Sophia Electric tube quality


I wonder if others have experienced poor quality with the Royal Princess 300b tubes. Purchased a new pair and one shorted out in a couple of months in their amp. Sophia replaced it and the new pair were extremely microphonic -- rang like bells when tapped with just my thumbnail. Sophia's response to my complaint was, "Stop tapping the tubes.
wfowenmd

Showing 1 response by psag

I estimate something like a thousand hours on mine, and they've performed flawlessly. They are about 5 years old.