Greetings all,
I'm checking out a Fender Blues Deluxe for a friend - this is the second time I've taken this beast on for him.
The original complaint (this time) was that it has a very subtle "distortion/buzz" on the "finish" of certain notes. Very subtle, but irritating, if you listen for it.
However, as I began troubleshooting it, I noticed that the amp was kind of making an odd intermittent hum/noise. I thought it might be a microphonic tube, and when I began tapping on V2 it sent the entire amp into a solid oscillation that sounds a lot like, well, a sine wave test signal. Swapping out tubes has no effect, nor does turning the volumes up or down. I can feel the vibration in the power tubes as well as through the top of the cabinet. I can somewhat stop the oscillation by tapping on the cabinet top or by exerting pressure on it.
Suggestions?
Thanks in advance,
Fred G.
I'm checking out a Fender Blues Deluxe for a friend - this is the second time I've taken this beast on for him.
The original complaint (this time) was that it has a very subtle "distortion/buzz" on the "finish" of certain notes. Very subtle, but irritating, if you listen for it.
However, as I began troubleshooting it, I noticed that the amp was kind of making an odd intermittent hum/noise. I thought it might be a microphonic tube, and when I began tapping on V2 it sent the entire amp into a solid oscillation that sounds a lot like, well, a sine wave test signal. Swapping out tubes has no effect, nor does turning the volumes up or down. I can feel the vibration in the power tubes as well as through the top of the cabinet. I can somewhat stop the oscillation by tapping on the cabinet top or by exerting pressure on it.
Suggestions?
Thanks in advance,
Fred G.
Comment