On Tue, Nov 2, 2010 at 4:38 PM, Jim Brown <jim@audiosystemsgroup.com> wrote:
> On 11/2/2010 1:07 PM, Howard Lester wrote:
>
>
> > And yes, the Amidon ferrites I bought long ago were FT-240's.
>
> They are NOT Amidon ferrites, they are Fair-Rite toroids, with a VERY
> high markup added by Amidon. AND the cores you bought from Amidon are
> almost certainly not #31. The wholesale cost of these cores is about
> $4 in lots of 100 or more. Last I heard, Amidon and other ham vendors
> were selling them for something like $15. Not a fair price.
>
> Appendix One of that tutorial includes advice about how and where to buy
> ferrites and which ones to buy.
I should have been explicit: the type 73 or 77 (I forget) toroids I cited
earlier are those I bought FROM Amidon long ago... and "long ago" means some
17 years ago when it was commonly recommended to buy type 73 or 77 for HF
use. This was, presumably, long before #31 was produced.
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