OK, I'm still suspecting some error related to wiring, test clips, something.
That old classic, balanced to unbalanced with the R of TRS floating rather than grounded. Something.
An A20 will not behave that way, nor do you have that many bad transformers.
That old classic, balanced to unbalanced with the R of TRS floating rather than grounded. Something.
An A20 will not behave that way, nor do you have that many bad transformers.