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Post by jim on Sept 25, 2005 21:32:54 GMT -5
on the dirty channel, gain at 5, I get a hum out of the cab., if your playing you dont hear it but, when not playing, volume off on guitar,floor tuner off to cut signal,still hums, switch to clean chan. ,no hum,turn effect loop on or off still hums on dirty chan.! Is it the nature of th amp, are the tubes going? what do you think?
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Post by Jerry P on Sept 26, 2005 8:24:43 GMT -5
The 5150 does make a hiss noise when you turn the gain up, that just comes with the territory of high gain. If it's a hum them you may have some other problem. Check all your cables and guitar first. Try it with no effects. If it still hums you may have mismatched power tubes, old power tubes, a bad screen grid resistor, or bad preamp tube. There's quite a few other things that could cause a hum, but these are some of the more common causes.
Jerry
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