Coil question for TA2020, 2021(to Jan Peter?)

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Jan Peter makes clear that a toroid or air coil is not the best for the coils. He uses nice shielded flatwire coils in the Hypex modules.
Is there any source for this type of coil to be used in TA2020 or 2021 like the Charlize or 41Hz Amp3 or Amp6 that outperforms their standard coil?
Thx, Rick
Happy Christmas and new year
 
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