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Microphone valve preamplifier

Based on a Labs project | October 2011 | Find it here
Microphone valve preamplifier
To many hi-fi enthusiasts and musicians, the thermionic valve (electron tube), the sound of a valve amplifier cannot be bettered by that of a solid-state amplifier. To satisfy that conviction, here is a microphone preamplifier based on valves. The circuit in the diagram is intended for use with a studio microphone with or without phantom supply.
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