Here is the B15n schematic for reference: I want to make sure I have loads of clean headroom, so anything that will help that. Is there anything else I need to do to the basic b15n preamp circuit to better work with a peizo?ĥ. ![]() Here is a pic of the small trans that I will be using (tranny on the left):ģ. Rectifier – I want to use a tube rectifier, but I am not sure if the tranny I am using will let me, or what rectifier tube to use. Should I match that, or should I got with something like a 4.7m input resistor like a lot of the peizo preamps I see online.Ģ. Input Resistor – the pickups input resistance is 1m per channel. ![]() I will have a separate notch for each channel that is switched with a small micro switch.ġ. So I want to do a notch filter on each channel that drops 100hz, but leaves everything above about 120hz and below 80hz. Also, when playing at louder volumes, or when the acoustics of a room are terrible, my bass feedsback at about 100hz. I want to make the preamp circuits as close as possible to the original B15n but obviously setup for a piezo. It will have separate volume, treble, and bass controls for each channel, and I will use push/pull tone pots for the bass and treble boost. ![]() My bass has a stereo jack on it, so the preamp will have a single stereo input. What I want to build is an Ampeg b15n based dual channel preamp that I can use to plug into house sound, my regular bass amp, or use to record direct. It came with a preamp that sounded so bad I literally threw it away. I play an upright bass that has a dual piezo pickup.
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