So my Randall RH150 keeps cracking and buzzing across all channels but it seems to stop when I flick and jiggle the tube. The underlying buzzing (to be considered a separate entity from the far more annoying crackling) also ceases when I touch the chassis, which made me think it's a grounding issue but really I don't know.
I've changed the tube and the input jack so I don't know what could be causing it to break up and crackle. Any advice? Help? Suggestions?
Thanks for stopping by
It sounds like you have a bad solder joint on the valve socket.
Does the valve go in easily? The pins can become slack if the valve is changed frequently.