DC Power Supply for Western Electric 555 driver.
Above two photographs are the DC power supply for Western Electric 555 driver. Above is built by Tungar bulbs and below is built by selenium rectifier. The WE 555 driver is worked at DC 7 volts, 1.5 amperes respectively. So total electric consumption by a pair of WE 555 drivers are 3.0 amperes at DC 7 volts. In addition to that, a pair of tweeter WE 597 needs 2.4 amperes more at the same DC 7 volts. The two kinds of DC power supply I built can supply average 6 amperes and is designed to endure up to 8 amperes electrically and be adjustable voltage between 6 and 8 volts.