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    Building, troubleshooting and testing of these amplifiers should only be
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    the safety precautions around high voltages.

Simple high-pass filter to cut below 20hz

ctechdx

Member
2016-11-16 4:07 am
I'm having some very low hum in a tube preamp. I did some measures with RMAA and I see there's a high peak on very low frequencies... It goes from 15hz and goes high in 10hz.

Is there some simple high-pass filter I can build only for filter this low hum? A 20hz or even a 15hz hp filter would help. How can I do this?