. Price list of wireless apparatus supplies and literature. . MT5 Valve Catalogue No. 220 The MT5 Valve operates with afilament voltage of 6, filament amperageof , and plate voltage of from 500to 1,500. The estimated life is 1,000hours. MT5 Valve Mount Catalogue No. 231. The neat mount in this illustration issupporting a Marconi MT5 25 watttube. (Three prongs.). NOTICE The Q valve isnow replaced by anew type, known asthe Qx. Thenew valve is similarin appearance to the V24. It operateswith a filament vol-tage of 5, amperageof .75, plate voltageof from 25 (rectify-ing) to 100 (ampli-fying) .

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