Electrical or electronic equipment used to make music louder, characteristically used with electric guitars, but also with other instruments

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How do I know when it's time to change a tube on my amplifier?

I think this would be a wonderfully instructive question to people who are new to tube amplifiers. In short, how do I know that it's time to change a tube, and what's a good strategy for figuring out ...
12
votes
1answer
3k views

What changes in the amp when I adjust its presence?

The tone controls on a guitar amp are pretty obvious, but what does the presence knob affect? It's a subtle effect but can sure make or break a sound. It doesn't seem to be treble or midrange boost, ...
13
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3answers
5k views

Amp picking up radio stations

When I plug my combo practice amp into a normal wall outlet I pick up a local public radio station, just loud enough to be annoying. The only way I've found to reduce it is to plug it into a UPS or ...
13
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7answers
4k views

How do you mic a guitar amp?

How do you go about mic'ing a guitar amp for live performance? Would you do anything different if you were mic'ing the amp for studio recording? Is there anything specific I should look for in a ...
22
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6answers
3k views

Why do tube-based guitar amplifiers sound so good?

Is it just a cultural thing ("they've always sounded that way") or is there some basis in music theory for this?