Museum Blog

A fan's unique recordings of the Beatles won't be available online, because of “copyright issues” – Walled Culture

Back To My Reel-to-Reel Roots, Part Two – PS Audio

Back To My Reel-to-Reel Roots, Part Two – PS Audio

Reel ADT – Artificial Double Tracking Plugin - Waves Audio

1960's Reel Tape - Canada

Pre-Recorded Tape Reel vs Vinyl LP?s, Page 2