After much discussion on the forum about core size and material, the conclusion I have come to is; as long as it is ferrite and of a similar dimension it will be OK to try out.
Romero stated his cores, for the device shown, are 6mm dia x 15mm long.
As I have some blank AM radio ferrite rods to hand I have decided to go with these as a first-try core. I have 10mm(with small flats either side of 8mm) dia x 15mm long.
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