Lundahl strap change

[Bas Horneman]

Has anyone noticed how a couple of years ago Lundahl changed from a ferrous to non-ferrous strap. Personally without science to back me up I always thought the ferrous strap not a good idea. Lundahl must have thought so too. I'm assuming they must have had a reason. Anyone know why they did it? I don't recall it ever being mentioned anywhere. Or perhaps any other anecdotes on shrouds etc.

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[Bas Horneman]

Anecdote by someone on a post by me on a Facebook page:

There is actually a lot of issues caused by the magnetic shrouds and chassis. I was recently told by Jack Elliano of Electraprint transformers that the old school method of doing horizontal transformers caused untold issues from the core flux coupling with the steel chassis that was parallel to the core in that configuration. Apparently designers never really thought much about it until fairly recently it was standard build practice in consumer electronics and guitar amps. Bud Purvine was advocating non magnetic screws 20+ years ago as well.

 

[Bas Horneman]

Magnequest was also aware of this....it seems. They/Mike used copper. Magnequest TL 404