[sdiy] Magnetic interference: opinions ???

[jh.]

> 1) Shield the receiver
> 2) Sheild the sources

Magnetic shielding is not easy.

> 3) change the AC power supplies to offboard units or other types (toroid
> ???)

Toroidal transformers can work wonders. Especially when the original
transformers are particularly bad:

> The power supplies in question are potted brick supplies +/- 15V @ 100mA
> made by Intronics  (new old stock... 20 years ???)

Don't know about Intronics, but I have never seen a brick shaped (pcb mount
?)
transformer that would not cause ecessive stray fields. Replaced a lot of
these,
always with dramatical improovement.

JH.