Crackling/poor Quality Distortion (amp Help) Options

[Iron King]

Hey guys,

I haven't used my JCM 2000 in a bit, but yesterday I plugged it in to test my new guitar (Gibson SG Standard).

When I went into the gain channel the it sounded extremely crackly. I'm not sure how to describe it but it definitely was not the heavy distortion sound we know from Marshall. I'm thinking I need to replace the tubes, but the the clean channel sounds pretty good. That's why I'm hesitant on spending money for new tubes.

anyone encountered something like this before?

thanks

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