It is important for Amps to be maintained properly. There are steps that people should take in order for the amp to be kept properly. Check the output tubes and they need to be changed frequently. Filter caps should be replaced periodically and the tube socks need to be maintained well. It is also important to clean the access holes and make sure they are
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GuitarPlayer: 5 Things About Amp Maintenance
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I’m seeking info for sanctuary reverberation absorbsion material ( panels) and best placement.
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?