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Re: Ikin Norton 9 dB preamp tested with several transistors


 

On Sat, Nov 2, 2024 at 03:42 PM, Steve Ratzlaff wrote:
The -73 material is conductive
Rule of thumb:
Uncoated manganese-zinc Mn/Zn ferrites (#73, #77 ) with high permeability are conductive.
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Nickel-Zinc ferrites Ni/Zn (#43,? #61, 4C65) with lower permeability are isolators.
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regards, fred

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