Electron tube STR75/60 RFT is a voltage regulator 75 - 81V (measured at current 30mA). Allowed current range: 2-60mA. Operating temperature range: -55°C až +90°C. STR75/60 is a direct replacement for the 75C1 and GD75P stabilizers. New in box. All available pieces are tested with RoeTest V10 (samples are in the gallery).