Amazing patent vintage British mil. spec. barretter tubes manufactured in England by renowned Siemens. These ballast resistance tubes, equivalent to type 2G have 4 pins, thick mica internal support, and are printed in white CV1842 SIEMENS MADE IN ENGLAND PATENT BARRETTER TYPE 2G 15-40V. 100 MA. Boxes are brown military labelled VALVE ELECTRONIC CV1842... Amazing patent vintage British mil. spec. barretter...
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