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Power amp tube???
The first step is to verify that it’s not the speaker or speaker cable or the bass/cable itself. Then, try jumping the preamp out to power amp in jacks.
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The normal on the headphone out jack could be dirty. If it does not "normal) when nothing plugged into it, it will kill the audio to the amplifier section.I have a TX600 that has stopped working. With the gain up full I can get signal out but very quiet. No issue with DI or Line in, both work fine. I changed the power amp and pre amp tube to no avail. Any advice?