Topband: re: Ultralinear amps

[Rick Karlquist]

>The Nov 21 1994 issue of DXnews has an article titled "Ultralinear
>2N5109 and=20 2N3053 Amplifiers". Back issues or copies of the article may
>still be available from the NRC. http://www.nrcdxas.org/catalog/  
>Articles A87, A88
>These amplifiers known as common base transformer feedback (CBTF) or
>common base noiseless feedback (CBNF)  were first described in May, 1976
>MICROWAVE JOURNAL.

If you look in the Anzac catalog at the AM-123 amplifier, it cites a patent
(long since expired) that protects it.  I have read the patent and it goes
into so much detail it is practically a contruction article.  The amplifier
uses a 2N5109 with input and output transformers providing noiseless feedback.  
The AM-123 has excellent distortion and noise characteristics.

Rick Karlquist N6RK




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