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That's true if the transformer is being driving by a high impedance tube circuit, where the tube AC output voltage can become very high when unloaded, but not when being driven by a low impedance transistor amp, whose AC voltage changes little from no load to full load.................
Just a word of caution, audio transformers need to be loaded and should not be run with open circuit secondaries, or excessive voltages may damage the insulation on the windings.
Good point cruts. ThxThat's true if the transformer is being driving by a high impedance tube circuit, where the tube AC output voltage can become very high when unloaded, but not when being driven by a low impedance transistor amp, whose AC voltage changes little from no load to full load.