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Marconi R Valve

Marconi 'R' valve also known as the 'TM' radio repro tube Maximum Plate Voltage 180 V Maximum Plate Current 2 mA (Vf=4V,Vg=0V) Va 120 V Ia 1 mA Vg -0.5 V Transconductance 0.3 mA/V Filament Voltage 4 V (DC/AC) Filament Current 0.6 A