I was just using someone else's guitar and it stopped working. I'm not sure if something I did damaged it
It was some kind of tube amp.
The signal was: guitar -> amp -> amp effect send -> input on audio interface -> laptop -> daw (intending to add a software reverb) -> audio interface send -> amp effect return -> amp speaker.
The speaker on the amp remained plugged in at all times. The input I used on the audio interface was the hi z, which may not have been the right one actually. But I would assume that would only affect the audio interface, if anything, (maybe audio quality) and not the amp?
The amp was seemingly working at first. After I did the above I was getting no sound. I tested it a bit afterwards, with just straight guitar -> amp and was getting nothing. Sometimes I would get some sound and then it would go away again.
Did anything I did have the potential to have killed this amp? It looked like an obscure amp which hadn't seen much use in a while.