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Old 1st Nov 2022, 10:55 pm   #58
Bazz4CQJ
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Join Date: Apr 2009
Location: Oxfordshire, UK.
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Default Re: Improving Selectivity In Vintage Receivers

I wonder how much the HRO was designed (in the early 30's) on engineering principles and how much on trial and error? That space between the coils is quite something!

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