![]() ![]() The leakage inductance is about 400uH and the transformer has a overall bandwidth of more than 150kHz. The third winding is for regulated screen grid voltage to the two pairs of EL86.The primary impedance of the transformer is 3 x 720 ohms which represents an anode to anode load for each EL86 of 5.8k. The corner stone (or what ever I should call it) in this amplifier is the trifilar wound output transformer. ![]() Some more theoretical analyses of class AB amplifiers and notch distortion was done by Pen-Tung Sah some years previous to that in his paper "Quasi Transients in class B audio frequency push-pull amplifiers" The original work, description and analyse is found in a paper called "Description and Analyse of a New 50-Watt Amplifier Circuit". This is an implementation of Frank McIntosh’s unity coupled output stage. ![]()
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