![]() ![]() So, that "50 watt SE OPT" from Eastern Audio that weighs 5 pounds is like most other 5 pound transformers, a true 8 to 10 watt OPT. This is pretty useless for approximating performance with music. Many output transformers (especially the Chinese ones found on Ebay) are specified at 1000 Hz. If I had only one ruler to measure OPT performance it would be weight. ![]() The unfortunate truth of the OPT puzzle is that size really does matter, and the cost / performance curve is pretty constant with a very few outliers. This means a bigger physical size, more iron and copper, and therefore more money. The lower frequencies require more metal in the core and more windings to provide enough inductance. The power handling capability of an output transformer is not constant over the audio frequency range. Many state the facts, but they are not fully understood, and some just flat out lie! There is no real standard for specifying the power handling capabilities of an output transformer. The problem lies with the way many transformer vendors rate the power capability of their transformers. I will attempt to explain where much of the confusion comes from with regard to output transformers and their power ratings: For now it may look like a random collection of thoughts related to OPT’s. ![]()
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