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I just finished building the Acetylene and i find it's quite noisy, whatever the combination of gain, volume or headroom. I'm not sure a BS170 is a good choice for a low-noise input stage... Anyone has noticed that?

The title almost says it all. I have set the bias so that the signal is greatly attenuated, but I would like to know if there is a more scientific procedure. I have a scope, gen, millivoltmeter. The trimmer is very near the top of its travel. Thanks