My DT50 212 has a prominent hum, even when no guitar is plugged in. It is not affected by the master volume level. It changes level slightly when using different voicings, but is quite loud in all of them. A tech listened to it and said that it is somewhat higher pitched than a 60 cycle hum.
It has always hummed and been noisy, but it was not such a problem in a band setting. Now I would like to use it more for recording and it has become quite a problem, as the noise floor is very high.
I have experimented with one or two different 12AX7 tubes in the past with not much difference that I could tell. I have not tried a Mesa SPAX7 as has been suggested in other posts.
I have opened a support ticket, but any help/guidance/info from the forum would be greatly appreciated. Thanks so much!
