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Your tube has become microphonic and must be replaced. You have to
replace them in matched pairs, and have the amp biased
unfortunately.
--- In SurfGuitar101@y..., "Brian Neal" <bneal@z...> wrote:
> Hi, this is maybe slightly off topic...my tube amp is starting to
make a
> slightly metallic or glassy sounding rattle on certain notes (the A
string
> will usually do it, or if I fret a B on the 14th fret, A string). I
pushed
> an unsharpened pencil against the first power tube and it seemed to
stop.
> But it will also stop if I push my palm against the back panel. I
also
> tightened every screw I could find on and in the thing. Some of
them were
> very loose. But it still might be that tube. Any suggestions? Is
this what
> happens when tubes go bad? Can I just buy one power tube and
replace it?
> Thanks,
>
> Tube Novice,
>
> BN
