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how much gain do I need for a guitar preamp to drive a line input?

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sam[PS]:
In short :

For the electronic part of the question  : line input should be set around 1dBu, that mean about 0.77V RMS. Output signal of a guitar is between 0.1V and 1.5V. So how much gain do you need : 0.5 to 10. For the input impedance 100K-1Mohm is the norm in almost all pedal/amp.

Now for the sound part "LOT of gain" : if it's about distortion just clone/buy a mxr distortion+ and you should have all you need in there. If you want to use discret transistor, clone a big muff. Want tube ? clone a matchless hotbox... Really no need to reinvent the wheel there.

Just my 2cts...

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