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@ClaraListensprechen@universeodon.com @Ralph058 @SrRochardBunson @sergio_101 I remember those too. Acorn tubes. They were rare outside of things like missile guidance systems.
@ClaraListensprechen@universeodon.com @Ralph058 @SrRochardBunson @sergio_101 I remember those too. Acorn tubes. They were rare outside of things like missile guidance systems.
@shuttersparks @ClaraListensprechen @SrRochardBunson @sergio_101 I had a grid dip meter kit that used one and a 3/4 meter transceiver.