There have been many questions asked about oscillation in tube amps. These have been scattered across so many different threads that the search engine can't find them all. I am starting this thread to collect the thoughts in one place.
I am doing this because I was searching for something else last week and I found an old thread where someone had asked me how I check for oscillation. I realized that I never saw that question so I posted the answer, but the original poster may have not seen it since the question was buried in a non related thread.
Now I am working on some new circuits and I captured an oscillitory gremlin hiding in my amp. It is the evil hard to catch kind. I have not found the cause yet, and with my current work schedule, it might take a couple of weeks.
I am copying the original questions and answers in the next post.
I am doing this because I was searching for something else last week and I found an old thread where someone had asked me how I check for oscillation. I realized that I never saw that question so I posted the answer, but the original poster may have not seen it since the question was buried in a non related thread.
Now I am working on some new circuits and I captured an oscillitory gremlin hiding in my amp. It is the evil hard to catch kind. I have not found the cause yet, and with my current work schedule, it might take a couple of weeks.
I am copying the original questions and answers in the next post.