Thanks George! Interesting read.
I clicked on a link within the post that attempts to tout the benefits of an Autoformer; essentially better matching to speakers with different impedance values. Ie 4 ohm taps to 4 ohm speakers, etc. All well and good for “nominal impedance”.
But what about speakers with impedance swings all over the place, from 3 ohms to off the charts well at well over 20 ohms like 802D3s (nominally 8ohms). It’s swings like this that tax the best tube amps with their transformer outputs. How, exactly, do these impedance swings effect autoformers???
Are the electrical properties of autoformers similar enough to those of tube output transformers to cause similar issues when driving speakers with crazy impedance and phase curves?
I clicked on a link within the post that attempts to tout the benefits of an Autoformer; essentially better matching to speakers with different impedance values. Ie 4 ohm taps to 4 ohm speakers, etc. All well and good for “nominal impedance”.
But what about speakers with impedance swings all over the place, from 3 ohms to off the charts well at well over 20 ohms like 802D3s (nominally 8ohms). It’s swings like this that tax the best tube amps with their transformer outputs. How, exactly, do these impedance swings effect autoformers???
Are the electrical properties of autoformers similar enough to those of tube output transformers to cause similar issues when driving speakers with crazy impedance and phase curves?