Output Transformers KE57613-B

 

	This second generation special cored low leakage symmetrical wound KE57613-B tube output transformer prototype, which almost meets Williamson's specifications from 1947,
	KE57613-B, The Second Generation Output Transformer Prototype  has the following design parameters: Primary windings (50W): - 2X115V@20Hz (Imax=0.22A) Secondary winding: - U0=6.5V, Imax=5A Miscellaneous data: Dimensions/Weight: 52X100mm/1kg Total primary inductance: 45H@5V/50Hz Leakage inductance: 47mH (42kHz@KT66 p-p drive) Total primary DC resistance: 233Ohm Maximum power input: 50W@230V/20Hz Inductance vs DC unbalance:-   Which makes the transformer useful as for instance: - Standard Williamson OPT using push-pull KT66/807/6L6GC/EL34 drive with 8Ohm speaker load only (15Wsin@807). - Boosted Williamson OPT using push-pull KT88/6550/PX25/300B drive with 4-8Ohm load (Psqr@6550>30W, +/-30% Class AB if biased@6R). - Custom tapping at outermost secondary may however also be used but is not recommended. - May also even be used as mains isolation transformer for f.i tube preamps (<230V@0.2A, 13V@0A) KE57613-B, Independent OPT Test Results

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