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RE: red plates ... bob and weave ...

There is nothing wrong with the Magnequest if it was a cheaper transformer (maybe a little more expensive than an Edcore). Or there is nothing wrong with an expensive amplifier if they also used a special quality transformer.
The advertisement was originally for a $18000 amplifier (ok, a silly price) but even $4000 is way too expensive if we look at the components used and or the technology used (no real dc-coupled amplifier)

For the Magnequest, it is EI laminates, probably M6 grade 0.35mm. That's the quality of 1960. Nowadays we have M4..M3..M2..M0 and even better than that. Also EI laminates are not very good, we have C cores. The thickness of the lamination of standard high quality c-cores is much thinner, so we have less eddy currents in the core.
For specials we also have old-fashioned Permalloy but that too is pre-historic. We now have Amorphous and nanocrystalline cores.

And I've been working with amorphous cores for over 30 years so people here are asleep......

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