[ARC5] QRP Ops

[Dave Rossetti]

Most of the 12XYZ tubes (12AX7, 12AU7, 12AT7, etc.) have a center tapped filament, which may allow for transmit/receive functionality.

⁣Dave Rossetti
410-279-0226 mobile ​

On Dec 6, 2024, 8:22 PM, at 8:22 PM, Hubert Miller <kargo_cult at msn.com> wrote:
>
>
>
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>Sent from my Galaxy
>I think maybe the 3A5 is unique in the separate filaments. The 12xyz
>tubes have the one filament heat both cathodes, isn't that right ?
>The QST article, maybe 1940, used a triode - pentode. Of course, the
>pentode section becomes the receiver.
>This makes me remember a Hallicrafters novice radio where the ? 35L6 ?
>switched from audio out to crystal oscillator. Also the "Mighty Mite"
>another beginner set with a dual use ? 35L6? output tube. I have only
>heard of one Mite existing.
>-Hue Miller
>
>
>
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