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WR50 is direct-heated type thorium tungsten cathode triode, can be used as class A1 and AB1 amplification.
Typical operating parameter
Heater voltage 7.5 V
Heater current 1.25A
Grid voltage -63 V
Ia 45 Ma
Internal resistance 4.1K
Amplification coefficient 3.8
Output power 2.4W
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PSVANE tube have 1 year guarantee