Tauriq wrote: About a week back I switched on the amp and noticed this popping noise coming from the amp. It carried on for a while. Switched it off and on again and it was gone so I just ignored it hoping it was some one time issue.
It's done the same thing again so I'm hoping to rectify the problem.

Is this a case of new tubes or is it something only a tech can solve() ?

I think most amp problems are caused by dry solder joints. How old is the amp?

My suggestion is to get it to a tech for a checkup.

the classic 30's tend to overhead, due to the design all the hot air from the valves go directly into the pcb's in the amp. so as tom mentioned it is most probably a dry joint.

I know that when you leave the reverb up when switching the amp on, there is an audible popping sound... Try switching it on with the reverb and volume all the way down, then let it warm up for about a minute and then try. It should be fine... Atleast that's what I've heard.

korn101 wrote: I know that when you leave the reverb up when switching the amp on, there is an audible popping sound... Try switching it on with the reverb and volume all the way down, then let it warm up for about a minute and then try. It should be fine... Atleast that's what I've heard.

AFAIK that would just be a once-off pop as the amp is turned on... :-\

Is it just popping, or is there a sort of scratchy sound as well, kind of like someone rubbing a hand over a microphone? If there's that as well, it could be a case of the valves being on their last legs, and needing a change...

My bet is valves too

When did it happen? Straight after switch on? Or after a little bit?

1. since valves take long long time to wear out, either your amp is at fault for eating valves or it's not caused by worn valves at all;
2. you should always have a backup set of valves so you can easily check if it might actually be the valves.

Gearhead wrote: 1. since valves take long long time to wear out, either your amp is at fault for eating valves or it's not caused by worn valves at all;

True, but how old is the amp?

It could be something as simple as electricity. When I moved to a new house and plugged in my amp, I thought it got damaged in the move, but then I moved it to the opposite wall and the crackling was gone. If you have too many things plugged into the same outlet, an power extension chord coiled up or your amp against a wall where the power mains run through, it can all cause humming and crackling. move your amp around and see what happens.