My Custom Shop Nashville 112 steel guitar amp is loud and clear at turn on but volume decreases and distorts while on for an hour.
Do you believe it an internal component issue or could it have been a brown out-power issue?
I started the night out on volume 2 gain on 5, before the show was over I had the gain on 8 and the volume on 6. The amp was sitting facing me right at my left knee. 12" from me.
Custom Shop Nashville 112 low volume issues
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Re: Custom Shop Nashville 112 low volume issues
I'm guessing something is sagging (in the electrical, not the physical, sense) as it warms up.
I'd guess the most likely culprits are the final transistors or maybe something in the power supply
If I were in your shoes, I'd take it to an amp tech, who'd both know which is likely and how to test.
If you have more gear such as another power amp and speaker, I'd do the following to help identify the problem.
Plug a dead cable into the "power amp in" jack, so the 112's power amp and speaker are silent.
Send the "preamp out" to the other power amp and speaker. Play for an hour or two (or hook up a stereo), or however long it took the amp to sag, and see if it remains unaffected. If it doesn't droop, then the problem is in the power amp section.
If you have an infrared thermometer, you could pull the amp out of the cabinet, play until it droops, then look at all the transistors (and maybe the chips) with the thermometer, looking for one hotter than its neighbors.
I'd guess the most likely culprits are the final transistors or maybe something in the power supply
If I were in your shoes, I'd take it to an amp tech, who'd both know which is likely and how to test.
If you have more gear such as another power amp and speaker, I'd do the following to help identify the problem.
Plug a dead cable into the "power amp in" jack, so the 112's power amp and speaker are silent.
Send the "preamp out" to the other power amp and speaker. Play for an hour or two (or hook up a stereo), or however long it took the amp to sag, and see if it remains unaffected. If it doesn't droop, then the problem is in the power amp section.
If you have an infrared thermometer, you could pull the amp out of the cabinet, play until it droops, then look at all the transistors (and maybe the chips) with the thermometer, looking for one hotter than its neighbors.