Roger's Mains Transformer KE77003-B

 

	The KE77003-B tube mains transformer, which is a modern version of Williamson's specifications from 1947.
	KE77003-B, Roger's Mains Transformer Primary windings (170VA): - 2X115V@50Hz (Imax=0.95A) Secondary windings: - 2X350V@0.15A (Imax=0.3A) - 4X3.15V@4A (Imax=4A) - 5V@3A (Imax=4A) Miscellaneous data: Dimensions/Weight: 57X120mm/1.5kg Total primary resistance: 7 Ohm Total HV secondary resistance: 86 Ohm Effective std rectifier drive impedance: 16+43=59 Ohm   Which makes the transformer useful as: - Standard Williamson mains transformer using RC-filtered silicon bridge rectification (440Vdc@0.15A, each channel). - Mains transformer using boosted Williamson configuration with KT88/6550 (somewhat lower dc & heater voltage) - A spare 5V/3A winding for optional nostalgic 5V4/GZ34 tube rectifier usage, 300B heating or logic supply. - Low cost alternative: 125USD KE77003-B, Taps

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