Post by tracy on Apr 21, 2018 21:31:28 GMT
Hi, I play through a Trace Elliot GP12SMX bass combo amplifier, manufactured in 1994. It is my main amp and is generally very reliable, but over the past year or so, I have noticed that I have been needing to turn the preamp gain knob further and further clockwise to obtain the same level of preamp output, according to the 3-LED display (green, amber, red). It has got to the point where the gain knob now has to be turned almost fully clockwise to even briefly illuminate the red, “overdriven” LED. I should say that I don’t run the amp overdriven, but the red LED used to come on with the gain knob set at much lower levels, so clearly something is wrong.
I have tried cleaning the preamp valve seat, swapping out the valve and applying switch cleaner, but the problem persists. The amp is currently still usable, but I fear over time the problem will continue to worsen to the point where it will run out of headroom on the gain and I will no longer be able to get the sound I want. Can anybody advise, please?
I have tried cleaning the preamp valve seat, swapping out the valve and applying switch cleaner, but the problem persists. The amp is currently still usable, but I fear over time the problem will continue to worsen to the point where it will run out of headroom on the gain and I will no longer be able to get the sound I want. Can anybody advise, please?