DC REGULATED POWER SUPPLY FOR DIODE/TRIODE VALVE CHARACTERISTICS – GUPTA BRAND 200159 Posted on March 1, 2017May 2, 2017 by admin H.T. Voltage/Current : 0-300VDC/30 mA, Bias Voltage/Current : 0-15VDC/10 mA, L.T. Voltage/Current : 6.3VAC/1 Amp with 3 round meters