Dc blocking cap voltage

[bmaughan]

One thing to also consider is where the signal is coming and going. For example if you are using caps on an output you should consider the possibility that it may get plugged into a mic pre and may accidentally get phantom power applied. In that case you need to protect against +48V, so a 63V cap or higher might be appropriate.

Gotcha very true.
Not necessary on xfmr out correct? Since it won’t pass dc.. I know it can magnetize but..
Is it common to put a phantom blocking cap on the secondary of a transformer?

 

[john12ax7]

You don't need capacitors on the secondary of an output transformer.