I have a Roland Blues Cube 60. The amp works perfectly when it is first turned on, but then as if by a function of how hard it is driven and how long it has been on it develops a ticking sound reminiscent of a playing card against the spokes of a bicycle wheel. The sound of the guitar can still be clearly heard as well as the ticking noise.

The cadence of this tick changes based up on the attack of notes played. It also occurs in both preamp channels as well as if the guitar is fed just to the power amp via the effects return.

The guaranteed way to cause the ticking is to hit a 6th string 5th fret or a 5th string 7th fret harmonic. As the note decays the ticking slows and then abruptly disappears.

Any and all help is appreciated.

Thanks,

- Grady