We construct several AF output transformers based on results of this script, which including transformers for Mullard 7W and 10W power amplifiers, several 6N6C/6V6GT and 6L6G based power amplifiers, etc. Nominal load ratio is 8k0 : 4r0, 8r0, 16r0, with maximum 5 winding losses with each of the sec loads. Once supplied the input parameters this script provides a winding ratio, the number of turns required for primary and secondary winding and required copper wire gauges for both primary and secondary windings, etc. The script is available to download at google drive under the terms of GNU General Public License version 3.0. This " AF output transformer calculator" script is written using Python and it works with most of the commonly available Python interpreters. Whats quite nice is theres a calculator that allows you to design a single ended output stage. For homebrew projects, the best option is to construct those transformers by ourselves and this script helps to calculate winding parameters for those transformers. I have an old version of SE amp design software somewhere. Audio output transformers are heavily used in a vacuum tube and some (older) transistor base audio power amplifiers, but these days output transformer are quite hard to find and expensive item. Impedance Matching The impedance of the output stages of the amplifier circuits is often different from the impedance of the audio speakers.
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