Winding an output transformer for PL36 push pull

[ppppenguin]

Dominant pole is a perfectly good way of ensuring that an amp with NFB is stable. Unfortunately it needs a fair bit of spare bandwidth to work. If there's anything odd about the freuqncy and phase response above the wanted frequencies it's all too easy to get an oscillator, or at least a very underdamped loop. Refugee's last post, suggesting a high pass section in the feedback puts in a zero at some frequency above the wanted range to counteract such problems. If the forward path isn't utterly horrendous it's should always be possible to design a NFB loop that gives good results but it might need care and/or complexity.

Those of us who've mainly worked with DC coupled designs mustn't forget that the feedback will also have stability criteria at the low freuwncy end too. Again mainly due to the characteristics of the OP transformer.