I recently bought a Marshall JMD 100 watt combo and it has 2 problems:
- It makes a loud hissing sound that get's louder by each preamp you select (from clean to high gain), which makes sense, but it really is a too loud hiss
- It makes another noise that I would compare with when you would be filming with a lot of wind. This one comes and goes and is not regular but almost always there.
When I use the headphones or the XLR out there is no noise so that would lead me to suspect the power tubes?
Am I right in suspecting the power tubes or could it also be something else?
Could I test this by pulling tubes one by one to find the faulty power tube or is there something else going on?
- It makes a loud hissing sound that get's louder by each preamp you select (from clean to high gain), which makes sense, but it really is a too loud hiss
- It makes another noise that I would compare with when you would be filming with a lot of wind. This one comes and goes and is not regular but almost always there.
When I use the headphones or the XLR out there is no noise so that would lead me to suspect the power tubes?
Am I right in suspecting the power tubes or could it also be something else?
Could I test this by pulling tubes one by one to find the faulty power tube or is there something else going on?
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