mhardy6647
Grand Contributor
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- Dec 12, 2019
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Variable output impedance was a "thing" a long, long time ago in hifi, for those who weren't aware of it.The advantage of these T+A amps is that only the output impedance can be changed and nothing else. I can't imagine a better UUT for this topic.
source: https://www.alliedcatalogs.com/flipbook/1959_allied_radio_catalog.html
UL listed, too!