Tube noise?

[dumstafication]

I have a triple rec. and the past couple of times I've played it, there has been some crackling.
I've noticed it in all 3 channels, but it's more noticable on channel 3.
Also, it's mostly when I have my guitar volume up, but when I'm not playing.....I've tried other guitars and cables...so that's not the problem.
I have replacement tubes, should I just change them all out or look for the one making the noise?
Also, I expected to have to replace the power tubes 1st, but it seems that it's probably the 12ax7s instead....is that unusual?
Any help is appreciated.

 

[stokes]

You can try "rocking" the tubes in the sockets one at a time.If you rock a tube and hear the crackling,it indicates a dirty or loose socket or bad connection on one or more of the pins.

 

[Timbre Wolf]

If it is in all three channels, you might look to the first input tube ("V1" which is the one closest to the guitar's 1/4" input). Swap it out for a known good one, and check if that helps. Stokes' idea is also a great one - keeps you from tossing out one that just has a slight pin disconnect.

- Thom

 

[dumstafication]

Much appreciated guys!