VPI Magic Brick threads deleted

They were $35, when they came out (80’s).    Of, course; I only paid $19.95, for my first Audio Technica Safety-Raiser, too.     I got a DB-9 pair, when I bought my Cary monoblocks.    Probably: world’s singular easiest A/B listening test.      Especially efficacious, if your amp’s output and power transformers are in close proximity (magnetic flux/eddy currents/etc).     https://elusivedisc.com/vpi-magic-brick/      Stereophile reprinted their 1982 review: https://www.stereophile.com/content/vpi-magic-brick

 Inside a MAGIC BRICK
i dropped 1 of mine on the floor busted open.  inside of the wood case is 5 or 6
pieces of Steel Sandwiched fitted in.the case. now both mine have nice black tape around both of them 

Harry's reach is wide and deep.

On a non toroidal transformer this would likely increase the leakage inductance which is akin to putting another inductor in series with the transformer but likely not a very big one. For power supplies that could quiet them down but could add acoustic noise.  Toroids unlikely to do much. Output transformers it could hurt your high end.  If the product has a steel case less impact overall.