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I know active high and low pass filters are very accurate and generally didn't need a zobel circuit but would a passive high and low pass with a zobel circuit provide a more nature sound than actives or actives the only way to go?

Also for you tube heads I getting into circuitry mainly audio filters, power stabilization and pondering getting into diy amplifier building. I am wondering are there any tube pre amps that can convert high level input to low level output and what type of distortion would be seen at say 6v output Max on the low level line. I ask cause I thought I read around tubes produce distortion regardless a and if the case can it be lower.

Also I was reading about class a/d amplifiers but can locate one or a circuit diagram to compare with a class a and class d to see the implementation of hybrid setup

I know active high and low pass filters are very accurate and generally didn't need a zobel circuit but would a passive high and low pass with a zobel circuit provide a more nature sound than actives or actives the only way to go? Also for you tube heads I getting into circuitry mainly audio filters, power stabilization and pondering getting into diy amplifier building. I am wondering are there any tube pre amps that can convert high level input to low level output and what type of distortion would be seen at say 6v output Max on the low level line. I ask cause I thought I read around tubes produce distortion regardless a and if the case can it be lower. Also I was reading about class a/d amplifiers but can locate one or a circuit diagram to compare with a class a and class d to see the implementation of hybrid setup
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[–] • 0 pt

Tubes add noise when improperly run. If you bias it correctly, it outputs exactly what goes in, except bigger.

If you starve them or overdrive them, they start to add "color" as it's called. Great when you want a fuzz pedal, terrible when you want Bach to sound like Bach.

[–] • 1 pt

exactly why I'm asking for help lol. I don't want to add color only to use them to keep signal HiFi as its converted and let me increase voltage on the outputs by 3.5v maximum.

[–] • 1 pt

100% agree, that's why knowing the intended application is critical.