I won a bid for a pair of capacitors the other day and in with them came these air core inductors I don't know what to do with them so thought I would ask here as there seems no limits to BH fountain of knowledge if they might be use for experimenting with on any of the BH kits, if not I will just list them.
2 off 3.1mh 1.0mm wire air core inductors
2 off 0.09mh 1.0mm wire air core inductors
2 off 0.08mh 1.0mm wire air core inductors
pic has a 12au7 in it for some scale