![]() Most valve amp manufacturers have a basic academic understanding of output trannys, but often have a limited or incorrect understanding of the physics of transformers or how they are made.Īcademic formulas for calculating the design of output trannys is available in many text books and web sites. ![]() Few people working in transformer winding companies have a knowledge of electronics or valve amps. Transformer winding is an extension of the fitting and turning industry. Valve amp manufacturers purchase trannys from transformer winding companies. Output trannys contribute most of the distortion in a valve amp and have a limited bandwidth. The two output trannys are rotated 90deg to the power mains tranny to avoid picking up induced hum from the mains tranny external magnetic field. The right pic shows a stereo Leak amplifier. The output transformer is the heart of a valve amplifier.
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