Phil Allison wrote:


the steel band is very thin and quite seamless - it appears to be shrink fited onto the alloy drum. Nice bit of machining to make that from a steel tube.


** Forget that.

Info recently posted on the web (not there when I have me example on the bench) suggests the "band" is made from very fine wire, probably a Iron / Nickel alloy, wound onto the drum and then machined smooth.

http://www.effectrode.com/magnetic-d...memory-system/

BTW:

The wire cannot be "Constantan" cos like most resistance wire it is non magnetic.


.... Phil