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Vacuum Tube Stereo Microphone Preamp

2017-01-04 18:53  
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Vacuum Tube Stereo Microphone Preamp
This microphone preamplifier is designed to interface a dynamic microphone directly to a computer's sound card input. It can also be used as a mic preamp for analog recorders. The circuit is configured like a mixing board input strip so that each microphone has its own bass and treble cut/boost control. With a larger power supply, this preamp could easily be doubled to provide four channels. The project was inspired by your author's attempts to record live audio using various small solid-state mixing boards with built-in mic preamps. The preamps all produced high levels of hiss and a quieter mic preamp was desired. The hiss problem is multiplied when making a multi-track audio recording since each new track adds to the combined hiss level.