Are you a recording engineer looking for better sound? Well according to the following article it could be as simple as swapping out the tubes on your amps. Regular maintenance, swapping out power tubes two or three times a year, can improve what you’re hearing. Don’t be afraid to go on eBay and buy a cheap old model preamp tube to swap out either. Experimenting can give great results.
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Tubes = Tone: Is It Time For Some Guitar Amp TLC ?
There may be apps that do that. You can definitely find spectrum analyzers that will measure ultra low.
Is there an APP that can measure the ultra low frequency levels?
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