The LoZ impedance in most WW-II era Signal Corps sets is usually given as 250 ohms. Robert Downs … SCR-274-N "-B" Receivers: ES-691027 -> 4000 or 300 ohm nominal output impedance … Mike / KK5F -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.qth.net/pipermail/arc5/attachments/20190316/4b1d7b94/attachment.html>