I have played Shadows tunes since the late 60's and in the early 80's I had a very successful Shadows cover band in Switzerland. However, when EMI offered us a record contract, we composed and recorded our own guitar tunes. I even met Hank Marvin during a TV shoot in Germany and spent some (at least for me) precious time talking to him at length. He was my idol! After all, I learned to play guitar with his music. But back to the actual reason why I'm writing this message.
I've had many echo / delay units in my long career, but a few months ago, I found a unit that can actually produce the type of delay you need for the intro of "Atlantis", or the muted sections in "Wonderful Land" or "Peace Pipe". The unit is the "El Capistan" by Strymon. While Hank has changed his delay units a number of times, this is the closest to perfect I've ever come in reproducing most of Hank's guitar sounds. Here is the link to the manufacturer's website: http://www.strymon.net/products/elcapistan/
Besides the usual knobs for Time, Mix, Repeats, etc., there are also two little switches, one for the Tape Head setting and one for Mode. For the "Atlantis" intro type of echo, or the muted part in "Peace Pipe", I set the Tape head to "Multi", and the Mode to "B", then I turn the Time knob to a fast speed, matching the original sound from the record. For something like "Apache", Shadoogie" or "Kon-Tiki" I set the Head to Fixed and leave the Mode on B. If you're serious about playing Shadows tunes, you should give this unit a try! No, I'm not getting anything out of this 'promotion', I just want to give younger players a head start in getting a good echo unit.