Build a Doerle Twinplex with a single 19, details are here: http://www.bignick.net/images/RadioPix/TwinPlex.pdf and http://www.bignick.net/TubeRadio.htm
TJ Lindsay published a reprint of the Doerle Twinplex book some years ago which is now unfortunately out of print. Worth having IMHO.
TJ Lindsay published a reprint of the Doerle Twinplex book some years ago which is now unfortunately out of print. Worth having IMHO.
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