So i've had a Crate VC30 for a few years now and it desperately needs new tubes. Just recently I tried to use the effects loop for the first time since i've owned it and when I try to plug the cable into the jack, I get a loud, pulsating, snapping, buzzing noise that will not go away. Is this a cause of bad tubes or is there another possible reason for this to be happening?
how do you know it 'desperately needs new tubes'?

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