Informational sites about crystals.
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History of the company that invented and patented the overtone crystal, etch-to-frequency and variable crystals. Source for ads, engineering bulletins, patents and manuals.
FT243 information compiled by Paul Carreiro, N6EV.
From N6EV. Tube oscillator schematics, and discussion.
FT243 information compiled by Paul Carreiro, N6EV.
History of the company that invented and patented the overtone crystal, etch-to-frequency and variable crystals. Source for ads, engineering bulletins, patents and manuals.
From N6EV. Tube oscillator schematics, and discussion.
