I purchased my DSL40CR in Sept 2020. Its never left my bedroom, never been played particularly loud and (unfortunately) I have not had a lot of time to use it. The presence and resonance originally worked when I received the amp but now turning either of these two knobs has no effect.
Also there has always been an occasional, infrequent, weak 'crackle' noise. Is this a tube problem or is this normal for this amp?
Is there an 'easy' fix, like swapping tubes? Is that something I can do myself?
Please let me know what my options are.
We would always recommend the amp is looked at by an engineer.