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three valves in a single envelope is that if one filament fails, the whole device becomes useless, but to counter this disadvantage, loewe offered a repair service to replace failed filaments. loewe later developed a more sophisticated multi-valve, the wg , which was enclosed in a metal shield, containing
version of nf, with outer coating partially removed, in the london science museum. loewe oe radio, deutsches museum , munich. base diagrams - hf, nf, wg circuit diagram of radio using nf , glass encapsulated capacitor and resistors as used in nf original advertisment. another multi-valve type device, containing...
http://www.electricstuff.co.uk/loewe.html